Publications & Patents
Theses
J. E. Franca — “Switched-Capacitor Systems for Narrow Bandpass Filtering” — Ph.D. Dissertation, University of London — 1985
J. E. Franca — “Active RC Filters with Impedance Converters” — Scientific Review and Research Outlook, Scientific Capacity Examination, Instituto Superior Técnico — 1981
Books, Monographs
U. Seng-Pan; R. P. Martins; J. E. Franca — Design of Very High-Frequency Multirate Switched-Capacitor Circuits — Extending the Boundaries of CMOS Analog Front-End Filtering — Springer — 2005
K. P. Pun; J. E. Franca; C. A. Leme — Circuit Design for Wireless Communication: Improved Techniques for Image Rejection in Wideband Quadrature Receivers — Kluwer Academic Publishers — 2003
W. Ping; J. E. Franca — Multirate Switched-Capacitor Circuits for 2-D Signal Processing — Kluwer Academic Publishers — 1998
J. E. Franca; Y. Tsividis (Editors) — Design of Analog-Digital VLSI Circuits for Telecommunications and Signal Processing — Prentice-Hall — 1994
R. Soin; F. Maloberti; J. E. Franca (Editors) — Analogue-Digital ASICs — Circuit Techniques, Design Tools and Applications — Peter Peregrinus — 1991
M. Ismail; J. E. Franca (Editors) — Introduction to Analog VLSI Design Automation — Kluwer Academic — 1990
Book Chapters
J. E. Franca; C. A. Leme; J. C. Vital — “Analog-to-Digital Conversion” — Wiley Encyclopedia of Electrical and Electronics Engineering — 1999
M. H. Martins; J. E. Franca; A. S. Garção — “Symbolic Methods in Discrete-Time Circuit Design” — Chapter in Symbolic Methods in Analog Circuit Design, IEEE Press — 1998
J. E. Franca; R. P. Martins — “Multirate Switched-Capacitor Filters” — Chapter in Design of VLSI Circuits for Telecommunications and Signal Processing — Prentice-Hall — 1994
J. E. Franca; S. K. Mitra — “Design and Applications of Analogue-Digital Multirate Signal Processing” — Chapter in Fundamentals of Circuits and Systems — IEE — 1994
N. C. Horta; J. E. Franca; C. A. Leme — “Automated High-Level Synthesis of Data Conversion Systems” — Book Chapter — 1991
M. H. Martins; J. E. Franca; A. S. Garção — “Toward High-Level Synthesis of Mixed- Signal Analogue-Digital Integrated Circuits” — Book Chapter — 1991
J. E. Franca; J. C. Vital; C. A. Leme — “Self-Calibrated and Algorithmic Converters” — Book Chapter — 1991
D. Haigh; C. Toumazou; J. E. Franca; B. Singh — “Switched-Capacitor Filters” — Book Chapter — 1991
International Journals
The journal publications reflect a sustained and coherent research trajectory in analog and mixed-signal integrated circuit design, with particular emphasis on switched-capacitor techniques, data converter architectures, and multirate signal processing systems. Spanning foundational theoretical contributions to high-performance CMOS implementations, this body of work has been consistently published in leading international journals, including IEEE Transactions, IEEE Journal of Solid-State Circuits, and the flagship Proceedings of the IEEE.
A defining characteristic of these contributions is the integration of architectural innovation with circuit-level implementation, addressing critical challenges such as precision, programmability, calibration, and power efficiency in data conversion and signal processing. The work also extends into emerging domains, including neural network hardware and computer-aided design methodologies for analog systems.
Collectively, these publications document the evolution of a research agenda that not only advanced the state of the art in analog and mixed-signal design but also contributed to the formation of a strong research school, with lasting impact on both academia and industry.
They represent the consolidation of validated knowledge—transforming architectural concepts and experimental results into widely disseminated scientific foundations that informed subsequent innovations, industrial developments, and ecosystem growth.
2005 — 2000
K. P. Pun; C. S. Choy; C. F. Chan; J. E. Franca — “Current-Division-Based Digital Frequency Tuning for Active RC Filters” — Analog Integrated Circuits and Signal Processing — 2005
K. P. Pun; C. S. Choy; C. F. Chan; J. E. Franca — “An I/Q Mismatch-Free Switched- Capacitor Complex Sigma-Delta Modulator” — IEEE Transactions on Circuits and Systems II — 2004
U. Seng-Pan; R. P. Martins; J. E. Franca — “A 2.5V 57-MHz 15-Tap SC Bandpass Interpolating Filter with 320-MS/s Output” — IEEE Journal of Solid-State Circuits — 2004
K. P. Pun; C. S. Choy; C. F. Chan; J. E. Franca — “Digital Frequency Tuning Technique Based on Current Division for Integrated Active RC Filters” — Electronics Letters — 2003
K. P. Pun; J. E. Franca; C. Azeredo Leme; R. Reis — “Quadrature Sampling Schemes with Improved Image Rejection” — IEEE Transactions on Circuits and Systems II — 2003
K. P. Pun; J. E. Franca; C. Azeredo-Leme; C. F. Chan; C. S. Choy — “Correction of Frequency-Dependent I/Q Mismatches in Quadrature Receivers” — Electronics Letters — 2001
U. Seng-Pan; R. P. Martins; J. E. Franca — “Improved Switched-Capacitor Interpolators with Reduced Sample-and-Hold Effects” — IEEE Transactions on Circuits and Systems II — 2000
1999
K. P. Pun; J. E. Franca; C. Azeredo Leme — “Polyphase SC IIR Hilbert Transformer with Reduced Sensitivity” — Electronics Letters — 1999
K. P. Pun; J. E. Franca; C. Azeredo Leme — “Polyphase SC IIR Hilbert Transformers” — Electronics Letters — 1999
U. Seng-Pan; R. P. Martins; J. E. Franca — “Offset- and Gain-Compensated Mismatch- Free SC Delay Circuit” — Electronics Letters — 1999
1998
J. Goes; J. C. Vital; J. E. Franca — “Optimization of High-Speed Self-Calibrated Pipelined A/D Converters” — IEEE Transactions on Circuits and Systems II — 1998
C. A. Leme; J. Silva; P. Rodrigo; J. E. Franca — “Low-Power CMOS Nine-Channel Detection System with Self-Calibrated Offset” — IEEE Journal of Solid-State Circuits — 1998
U. Seng-Pan; R. P. Martins; J. E. Franca — “Impulse Sampled FIR Interpolation with SC Polyphase Structures” — Electronics Letters — 1998
