Publications - Dr.-Ing. J. G. Kauffman

Papers  Patents

Papers

2022

31.
Sporer, M.; Reich, S.; Kauffman, J. G.; Ortmanns, M.
A Direct Digitizing Chopped Neural Recorder Using a Body-Induced Offset Based DC Servo Loop
IEEE Transactions on Biomedical Circuits and Systems
June 2022
DOI:10.1109/TBCAS.2022.3177241
30.
Mokhtar, M. A.; Abdelaal, A.; Sporer, M.; Becker, J.; Kauffman, J. G.; Ortmanns, M.
A 0.9-V DAC-Calibration-Free Continuous-Time Incremental Delta-Sigma Modulator Achieving 97-dB SFDR at 2 MS/s in 28-nm CMOS
IEEE Journal of Solid-State Circuits
March 2022
DOI:10.1109/JSSC.2022.3160325

2021

29.
Mokhtar, M. A.; Merkle, M.; Kauffman, J. G.; Ortmanns, M.
A Comparative Study of Noise Behavior in Single-Opamp Resonators in Delta-Sigma Modulators
28th IEEE International Conference on Electronics, Circuits, and Systems (ICECS), Dubai, UAE
November 2021
28.
Ungethüm, J.; Kauffman, J. G.; Ortmanns, M.
Digital Resolution Requirements in 0-X Mash Delta-Sigma-Modulators
2021 IEEE International Conference on Electronics Circuits and Systems (ICECS)
November 2021
27.
Ungethüm, J.; Kauffman, J. G.; Ortmanns, M.
Minimizing Signal-Dependent Residue in CT Pipelined ADCs
2021 IEEE International Midwest Symposium on Circuits and Systems (MWSCAS)
August 2021
26.
Abdelaal, A.; Pietzko, M.; Mokhtar, M. A.; Kauffman, J. G.; Ortmanns, M.
FIR filter with Symmetric Non-Equal Coefficients for CT Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea (Online)
May 2021
25.
Pietzko, M.; Wagner, J.; Abdelaal, A.; Kauffman, J. G.; Ortmanns, M.
Influence of Excess Loop Delay on the STF of Continuous-Time Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Daegu, Korea (Online)
May 2021
24.
Mokhtar, M. A.; Abdelaal, A.; Sporer, M.; Becker, J.; Kauffman, J. G.; Ortmanns, M.
A 0.9-V Calibration-Free 97dB-SFDR 2-MS/s Continuous­Time Incremental Delta-Sigma ADC Utilizing Variable Bit-Width Quantizer in 28nm CMOS
IEEE Custom Integrated Circuits Conference (CICC), Texas, USA (Virtual)
April 2021

2020

23.
Abdelaal, A.; Kauffman, J. G.; Mokhtar, M. A.; Ortmanns, M.
A Comparative Study of ISI Errors in Different DAC Structures for CT Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Sevilla, Spain
October 2020
22.
Mokhtar, M. A.; Vogelmann, P.; Abdelaal, A.; Kauffman, J. G.; Ortmanns, M.
FIR DACs in CT Incremental Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Sevilla, Spain
October 2020

2018

21.
Sauerbrey, J.; San Pablo Garcia, J.; Schütz, U.; Khushk, H.; Kauffman, J. G.
A Multi-mode GSM to LTE100 ADC
ESSCIRC 2018 - 44th IEEE European Solid State Circuits Conference, Dresden, Germany
September 2018

2016

20.
Ritter, R.; Kauffman, J. G.; Becker, J.; Ortmanns, M.
A 10 MHz Bandwidth, 70 dB SNDR Continuous Time Delta-Sigma Modulator With Digitally Improved Reconfigurable Blocker Rejection
IEEE Journal of Solid-State Circuits, vol. 51, no. 3, pp. 660-670
March 2016

2014

19.
Chu, C.; Kauffman, J. G.; Anders, J.; Becker, J.; Ortmanns, M.; Epp, M.; Chartier, S.
A 1.92-GS/s CT ΔΣ modulator with 70-db DR and 78-db SFDR in 15-MHz bandwidth
IEEE NEWCAS 2014, Trois-Rivières, Kanada
June 2014
18.
Kauffman, J. G.; Witte, P.; Lehmann, M.; Becker, J.; Manoli, Y.; Ortmanns, M.
A 72 dB DR, CT ΔΣ Modulator Using Digitally Estimated, Auxiliary DAC Linearization Achieving 88 fJ/conv-step in a 25 MHz BW
IEEE Journal of Solid-State Circuits, Vol. 49, No. 2
February 2014

