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

Papers  Patents

Papers

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)
Mai 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)
Mai 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
Oktober 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
Oktober 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
März 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
Juni 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
Februar 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.
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
Mai 2013
15.
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
Mai 2013
14.
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
Mai 2013
13.
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
Mai 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
Juni 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
Mai 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
Mai 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
Februar 2012
6.
Angele, D.; Stein, M.; Kauffman, J. G.; Ortmanns, M.; Becker, J.
A reconfigurable Continuous-Time ΔΣ-ADC using a digitally programmable gm-C array
IEEE 55th International Midwest Symposium on Circuits and Systems (MWSCAS)
2012

2011

5.
Kauffman, J. G.; Witte, P.; Becker, J.; Ortmanns, M.
An 8.5 mW Continuous-Time Delta-Sigma Modulator With 25 MHz Bandwidth Using Digital Background DAC Linearization to Achieve 63.5 dB SNDR and 81 dB SFDR
IEEE Journal of Solid-State Circuits
Dezember 2011
4.
Witte, P.; Kauffman, J. G.; Becker, J.; Ortmanns, M.
Correlation Based Background Error Estimation Technique for Bandpass Delta-Sigma ADC DACs
IEEE Trans. Circuits Syst. II, Express Briefs
November 2011
3.
Chu, C.; Kauffman, J. G.; Anis, S.; Ortmanns, M.
A 4-bit, 500M/s Flash Quantizer Using an Auto-Zeroing Offset Compensated Comparator in 250nm SiGe
Kleinheubacher Tagung, Miltenberg, Germany
September 2011
2.
Witte, P.; Kauffman, J. G.; Becker, J.; Ortmanns, M.
A digital background correction for DAC nonlinearities in lowpass and bandpass delta-sigma modulators - theory and implementation
The 9th Int. Conf. on Sampling Theory and Applications (SampTA), Singapore
Mai 2011

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