1997
J. E. Franca; A. Petraglia; S. K. Mitra — “Multirate Analog-Digital Systems for Signal Processing and Conversion” — Proceedings of the IEEE — 1997
W. Ping; J. E. Franca — “CMOS Two-Dimensional Analog Multirate System for Real- Time Image Processing” — IEEE Journal of Solid-State Circuits — 1997
N. C. Horta; J. E. Franca — “Algorithm-Driven Synthesis of Data Conversion Architectures” — IEEE Transactions on Computer-Aided Design — 1997
1996
G. Gielen; J. E. Franca — “CAD for Data Converter Design” — IEEE Transactions on Circuits and Systems II — 1996
A. Almeida; J. E. Franca — “Digitally Programmable Analog Building Blocks for Neural Networks” — IEEE Transactions on Neural Networks — 1996
P. J. Santos; J. E. Franca; J. A. Martins — “Switched-Capacitor Decimators with Ladder and Polyphase Structures” — IEEE Transactions on Circuits and Systems II — 1996
W. Ping; J. E. Franca — “Two-Dimensional Switched-Capacitor Decimating Filters” — IEEE Transactions on Circuits and Systems I — 1996
U. Seng-Pan; R. P. Martins; J. E. Franca — “SC Interpolators without Input Sample-and- Hold Filtering Effect” — Electronics Letters — 1996
1995
J. E. Franca; R. Schaumann — “Synergy Between Continuous-Time and Sampled-Data Analog Filters” — Analog Integrated Circuits and Signal Processing — 1995
M. H. Fino; J. E. Franca; A. S. Garção — “Automatic Symbolic Analysis of SC Networks” — IEEE Transactions on Computer-Aided Design — 1995
R. P. Martins; J. E. Franca — “Cascade Switched-Capacitor Decimators” — IEEE Transactions on Circuits and Systems I — 1995
N. Paulino; J. E. Franca; F. P. Martins — “Programmable CMOS SC Biquad with Algorithmic DACs” — IEEE Journal of Solid-State Circuits — 1995
B. G. Henriques; J. E. Franca — “Steering-Current Multiplying DAC” — Analog Integrated Circuits and Signal Processing — 1995
1994
J. E. Franca — “Integrated Circuit Teaching Through Top-Down Design” — IEEE Transactions on Education — 1994
B. G. Henriques; J. E. Franca — “Programmable CMOS High-Speed Interface with FIR Filtering” — IEEE Journal of Solid-State Circuits — 1994
J. Pratas; J. C. Vital; J. E. Franca — “Pipeline Subranging Analog-to-Digital Video Converter” — Microelectronics Journal — 1994
1993
M. H. Martins; J. E. Franca; A. Steiger-Garção — “Computer-Assisted Analysis of Multirate SC Networks” — Alta Frequenza — 1993
R. P. Martins; J. E. Franca — “Optimum CMOS Switched-Capacitor Anti-Aliasing Filter” — IEEE Journal of Solid-State Circuits — 1993
W. Ping; J. E. Franca — “New Realization of IIR Switched-Capacitor Decimators” — Electronics Letters — 1993
J. Guilherme; F. P. Martins; J. C. Vital; J. E. Franca — “CMOS Analog-Digital Audio Processor for Portable Radiotelephone” — IEEE Journal of Solid-State Circuits — 1993
1992
J. E. Franca; F. Nunes — “Successive Approximation Tuning of Continuous-Time Filters” — Electronics Letters — 1992
J. C. Vital; J. E. Franca — “Programmable Quasi-Passive Algorithmic DAC” — Microelectronics Journal — 1992
R. P. Martins; J. E. Franca — “Second-Order Switched-Capacitor Interpolator” — Electronics Letters — 1992
R. P. Martins; J. E. Franca — “Multistage Multirate SC Architectures for Selective Filtering” — Electronics Letters — 1992
1991
J. E. Franca — “SC Polyphase Decimating Circuits with Reduced Capacitance Spread” — Electronics Letters — 1991
J. E. Franca — “Analogue-Digital Window Comparator with Flexible Programmability” — Electronics Letters — 1991
J. Grilo; J. E. Franca — “Four-Quadrant Multiplier with Sigma-Delta and Multirate Techniques” — Electronics Letters — 1991
J. E. Franca; V. F. Dias — “Design Method for Multiamplifier SC FIR Decimators” — IEE Proceedings G — 1991
1990
C. A. Leme; J. E. Franca — “High-Performance CMOS Comparator for ADCs” — Electronics Letters — 1990
C. A. Leme; J. E. Franca — “Minimum Area Calibration Network for High-Resolution ADCs” — Electronics Letters — 1990
J. C. Vital; J. E. Franca; F. Maloberti — “Integrated Mixed-Mode Digital-Analog Filter Converters” — IEEE Journal of Solid-State Circuits — 1990
J. E. Franca; R. P. Martins — “IIR Switched-Capacitor Decimator Building Blocks” — IEEE Transactions on Circuits and Systems — 1990
1989
J. C. Vital; J. E. Franca — “Capacitance-Ratio-Independent SC DAC” — Electronics Letters — 1989
J. E. Franca; V. F. Dias — “Linear Phase FIR SC Decimators” — Electronics Letters — 1989
1988
V. F. Dias; J. E. Franca; J. C. Vital — “High-Speed Algorithmic SC DAC” — Electronics Letters — 1988
J. E. Franca; S. Santos — “FIR SC Decimators with Active-Delayed Polyphase Structures” — IEEE Transactions on Circuits and Systems — 1988
J. E. Franca — “Multirate SC System for Frequency Division Multiplexing” — Electronics Letters — 1988
J. E. Franca; D. G. Haigh — “Frequency-Translated SC Systems” — IEEE Transactions on Circuits and Systems — 1988
V. F. Dias; J. E. Franca — “Parasitic-Compensated SC Delay Lines” — Electronics Letters — 1988
V. F. Dias; J. E. Franca — “FIR SC Decimators Using Low-Gain Amplifiers” — Electronics Letters — 1988
1985
J. E. Franca — “Single-Path Frequency-Translated SC Bandpass Filter System” — IEEE Transactions on Circuits and Systems — 1985
J. E. Franca — “Non-Recursive Polyphase SC Decimators and Interpolators” — IEEE Transactions on Circuits and Systems — 1985
Refereed International Conferences
The conference publications capture the dynamic and forward-looking dimension of the research activity, serving as a primary vehicle for the rapid dissemination of new ideas, architectural concepts, and experimental results in analog and mixed-signal integrated circuits. Presented at leading international venues—particularly those sponsored by the IEEE, major European conferences, and the flagship IEEE International Solid-State Circuits Conference—these works reflect continuous engagement with the global research community at the highest level.
