Professor Godi Fischer

Ph.D. Swiss Federal Institute of Technology, 1985
M.S. Swiss Federal Institute of Technology, 1978

In the early 1980's, Dr. Fischer has been funded to do research in the field of switched-capacitor (SC) circuits. This work bas been reflected in articles such as "On the Frequency Limitations of SC Filters", IEEE JSSC, Aug. 1984, or "SC Filters for High-Frequencies with Compensation for Finite Amplifier Gain", IEEE Trans. CAS, Aug. 1985. Since then, his research interest have expanded from analog integrated filters to amplifiers, data converters and analog/digital CMOS circuits. Some of his most recent articles are "A Programmable Temperature Monitoring Device for Tagging Small Fish - A Prototype Chip Development", IEEE Trans. on VLSI Systems, 1997, or "Alternative Topologies for Sigma-Delta Modulators - A Comparative Study", IEEE Trans. on CAS II, 1997.

Research Interests

• Electronics
• Signal Processing
• Integrated Circuit Design
• VLSI

Courses taught

• ELE432 Solid-state Devices
• ELE444 Advanced Electronic Design
• ELE447 Digital Integrated Circuit Design
• ELE537 Digital Integrated Circuit Design II
• ELE539 Analog Integrated Circuit Design

Contact Information

# 214 Kelley Hall,4 East Alumni Ave,
Kingston, RI 02881-0805,USA.
Tel. (401) 874-5879
Fax. (401) 782-6422
Email: fischer@ele.uri.edu

Published Conference Papers:

• G. Fischer, and J. U. Varchmin: Sigma-Delta A/D Umsetzer - Prinzip und Eigenschaften. 127. Helmholtz Seminar der PTB zum Thema Qualitätssicherung für Analog-Digital Umsetzer, Berlin, Nov. 7-8, 1995.
  
  
• G. Fischer, and A. J. Davis: A Sigma-Delta Architecture for Wide Bandwidth Applications. IEEE Proc. of ISCAS'96, Vol. I, pp. 25-28, Atlanta, GA, May 12-15, 1996.
  
  
• G. Fischer, J. C. Daly, C. W. Recksiek. K. D. Friedland and C. Yang: Design of a Programmable Temperature Monitoring Device for Tagging small Fish. IEEE Proc. of ISLPED'96, pp. 319-322, Monterey, CA, Aug. 12-14, 1996.
  
  
• A. J. Davis, and G. Fischer: A Two-Stage Sixth-Order Sigma-Delta ADC with 16-bit Resolution Designed for an Oversampling Ratio of 16. IEEE Proc. of MWSCAS'96, pp. 230-233 Ames, IO, Aug. 19-21, 1996.
  
  
• G. Fischer, and N. K. Modadugu: Design of a Compact Direct Digital Frequency Synthesizer (DDFS) with 12-bit Amplitude and 32-bit Frequency Resolution. VLSI Signal Processing IX, pp. 75-82, IEEE Press (ASSP Society), November 1996.
  
  
• M. Helfenstein, A. Muralt, G. Fischer, P. Zbinden, D. Pfaff, F. Frey, and G. S. Moschytz: SC and SI Filters in Baseband Applications - A Comparison,' Proc. of IEEE ISCAS'97, Hong Kong, June 9-12, 1997.
  
  
• A. J. Davis, and G. Fischer: DelSi - A Design and Simulation Tool for Delta-Sigma Modulator, Proc. of the XIV IMEKO World Congress, 'Workshop on ADC Modeling', Tampere, Finland, June 1-6, 1997.
  
  
• G. Fischer, J. C. Daly, C. W. Recksiek, and K. D. Friedland: A Programmable Temperature Monitoring Device for Tagging small Fish - A Prototype Chip Development. IEEE Trans. on VLSI Systems, Vol. 05/04, pp.401-407, Dec. 1997.
  
  
• G. Fischer, J. C. Daly, C. W. Recksiek. K. D. Friedland, B. Watkins, S. Lee, and D. Hyun: A Programmable Data Logging Device for Fish Habitat Observation. Proc. of CMOC'98, Hartford, CT, March 24, 1998.
  
  
• A. J. Davis, and G. Fischer: Digital Correction of Non-Ideal Amplifier Effects in the MASH Modulator, IEEE ISCAS'98, Monterey, CA, May 31 - June 3, 1998.
  
  
• A. J. Davis, G. Fischer, H-H. Albrecht, and J. Hess: A 2-Stage 6th order Delta-Sigma Modulator with Digital Correction for Finite Amplifier Gain & C-Ratio Matching Error. X IMEKO TC-4 Symposium, 3rd Workshop on ADC Modeling and Testing, Naples, Italy, Sept.17-18, 1998.
  
  
• A. J. Davis, and G. Fischer: Performance Limitations of Switched-Capacitor Delta-Sigma Analog-to-Digital Converters. X IMEKO TC-4 Symposium, 3rd Workshop on ADC Modeling and Testing, Naples, Italy, Sept.17 - 18, 1998.
  
  
• G. Fischer, and D. Hyun: Limit Cycles in Single-Stage Delta-Sigma Modulators. IEEE Proc. of ISCAS'99, pp. II-376-II-379, Orlando, FL, May 30 - June 2, 1999.
  