2013

17.
Kauffman, J. G.; Chu, C.; Becker, J.; Ortmanns, M.
A 67 dB DR 50MHz BW CT Delta Sigma Modulator Achieving 207 fJ/conv
Asian Solid-State Circuits Conference, Singapore
November 2013
16.
Kauffman, J. G.; Ritter, R.; Chu, C.; Becker, J.; Ortmanns, M.
Low Power Quantizer Design in CT Delta Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Beijing, China
May 2013
15.
Kauffman, J. G.; Ritter, R.; Chu, C.; Ortmanns, M.
A Native Switched DAC Cell with low ISI for CT Delta Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Beijing, China
May 2013
14.
Ritter, R.; Kauffman, J. G.; Lorenz, M.; Ortmanns, M.
Integrator Swing Reduction in Feedback Compensated Sigma Delta Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Beijing, China
May 2013
13.
Chu, C.; Brückner, T.; Kauffman, J. G.; Anders, J.; Becker, J.; Ortmanns, M.
Analysis and Design of High Speed/High Linearity CT Delta Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Beijing, China
May 2013

2012

12.
Chu, C.; Kauffman, J. G.; Ortmanns, M.
A 12-bit continuous-time third Order ΔΣ Modulator with 85dBFS SFDR in a 15MHz BW
Kleinheubacher Tagung 2012, Miltenberg, Germany
September 2012
11.
Kauffman, J. G.; Brückner, T.; Ortmanns, M.
PVT Robust Design of Wideband CT Delta Sigma Modulators Including Finite GBW Compensation
The 55th IEEE International Midwest Symposium on Circuits and Systems (MWSCAS), Boise, Idaho, USA
August 2012
10.
Kauffman, J. G.; Rieger, V.; Ritter, R.; Anders, J.; Ortmanns, M.
Design of a 5bit 1GSps VCO Quantizer for a CT Delta Sigma Modulator
Conference on Ph.D. Research in Microelectronics & Electronics (PRIME), Aachen, Germany
June 2012
9.
Ritter, R.; Kauffman, J. G.; Ortmanns, M.
A power efficient MDAC design with correlated double sampling for a 2-step-flash ADC
IEEE International Symposium on Circuits and Systems (ISCAS), Seoul, Korea
May 2012
8.
Witte, P.; Kauffman, J. G.; Brückner, T.; Becker, J.; Ortmanns, M.
An Error Estimation Technique for Lowpass and Bandpass Delta-Sigma ADC Feedback DACs Using a Residual Test Signal
IEEE International Symposium on Circuits and Systems (ISCAS), Seoul, Korea
May 2012
7.
Witte, P.; Kauffman, J. G.; Becker, J.; Manoli, Y.; Ortmanns, M.
A 72dB-DR Delta-Sigma CT Modulator Using Digitally Estimated Auxiliary DAC Linearization Achieving 88fJ/conv in a 25 MHz BW
IEEE International Conference on Solid-State Circuits (ISSCC), San Francisco, USA
February 2012

Patents

  1. John G. Kauffman
    Low supply class AB output amplifier
    [US9859856B1], Intel IP Corp.

  2. Marco Bresciani, John G. Kauffman, Udo Schuetz, Patrick Torta, Francesco Conzatti 
    Sigma-delta analog-to-digital converter including loop filter having components for feedback digital-to-analog converter correction
    [US9866227B1]
    2016

  3. John G. Kauffman, Krzysztof Dufrene
    Apparatus for overload recovery of an integrator in a sigma-delta modulator
    [US9680496B2], Intel IP Corp.
    2015

  4. John G. Kauffman, Udo Schuetz
    Single amplifer bi-quad sigma-delta modulator
    [US9559719B1], Intel IP Corp.
    2015

  5. John G. Kauffman, Udo Schuetz
    Apparatus for correcting linearity of a digital-to-analog converter
    [US9509326B1], Intel IP Corp.
    2015