These contributions often anticipate and complement subsequent journal publications, addressing emerging challenges in data converters, switched-capacitor systems, and mixed-signal integration. They also highlight early explorations of new directions, including design methodologies, calibration techniques, and system-level approaches to signal processing.
Beyond their technical content, the conference proceedings illustrate an active role in shaping the field’s research agenda, fostering collaborations, and mentoring successive generations of researchers in an international context. They served as the front end of dissemination—where emerging ideas were first exposed, validated by the community, and propagated globally, accelerating the transition from concept to recognized direction and enabling rapid alignment across research and industry networks.
1999
A. Gano; J. E. Franca — “New Fully Differential Variable Gain Instrumentation Amplifier Based on a DDA Topology” — IEEE Instrumentation and Measurement Technology Conference — Venice — 1999
U. Seng-Pan; R. P. Martins; J. E. Franca — “Highly Accurate Mismatch-Free SC Delay Circuits with Reduced Finite Gain and Offset Sensitivity” — IEEE International Symposium on Circuits and Systems — Orlando — 1999
U. Seng-Pan; R. P. Martins; J. E. Franca — “High Performance Multirate SC Circuits with Predictive Correlated Double Sampling Technique” — IEEE International Symposium on Circuits and Systems — Orlando — 1999
K. P. Pun; J. E. Franca; C. A. Leme — “Polyphase SC IIR Hilbert Transformers” — IEEE International Conference on Electronics, Circuits and Systems — Cyprus — 1999
J. E. Franca; N. C. Horta; M. Pereira; J. C. Vital; R. Castro-Lopez; M. Delgado-Restituto; F. Fernandez; A. Rodriguez-Vasquez; J. Ramos; P. Santos — “RAPID — Retargetability for Reusability of Application-Driven Quadrature D/A Interface Block Design” — IEEE International Conference on Electronics, Circuits and Systems — Cyprus — 1999
P. Kong-Pan; J. E. Franca; C. A. Leme — “A CMOS IF Stage with Self-Tuned MOSFET-C Filters” — International Symposium on Integrated Circuits, Devices and Systems — Singapore — 1999
1998
N. C. Horta; J. E. Franca — “Exploring Data Conversion Architectures by Symbolic Computation” — IEEE International Symposium on Circuits and Systems — Monterey — 1998
N. F. Garrido; J. E. Franca — “A Continuous-Time Area Detector Servo Demodulator for Hard Disk Drives” — IEEE International Conference on Electronics, Circuits and Systems — Lisbon — 1998
K.-P. Pun; J. E. Franca; C. A. Leme — “Basic Principles and New Solutions for Analog Sampled- Data Image Rejection Mixers” — IEEE International Conference on Electronics, Circuits and Systems — Lisbon — 1998
M. Helfenstein; J. E. Franca; G. Moschytz — “Exact Design of Multirate Switched-Current FIR Filters with Improved Phase Linearity” — IEEE International Conference on Electronics, Circuits and Systems — Lisbon — 1998
J. Guilherme; N. C. Horta; J. E. Franca — “Symbolic Synthesis of Non-Linear Data Converters” — IEEE International Conference on Electronics, Circuits and Systems — Lisbon — 1998
O. Chung-Yuk; J. E. Franca — “Layout Driven Macromodel of an Operational Amplifier” — IEEE International Symposium on Circuits and Systems — Monterey — 1998
U. Seng-Pan; R. P. Martins; J. E. Franca — “A Novel Half-Band SC Architecture for Efficient Analog Impulse Sampled Interpolation” — IEEE International Symposium on Circuits and Systems — Monterey — 1998
R. Neves; J. E. Franca — “Dynamic Element Matching for Time-Interleaved Filters” — IEEE International Symposium on Circuits and Systems — Monterey — 1998
R. Neves; J. E. Franca — “A Switched-Capacitor N-Path Decimating Filter” — IEEE International Symposium on Circuits and Systems — Monterey — 1998
N. F. Garrido; J. E. Franca — “An Auto-Biased CMOS Transconductor for Very High Frequency Applications” — IEEE International Symposium on Circuits and Systems — Monterey — 1998
P. Santos; J. E. Franca — “Switched-Capacitor Interpolator for Direct Digital Frequency Synthesizers” — IEEE International Symposium on Circuits and Systems — Monterey — 1998
1997
N. Garrido; J. E. Franca; J. Kenney — “Comparative Study of Two Adaptive Continuous-Time Filters for Decision Feedback Equalization Read Channels” — IEEE International Symposium on Circuits and Systems — Hong Kong — 1997
R. F. Neves; J. E. Franca; S. K. Mitra; A. Petraglia — “Discrete-Time N-Path Decimating Filters” — IEEE International Symposium on Circuits and Systems — Hong Kong — 1997
U. Seng-Pan; R. P. Martins; J. E. Franca — “Intermittent SC Structures for FIR Rational Interpolation” — IEEE International Symposium on Circuits and Systems — Hong Kong — 1997
C. A. Leme; J. E. Franca — “Analog-Digital Design in Submicrometric Digital CMOS Technologies” — IEEE International Symposium on Circuits and Systems — Hong Kong — 1997
1996
A. J. Correia; J. Guilherme; J. E. Franca — “Current-Mode Algorithmic Pipeline Analog-to-Digital Converter” — IEEE Asia-Pacific Conference on Circuits and Systems — Seoul — 1996
C. Dupuy; J. E. Franca; C. A. Leme; F. Maloberti; R. Rivoir; G. Torelli; Y. Papananos — “ALCD — Analog Libraries on CMOS Digital Process” — IEEE International Conference on Electronics, Circuits and Systems — Rhodes — 1996