  
• A. J. Davis, and G. Fischer: Performance Limitations of Switched-Capacitor Delta-Sigma Analog-to-Digital Converters. Proc. of 4th Workshop on ADC Modeling and Testing, pp. 21-26, Bordeaux, France, Sept. 9-10, 1999.
  
  
• A. J. Davis, G. Fischer, H-H. Albrecht, and J. Hess: Digital Correction of Analog Circuit Imperfections in the 1-1-1 Cascaded Delta-Sigma Modulator. Proc. of 4th Workshop on ADC Modeling and Testing, pp. 153-158, Bordeaux, France, Sept. 9-10, 1999.
  
  
• A. J. Davis, G. Fischer, H-H. Albrecht, and J. Hess: Digital Correction of Circuit Imperfections in cascaded Delta-Sigma Modulators composed of first-order Sections. IEEE Proc. of ISCAS'00, pp. V 689-692, Geneva, May 28 - 31, 2000.
  
  
• G. Fischer, and A. J. Davis: VLSI Implementation of a Wide-Band Sonar Receiver. IEEE Proc. of ISCAS'00, pp. V 673-676, Geneva, May 28 - 31, 2000
  
  
• G. Fischer, and C. T. Weibel: Delay-Sum Beamforming using Delta-Sigma modulated Inputs. IEEE MWSCAS'00, Lansing, MI, August 8 - 11, 2000.
  
  
• G. Fischer, and D. Hyun: Quantization Noise and Limit Cycle Patterns in Single-Bit Delta-Sigma Modulators. IEEE Proc. of IMTC'01, Budapest, Hungary, May 21 - 23, 2001.
  
  
• G. Fischer, and D. Hyun: Delta-Sigma Modulator Topologies with high Immunity to Pattern Noise. IEEE Proc. of ISCAS'02, pp. III 703-706, Scottsdale, AZ, May 26 - 29, 2002.
  
  
• A. J. Davis, and G. Fischer: Improved Null Cancellation in a sixth order Delta-Sigma Modulator realized with 2 third-order Sections. To be presented at ADDA&EWADC'02, Prag, Czech Republic, June 2002.
  
  
• S. Lee, G. Fischer, and M. Obara: an Acoustic Tag for long Range Fish Tracking in the Ocean. To be presented at US-Korea Conf. on Science, Technology and Entrepreneurship, Seoul, Korea, July 2002.
  
  
• M. Obara, G. Fischer, and S. Lee: A monolithic Time of Arrival Detector for acoustic Signals, To be presented at IEEE MWSCAS'02, Tulsa, OK, August 4 - 7, 2002.
  
  
• G. Fischer, S. Lee, and M. Obara: A Programmable monolithic Temperature Logging Device, To be presented at IEEE MWSCAS'02, Tulsa, OK, August 4 - 7, 2002.
  
  
• W. Yung, T. Xia, G. Fischer, and A. J. Davis: Process Dependency of MOSFET depletion Mode MOS Capacitors in Series Compensation, To be presented at IEEE MWSCAS'02, Tulsa, OK, August 4 - 7, 2002.
  
  
  

Refereed Journal Articles:

• G. Fischer, and J. U. Varchmin: Sigma-Delta A/D Umsetzer. Qualitätssicherung für Analog-Digital Umsetzer. PTB Bericht zum 127. Helmholtz Seminar, pp. 133-165, Braunschweig und Berlin, 1996.
  
  
• G. Fischer, and A. J. Davis: Alternative Topologies for Sigma-Delta Modulators - A Comparative Study. IEEE Trans. on CAS II, pp. 789-797, October 1997
  
  
• G. Fischer, J. C. Daly, C. W. Recksiek, and K. D. Friedland: A Programmable Temperature Monitoring Device for Tagging small Fish - A Prototype Chip Development. IEEE Trans. on VLSI Systems, Vol. 05/04, pp. 401-407, December 1997.
  
  
• G. Fischer, and A. J. Davis: Behavioral Modeling of Delta-Sigma Modulators. Intl. Journal on Computer Standards and Interfaces. August 1998.
  
  
• G. Fischer, and A. J. Davis: A Wide-Band Cascade Delta-Sigma Modulator with Digital Correction for Finite Amplifier Gain Effects. IEE Electronics Letters, Vol. 34/06, pp. 511-512, March 1998.
  
  
• A. J. Davis, G. Fischer, H-H. Albrecht, and J. Hess: Digital Corrections of Circuit Imperfections in a two-stage 6th order Delta-Sigma Modulator. Elsevier: Measurement, Vol. 28/2, pp. 93-104, June 2000.
  
  
• A. J. Davis, G. Fischer: Device Technology Limitations in monolithic switched-capacitor Delta-Sigma modulators. Elsevier: Measurement, 2001.
  
  
• D. Hyun, and G. Fischer: Limit Cycle and Pattern Noise in Single-Stage Single-Bit Delta-Sigma Modulators. IEEE Trans. on Circuits & Systems I, Vol. 49, No. 5, pp. 646-656, May 2002.
  
  

Books, Book Chapters:

• G. Fischer, and A.J. Davis: Delta-Sigma Modulators. Encyclopedia of Electrical and Electronic Engineering, John G. Webster, Editor, Wiley & Sons, Inc. Vol. 19, pp. 244-254, 1999.
  
  
• G. Fischer: Multirate Systems - Design and Applications, Chapter 5, A/D Converter Applications. Gordana Jovanovic-Dolecek, Editor, Idea Group Publishing, Hershey, PA, 2001.