U. Seng-Pan; R. P. Martins; J. E. Franca — “New Impulse Sampled IIR Switched-Capacitor Interpolators” — IEEE International Conference on Electronics, Circuits and Systems — Rhodes — 1996
C. A. Leme; L. Fernandes; J. E. Franca — “Programmable IIR Filter Using Bitstream Processing” — IEEE Region 8 Workshop — Pavia — 1996
F. A. Baruqui; A. Petraglia; S. K. Mitra; J. E. Franca — “Efficient IIR Switched-Capacitor Decimators and Interpolators” — European Signal Processing Conference — Trieste — 1996
S. K. Mitra; J. E. Franca — “Mixed Analog-Digital Multirate Signal Processing” — European Signal Processing Conference (Invited Lecture) — Trieste — 1996
W. Ping; J. E. Franca — “Very Compact CMOS SC Multirate 2-D Image Filter” — European Solid- State Circuits Conference — Neuchâtel — 1996
C. Azeredo Leme; J. S. Barreiro; J. E. Franca — “Full 12-Bit Switched-Current Delta-Sigma Modulator with Self-Calibration” — European Solid-State Circuits Conference — Neuchâtel — 1996
U. Seng-Pan; R. P. Martins; J. E. Franca — “Switched-Capacitor FIR Interpolators Without Input Sample-and-Hold Filtering Effect” — Midwest Symposium on Circuits and Systems — Iowa — 1996
P. Dias; J. E. Franca; N. Paulino — “Oscillation Test Methodology for a Digitally Programmable Switched-Current Biquad” — IEEE Mixed-Signal Testing Workshop — Québec — 1996
J. Goes; J. Vital; J. E. Franca — “CMOS 4-Bit MDAC with Self-Calibrated 14-Bit Linearity for Pipelined A/D Converters” — IEEE Custom Integrated Circuits Conference — San Diego — 1996
J. P. Oliveira; J. Vital; J. E. Franca — “Digitally Calibrated Current-Mode Two-Step Flash A/D Converter” — IEEE International Symposium on Circuits and Systems — Atlanta — 1996
P. F. Santos; J. E. Franca — “Switched-Capacitor Bandpass Decimator for High-Frequency Narrowband Channel Filtering and Down Conversion” — IEEE International Symposium on Circuits and Systems — Atlanta — 1996
N. Horta; J. E. Franca — “High-Level Data Conversion Synthesis by Symbolic Methods” — IEEE International Symposium on Circuits and Systems — Atlanta — 1996
D. Rocha; C. Azeredo Leme; J. E. Franca — “Architectures for A/D Conversion with Optimal Use of Oversampling” — IEEE International Symposium on Circuits and Systems — Atlanta — 1996
N. Paulino; J. E. Franca — “CMOS Digitally Programmable Current Multiplier” — IEEE International Symposium on Circuits and Systems — Atlanta — 1996
R. Neves; A. Petraglia; S. Mitra; J. E. Franca — “Mixed Analog-Digital Architecture for High- Frequency Narrow Bandwidth Channel Digitalization” — IEEE International Symposium on Circuits and Systems — Atlanta — 1996
M. Helfenstein; J. E. Franca; G. S. Moschytz — “Design Techniques for HDTV SI Decimators” — European Workshop on Multirate Digital Signal Processing — Hamburg — 1996
1995
J. Goes; J. Vital; J. E. Franca — “Optimizing Power and Area in High-Speed Self-Calibrated Pipelined Data Converters” — NORCHIP Conference — Copenhagen — 1995
J. P. Oliveira; J. Vital; J. E. Franca — “Current-Mode High-Speed A/D Converter for LHC Experiments” — International Workshop on Electronics for LHC Experiments — Lisbon — 1995
J. Goes; J. Vital; J. E. Franca — “High-Speed Self-Calibrated CMOS Pipeline A/D Converters for High-Energy Physics Experiments” — International Workshop on Electronics for LHC Experiments — Lisbon — 1995
W. Ping; J. E. Franca — “Efficient Analog Implementation of Image Compression and Decompression” — International Symposium on IC Technology, Systems and Applications — Singapore — 1995
P. F. Santos; J. E. Franca; R. Schaumann — “Experimental Evaluation of a Tunable VHF Bandpass Gm-C Filter” — International Symposium on IC Technology, Systems and Applications — Singapore — 1995
P. F. Santos; J. E. Franca; R. Schaumann — “100 MHz Narrow-Bandwidth Bandpass GM-C Filter in Digital CMOS Technology” — European Solid-State Circuits Conference — Lille — 1995
1994
J. C. Vital; N. S. Silva; J. E. Franca — “Automatic Non-Linearity Signature Analysis of Data Converters” — IEE International Conference on Advanced A-D and D-A Conversion Techniques — Cambridge — 1994
J. C. Vital; N. S. Silva; N. E. Franca; M. A. Lança; J. Goes; J. E. Franca — “Automatic Synthesis of Modular High-Speed Data Conversion Architectures and Functional Building Blocks” — IEE International Conference on Advanced A-D and D-A Conversion Techniques — Cambridge — 1994
J. Goes; J. E. Franca; N. Paulino; J. Grilo; G. Temes — “High-Linearity Calibration of Low- Resolution Digital-to-Analog Converters” — IEEE International Symposium on Circuits and Systems — London — 1994
J. P. Carreira; J. E. Franca — “High-Speed CMOS Current Comparators” — IEEE International Symposium on Circuits and Systems — London — 1994
N. C. Horta; J. E. Franca — “Methodology for Automatic Generation of Data Conversion Topologies from Algorithms” — IEEE International Symposium on Circuits and Systems — London — 1994
J. Guilherme; J. E. Franca — “Digitally-Controlled Analog Signal Processing and Conversion Using a Logarithmic Building Block” — IEEE International Symposium on Circuits and Systems — London — 1994
W. Ping; J. E. Franca — “Switched-Current Multirate Filtering” — IEEE International Symposium on Circuits and Systems — London — 1994
A. P. Almeida; J. E. Franca — “Digitally Programmable Analog Cells for Artificial Neural Networks” — IEEE Custom Integrated Circuits Conference — San Diego — 1994
1993
A. Almeida; J. E. Franca — “Mixed-Mode Architecture for Analog Neural Networks with Digital Programmability” — International Joint Conference on Neural Networks — Nagoya — 1993
J. E. Franca; S. K. Mitra; A. Petraglia — “Integrated Bandpass Analog-to-Digital Interface Systems: Options and Risks” — International Conference on Microelectronics — Dhahran — 1993
J. C. Vital; J. E. Franca — “High-Speed A/D-D/A Conversion System with Flexible Testing Capabilities” — International Conference on VLSI Design — Bombay — 1993
J. C. Vital; N. C. Horta; N. S. Silva; J. E. Franca — “CATALYST: CAD Tool for Architecture-Level Design and Analysis of Data Converters” — EDAC-EUROASIC — Paris — 1993
F. P. Martins; J. E. Franca; N. Paulino — “Charge Programming Techniques for SC Biquads” — IEEE International Symposium on Circuits and Systems — Chicago — 1993
W. Ping; J. E. Franca — “Switched-Capacitor Polyphase Structures for Two-Dimensional Analog Filtering” — IEEE International Symposium on Circuits and Systems — Chicago — 1993
F. Nunes; J. E. Franca — “Continuous-Time Leapfrog Filter with Precise Successive Approximation Tuning” — IEEE International Symposium on Circuits and Systems — Chicago — 1993
J. E. Franca; S. K. Mitra; A. Petraglia — “Recent Developments and Future Trends of Multirate Analog-Digital Systems” — IEEE International Symposium on Circuits and Systems — Chicago — 1993
B. G. Henriques; J. E. Franca — “High-Speed D/A Conversion with Linear Phase Sinx/x Compensation” — IEEE International Symposium on Circuits and Systems — Chicago — 1993
J. C. Vital; J. E. Franca — “Concurrent Two-Step Flash Analog-to-Digital Conversion Architecture” — IEEE International Symposium on Circuits and Systems — Chicago — 1993
J. C. Vital; J. E. Franca; N. S. Silva — “Fully Digital Testability of a High-Speed Conversion System” — IEEE International Symposium on Circuits and Systems — Chicago — 1993
European Solid-State Circuits Conference contribution — Seville — 1993 (title preserved in master list; already included once — not duplicated here)
1992
B. G. Henriques; J. E. Franca — “High-Speed Interface Building Block for Analogue-Digital VLSI Systems” — IEEE Asia-Pacific Conference on Circuits and Systems — Sydney — 1992
M. H. Martins; J. E. Franca; A. S. Garção — “Computer-Assisted Tool for Designing Multirate SC Networks by Symbolic Signal Flow Graphs” — International Workshop on Symbolic Methods for Analogue Circuit Design — Florence — 1992
J. E. Franca — “Using Design Tools to Teach” — EUROCHIP Workshop on VLSI Design Training — Grenoble — 1992
M. H. Martins; J. E. Franca; A. S. Garção — “Symbolic z-Transfer Function Generator for Multirate SC Networks” — IEEE International Symposium on Circuits and Systems — San Diego — 1992
N. C. Horta; J. E. Franca — “Automatic Multi-Level Macromodel Generation for Data Conversion Systems” — IEEE International Symposium on Circuits and Systems — San Diego — 1992
J. C. Vital; J. E. Franca — “Synthesis of High-Speed A/D Converter Architectures with Flexible Simulation” — IEEE International Symposium on Circuits and Systems — San Diego — 1992
1991
V. F. Dias; J. E. Franca — “Programmable FIR Switched-Capacitor Decimators” — IEEE International Symposium on Circuits and Systems — Singapore — 1991
C. A. Leme; J. E. Franca — “Efficient Calibration of Binary-Weighted Networks Using a Mixed Analog-Digital RAM” — IEEE International Symposium on Circuits and Systems — Singapore — 1991
C. A. Leme; J. E. Franca — “Error Detection and Analysis in Self-Testing Data Conversion Systems Employing Charge-Redistribution Techniques” — IEEE International Symposium on Circuits and Systems — Singapore — 1991
R. P. Martins; J. C. Vital; F. P. Martins; J. Guilherme; C. Neta; E. Alverca; J. E. Franca — “CMOS Analogue-Digital Integrated Circuit for Portable Radiotelephones” — Mideuropean Custom Circuits Conference — Budapest — 1991
C. A. Leme; J. E. Franca — “20 μs 16-Bit Successive Approximation CMOS Analogue-Digital Converter” — Mideuropean Custom Circuits Conference — Budapest — 1991
1990
J. E. Franca — “Multirate Switched-Capacitor Signal Processing for Communications Applications” — URSI General Assembly — Prague — 1990
J. E. Franca; J. C. Vital — “Low-Cost CMOS Algorithmic Digital-Analogue Converter for High- Frequency Applications” — IEEE Custom Integrated Circuits Conference — Boston — 1990
R. P. Martins; J. E. Franca — “Infinite Impulse Response Switched-Capacitor Interpolators with Optimum Implementation” — IEEE International Symposium on Circuits and Systems — New Orleans — 1990
J. C. Vital; J. E. Franca — “Analogue-Digital Echo Canceller Based on the DAFIC Building Block” — IEEE International Symposium on Circuits and Systems — New Orleans — 1990
1989
R. P. Martins; J. E. Franca — “Architecture Compilation of Multistage IIR Switched-Capacitor Decimators” — International Workshop on Integrated Circuit Design — Huelva — 1989
C. A. Leme; J. E. Franca; J. P. Montalvão; A. P. Abrantes — “Architecture Compilation of Successive Approximation Capacitive-Array A/D Converters” — International Workshop on Integrated Circuit Design — Huelva — 1989
C. C. Pinto; S. P. Bruçó; J. E. Franca — “Analogue-Digital Tone Detector Circuit for Telephone Applications” — International Workshop on Integrated Circuit Design — Huelva — 1989
J. C. Vital; J. E. Franca — “Cancellation of Echo Signals in the Digital Subscriber Loop Using Novel Analogue-Digital IC Techniques” — International Workshop on Integrated Circuit Design — Huelva — 1989
J. E. Franca — “Present Role and Future Trends of Analogue Design Automation” — ESPRIT Conference — Brussels — 1989
J. E. Franca — “Switched-Capacitor Filters and Multirate Building Blocks” — European Conference on Circuit Theory and Design — Brighton — 1989
J. C. Vital; J. E. Franca; F. Maloberti — “Design and Evaluation of an Integrated Digital-Analogue Filter Converter” — European Solid-State Circuits Conference — Vienna — 1989
C. A. Leme; J. E. Franca — “High-Resolution Self-Calibrating Analogue-Digital Converters — Overview and Novel Solutions” — International Symposium on Signals, Systems and Electronics — Erlangen — 1989
J. E. Franca; R. Schaumann — “High-Frequency Integrated Signal Processing Combining SC and Continuous-Time Networks” — International Conference on Circuits and Systems — Nanjing — 1989
R. P. Martins; J. E. Franca — “CMOS Switched-Capacitor Video Decimator with Sampling Rate Reduction” — IEEE Custom Integrated Circuits Conference — San Diego — 1989
R. P. Martins; J. E. Franca — “Nth-Order IIR SC Decimator Building Block with Optimum Implementation” — IEEE International Symposium on Circuits and Systems — Portland — 1989
1988
C. A. Leme; J. E. Franca; F. Maloberti; M. S. Piedade — “Multiplexed A/D Converter with Self- Testing Capability” — European Solid-State Circuits Conference — Manchester — 1988
V. F. Dias; J. E. Franca — “Comparative Study of FIR SC Decimator Structures for High- Frequency Applications” — Midwest Symposium on Circuits and Systems — St. Louis — 1988
J. C. Vital; J. E. Franca; C. A. Leme — “Switched-Capacitor Digital-Analogue Converters with Built-In FIR Filtering” — IEEE International Symposium on Circuits and Systems — Helsinki — 1988
R. P. Martins; J. E. Franca — “Multistage IIR SC Bandpass Decimator for Voiceband Interface Systems” — IEEE International Symposium on Circuits and Systems — Helsinki — 1988
1987
J. E. Franca; V. F. Dias — “FIR Switched-Capacitor Decimator Circuits with Time-Shared Amplifiers” — Midwest Symposium on Circuits and Systems — Syracuse — 1987
J. E. Franca — “Switched-Capacitor FDM System with Decimation and Interpolation Techniques” — Midwest Symposium on Circuits and Systems — Syracuse — 1987
J. E. Franca; D. G. Haigh — “Optimum Implementation of IIR SC Decimators” — IEEE International Symposium on Circuits and Systems — Philadelphia — 1987
1986
J. E. Franca — “Switched-Capacitor Decimators and Interpolators with Biquad-Polyphase Structures” — Midwest Symposium on Circuits and Systems — Lincoln — 1986
1985
J. E. Franca — “Switched-Capacitor Bandpass Filter Systems with Very Narrow Relative Bandwidth” — European Conference on Circuit Theory and Design — Prague — 1985
J. E. Franca — “Single-Path Frequency-Translated Switched-Capacitor System for Filtering and SSB Generation/Detection” — IEEE International Symposium on Circuits and Systems — Kyoto — 1985
1984
J. E. Franca — “Decimators and Interpolators for Narrowband SC Bandpass Filter Systems” — IEEE International Symposium on Circuits and Systems — Montreal — 1984
1983
J. E. Franca; D. G. Haigh — “Harmonic Distortion in Two-Quadrant Multiplier Integrators Due to Early Voltage Effect” — IEEE International Symposium on Circuits and Systems — Newport Beach — 1983
Scientific and Technical Project Reports
The scientific and technical reports represent the operational core of a sustained effort to translate advanced research into engineered reality. Produced across industrial settings, national programs, and major European initiatives—notably within frameworks such as ESPRIT—these documents capture the discipline of execution: from architectural definition and system specification to prototype realization, validation, and performance benchmarking.
More than technical records, these reports functioned as instruments of coordination and delivery in complex, multi-partner environments. They reflect leadership in structuring projects, aligning international teams, and ensuring that ambitious objectives were converted into measurable outcomes. In this context, the work spans the full innovation continuum—from early industrial developments at EDP to the orchestration of large-scale European R&D efforts.
Fundamentally, this body of work reveals a distinctive capability: the ability to bridge vision and implementation at scale. By embedding rigorous design methodologies within collaborative frameworks, these reports contributed to the development of lasting research capacity, the advancement of technological readiness, and the positioning of integrated circuit design within a broader European innovation agenda.
Critically, they also formed the backbone of downstream impact—underpinning high-level scientific publications, enabling advanced prototypes and demonstrators, and contributing to the emergence of industrial ventures and a globally connected semiconductor ecosystem. In this role, they anchored the transition from design to implementation—ensuring that concepts were engineered, validated, and transferred into tangible systems, capabilities, and long-term institutional and industrial outcomes.
1999
J. C. Vital; J. Guilherme; J. E. Franca — “Deliverables Month 9” — Project MIXMODEST, ESPRIT Project 29261 — July 1999
J. C. Vital; J. Guilherme; J. E. Franca — “Deliverable D1.2.3” — Project MIXMODEST, ESPRIT Project 29261 — July 1999
1998
J. C. Vital; J. E. Franca — “Deliverable D1.1.1, D1.1.2” — Project MIXMODEST, ESPRIT Project 29261 — December 1998
1996
J. C. Vital; J. E. Franca — “Final Evaluation on DACs for DDS for Radio” — Project AMFIS, ESPRIT 8795, Deliverable 4.2.B — December 1996
J. C. Vital; J. E. Franca — “Final Evaluation of Radio Front-End ADCs” — Project AMFIS, ESPRIT 8795, Deliverable 3.5.B — December 1996
J. C. Vital; J. E. Franca — “Filters Evaluation Final Version” — Project AMFIS, ESPRIT 8795, Deliverable 2.1.B — December 1996
J. E. Franca; C. Goutis; F. Maloberti; J. L. Huertas — “Activities Report” — Project MEDCHIP, ESPRIT III Project 8010 — December 1996
J. E. Franca; C. A. Leme; D. M. Santos — “Relatório de Actividades e Resultados” — Project ACTIX, JNICT — June 1996
J. E. Franca; D. M. Santos — “Relatório de Actividades e Resultados” — Project PHENIX, JNICT — June 1996
J. E. Franca — “Relatório Final de Progresso” — Project PUZZLE, JNICT — March 1996
1995
J. E. Franca — “Relatório de Actividades e Resultados” — Project PUZZLE, JNICT — May 1995
1994
J. E. Franca — “Primeiro Relatório de Progresso” — Project CHIPPHY, JNICT — March 1994
J. E. Franca — “Primeiro Relatório de Progresso” — Project PUZZLE, JNICT — February 1994
J. E. Franca — “Final Report” — Project AD2000, ESPRIT II Project 5056 — January 1994
J. E. Franca — “Terceiro Relatório de Progresso” — Project INTERFACE, JNICT — January 1994
J. E. Franca; F. Maloberti; J.-L. Huertas — “Final AD2000 Project Report” — Project AD2000, ESPRIT II Project 5056 — January 1994
J. C. Vital; J. E. Franca — “Specifications and Architecture Selection DAC for DDS for Radio” — Project AMFIS, ESPRIT 8795, Deliverable 4.2.A — April 1994
J. C. Vital; J. E. Franca — “First Specifications of the Filters Analog Pre and Post Processing Filters” — Project AMFIS, ESPRIT 8795, Deliverable 2.1.A — April 1994
1993
J. E. Franca; F. Maloberti; J.-L. Huertas — “Sixth Progress Report for the period from 93.04.16 to 93.10.15” — Project AD2000, ESPRIT II 5056 — November 1993
J. E. Franca; F. Maloberti; J.-L. Huertas — “Fifth Progress Report for the period from 92.10.16 to 93.04.15” — Project AD2000, ESPRIT II 5056 — May 1993
J. E. Franca — “Segundo Relatório de Progresso” — Project INTERFACE, JNICT — May 1993
P. Graal et al. — “User Programmable Integrated Circuits — 2nd Quarterly Progress Report” — EUCLID/CEPA 2 RTP 2.9 — June 1993
P. Graal et al. — “User Programmable Integrated Circuits — 3rd Quarterly Progress Report” — EUCLID/CEPA 2 RTP 2.9 — September 1993
P. Graal et al. — “User Programmable Integrated Circuits — Quarterly Progress Report” — EUCLID/CEPA 2 RTP 2.9 — December 1993
J. C. Vital; J. Goes; J. Santos; J. E. Franca — “IC Prototype of a State-of-the-Art Two-Step Flash Converter” — AD2000 Deliverable SD_121 — December 1993
J. Santos; P. Santos; J. C. Vital; J. Goes; J. E. Franca — “Prototype Board of a 10b 10 MHz Dual- Mode Conversion System” — AD2000 Deliverable SD_123_A — December 1993
J. Goes; J. E. Franca; J. C. Vital — “Architecture Level Design and Simulation of a 15b 15 MHz A/ D Converter” — AD2000 Deliverable SD_123_B — December 1993
B. G. Henriques; J. E. Franca — “IC Prototype of a State-of-the-Art 8b 75 MHz Steering Current DAC” — AD2000 Deliverable SD_132_B — December 1993
B. G. Henriques; J. E. Franca — “IC Prototype 8b 75 MHz DAC with Embedded Programmable Filtering Functions” — AD2000 Deliverable SD_133_B — December 1993
J. C. Vital; N. S. Silva; J. E. Franca — “Development of Behavioral Models and Dedicated Simulation Routines” — AD2000 Deliverable DT_222 — December 1993
J. C. Vital; N. S. Silva; J. E. Franca — “CATALYST: Architecture-Level Design Tool” — AD2000 Deliverable DT_23_B — December 1993
J. C. Vital; J. E. Franca — “Conceptual Foundations of Dual-Mode Two-Step Flash Converters” — AD2000 Deliverable TR_322 — December 1993
B. G. Henriques; J. E. Franca — “Foundations on Steering-Current DAC Architectures” — AD2000 Deliverable TR_323_B — December 1993
J. C. Vital; J. E. Franca — “Architecture-Level Design of a Video Range Conversion System” — AD2000 Deliverable TR_33_B — December 1993
J. C. Vital; N. S. Silva; J. E. Franca — “NLyzer: A Non Linearity Analyzer” — AD2000 Deliverable TR_422 — December 1993
1992
J. E. Franca; F. Maloberti; J.-L. Huertas — “Fourth Progress Report for the period from 92.04.15 to 92.10.15” — Project AD2000, ESPRIT II 5056 — November 1992
J. E. Franca; F. Maloberti; J.-L. Huertas — “Third Progress Report for the period from 92.04.15 to 92.10.15” — Project AD2000, ESPRIT II 5056 — May 1992
N. C. Horta; J. E. Franca — “Architecture Synthesis, Macromodeling and Behavioral Simulation of Data Converters Based on Charge-Redistribution Techniques — Final Report” — Project ADCIS, ESPRIT II 2193 — January 1992
1991
J. C. Vital; J. E. Franca — “State-of-the-Art Overview of Analogue-Digital and Digital-Analogue Converters” — AD2000 Deliverable TR_001 — May 1991
R. P. Martins; J. E. Franca — “Primeiro Relatório de Progresso” — Project INTERFACE, JNICT — December 1991
J. E. Franca; F. Maloberti; J.-L. Huertas — “Second Progress Report for the period from 92.04.15 to 92.10.15” — Project AD2000, ESPRIT II 5056 — November 1991
J. P. Montalvão; A. P. Abrantes; J. E. Franca — “Automatização de Processos para a Realização de Filtros RC-Activos em Tecnologia de Filme Espesso — Relatório Final” — Project MIC/87/373, JNICT — June 1991
J. E. Franca; F. Maloberti; J.-L. Huertas — “First Progress Report for the period from 91.10.15 to 92.04.15” — Project AD2000, ESPRIT II 5056 — May 1991
1990
C. A. Leme; N. C. Horta; J. E. Franca — “Menu Driven Operation of a Successive Approximation A/D Converter Compiler — Progress Report” — Project ADCIS, ESPRIT II 2193 — December 1990
C. A. Leme; J. E. Franca — “Design and Evaluation of a CMOS Self-Calibrated 20μs 16-Bit Analogue-to-Digital Converter” — IST Research Report for Austria Mikro Systeme — May 1990
1987
J. P. Vital; C. A. Leme; J. E. Franca — “Switched-Capacitor DAFIC — A New Concept for Analogue-Digital Conversion and Filtering” — CEAUTL Research Report for British Telecom — June 1987
C. A. Leme; J. E. Franca — “A Switched-Capacitor System with Multiplexed Analogue-Digital and Digital-Analogue Conversion Functions” — CEAUTL Research Report for British Telecom — June 1987
R. P. Martins; J. E. Franca — “A Multistage Switched-Capacitor Bandpass Decimator for a Voiceband Analogue Interface System” — CEAUTL Research Report for British Telecom — June 1987
J. E. Franca; C. A. M. Leme — “Evaluation of the TSGF08006A Switched-Capacitor Lowpass Filter for a V.32 Modem” — Technical Report — July 1987
1986
J. E. Franca; C. A. M. Leme — “Analogue Filtering and Tone Detection for a V.32 Modem” — CEAUTL Research Report for British Telecom — July 1986
J. E. Franca; C. A. M. Leme; R. P. Martins — “An LSI Analogue Front-End for a V.32 Modem” — CEAUTL Research Report for British Telecom — December 1986
1984
J. E. Franca — “Improved Decimators and Interpolators for Narrowband Switched-Capacitor Bandpass Filter Systems” — Imperial College Report for British Telecom — April 1984
1983
J. E. Franca — “Frequency-Translated Switched-Capacitor Filter Systems” — Imperial College Report for British Telecom — December 1983
J. E. Franca — “Design and Evaluation of a Discrete Component Switched-Capacitor Bandpass Filter System” — Imperial College Report for British Telecom — August 1983
J. E. Franca — “Techniques for Sampling Rate Alteration in Switched-Capacitor Bandpass Filter Systems” — Imperial College Report for British Telecom — July 1983
J. E. Franca — “Parasitic Insensitive Switched-Capacitor Biquads” — Imperial College Report for British Telecom — June 1983
D. G. Haigh; B. Singh; J. E. Franca — “Filters for State-of-the-Art Microelectronic Fabrication” — Imperial College Report for AUWE — May 1983
1982
J. E. Franca — “Evaluation of the MOSTEK MK5912 and the HARRIS HC5512 Switched- Capacitor PCM Transmit Filters” — Imperial College Report for British Telecom — November 1982
J. E. Franca; D. G. Haigh — “A Theoretical and Practical Study of Fukahori’s Approach to the Design of Continuous-Time Monolithic Filters” — Imperial College Report for AUWE — September 1982
1981
J. E. Franca — “Estudo sobre a Viabilidade de Realização de Filtros Activos de Alta Qualidade para o Múltiplo Aproveitamento do Canal Telefónico Nominal” — Relatório 388/81, Laboratório Central da EDP — July 1981
J. E. Franca — “Projecto Preliminar de um Filtro RC-Activo de Canal Telefónico para a Banda 28– 32 KHz” — Relatório Interno CEAUTL — January 1981
1980
J. E. Franca — “Sistema Electrónico para Transferência de Chamadas Telefónicas Locais” — Relatório 560/80, Laboratório Central da EDP — October 1980
J. E. Franca — “A Non-Conventional Technique for Half-Wave Rectifier Circuits” — CEAUTL Internal Report — September 1980
J. E. Franca — “Contador de Dígitos de Marcação” — Relatório 409/80, Laboratório Central da EDP — April 1980
1979
J. E. Franca — “Estudo de um Filtro Activo de Realimentação Múltipla para Sistemas de Comunicação por PCM” — Relatório Interno do CEAUTL — August 1979
Various
J. E. Franca — “A Capability Build-up Program on Analog-Digital Integrated Circuits and Systems” — Chinese University of Hong Kong — 1997
Relatório de Avaliação Internacional do Instituto de Telecomunicações — International Evaluation Report — 1996
J. E. Franca; L. Alcácer; M. I. Simas (Editors) — “Annual Report 1995” — Centro de Microssistemas, IST — 1995
J. E. Franca; L. Alcácer; M. I. Simas (Editors) — “Annual Report 1994” — Centro de Microssistemas, IST — 1994
J. E. Franca (Editor) — “Annual Report 1993” — Grupo de Circuitos e Sistemas Integrados, IST — 1993
J. E. Franca; C. Goutis; F. Maloberti; J.-L. Huertas — “Catch-Up Action for Industry-Oriented Microelectronics Training Enhancement in Greece, Italy, Portugal and Spain — Motivation, Strategies and Programme Overview” — MEDCHIP / ESPRIT Working Group 7307 — 1993
J. E. Franca (Editor) — “Annual Report 1991/92” — Grupo de Circuitos e Sistemas Integrados, IST — 1992
A. Gano; J. E. Franca; J. T. Castro — “Aplicações Não Convencionais da Tecnologia Híbrida de Camada Espessa” — Sessões Técnicas ENDIEL — 1991
J. E. Franca — “Relatório de Visita de Estudo apresentado à Comissão do Programa Erasmus” — Erasmus Programme — 1990
Patents
The patent portfolio represents the decisive step where invention is formalized into protected, transferable technology. Emerging from sustained work in analog and mixed-signal integrated circuit design, these patents—filed with institutions such as the Ministry of Defence and British Telecom, and granted through authorities including the United States Patent and Trademark Office—capture solutions to fundamental challenges in data conversion, signal processing, and system integration.
More than discrete technical achievements, these patents reflect a deliberate strategy to bridge research and industrial value. They encode design knowledge into proprietary assets, enabling replication, scaling, and deployment within competitive environments. In doing so, they translate architectural insight and circuit innovation into tangible instruments of technology transfer.
Within the broader innovation trajectory, the patents mark the point of codification and ownership—where validated ideas are secured, positioned for commercialization, and leveraged to support industrial partnerships, product development, and the emergence of sustainable semiconductor ventures and ecosystems.
British Patent Application 8511218 (1985) – “Switched-Capacitor Circuits,” Ministry of Defense (U.K.).
British Patent Application 8813163.6 (1988) – “Converting Between Analogue and Digital Quantities,” British Telecom (U.K.).
United States Patent 5,008,674 (1991) – “Digital-Analogue Converter with Switched- Capacitor and Transverse Filter,” co-authored with J.C. Vital and C.A. Leme.
FI/08.11.96/FI 964497 (1996) – “Improved Method and Circuit Arrangement for Processing Signal,” co-authored with J. Rapeli, J.C. Vital, C.A. Leme, J. Bello, P. Lopes, and R. Reis.
U.S. Patent Application – “Integrated Audio Mixer,” co-authored with C.A. Leme and C. Dupuy.