Papers
2021
26.
A. Abdelaal,
M. Pietzko,
M. A. Mokhtar,
J. G. Kauffman and
M. Ortmanns,
"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.
M. Pietzko,
J. Wagner,
A. Abdelaal,
J. G. Kauffman and
M. Ortmanns,
"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.
M. A. Mokhtar,
A. Abdelaal,
M. Sporer,
J. Becker,
J. G. Kauffman and
M. Ortmanns,
"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),
Apr.
2021.
2020
23.
A. Abdelaal,
J. G. Kauffman,
M. A. Mokhtar and
M. Ortmanns,
"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,
Oct.
2020.
22.
M. A. Mokhtar,
P. Vogelmann,
A. Abdelaal,
J. G. Kauffman and
M. Ortmanns,
"FIR DACs in CT Incremental Delta-Sigma Modulators",
IEEE International Symposium on Circuits and Systems (ISCAS), Sevilla, Spain,
Oct.
2020.
2018
21.
J. Sauerbrey,
J. San Pablo Garcia,
U. Schütz,
H. Khushk and
J. G. Kauffman,
"A Multi-mode GSM to LTE100 ADC",
ESSCIRC 2018 - 44th IEEE European Solid State Circuits Conference, Dresden, Germany,
Sep.
2018.
https://ieeexplore.ieee.org/document/8494250/.
2016
20.
R. Ritter,
J. G. Kauffman,
J. Becker and
M. Ortmanns,
"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,
Mar.
2016.
2014
19.
C. Chu,
J. G. Kauffman,
J. Anders,
J. Becker,
M. Ortmanns,
M. Epp and
S. Chartier,
"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,
Jun.
2014.
18.
J. G. Kauffman,
P. Witte,
M. Lehmann,
J. Becker,
Y. Manoli and
M. Ortmanns,
"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,
Feb.
2014.
https://ieeexplore.ieee.org/document/6674069.
2013
17.
J. G. Kauffman,
C. Chu,
J. Becker and
M. Ortmanns,
"A 67 dB DR 50MHz BW CT Delta Sigma Modulator Achieving 207 fJ/conv",
Asian Solid-State Circuits Conference, Singapore,
Nov.
2013.
16.
J. G. Kauffman,
R. Ritter,
C. Chu and
M. Ortmanns,
"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.
15.
C. Chu,
T. Brückner,
J. G. Kauffman,
J. Anders,
J. Becker and
M. Ortmanns,
"Analysis and Design of High Speed/High Linearity CT Delta Sigma Modulators",
IEEE International Symposium on Circuits and Systems (ISCAS), Beijing, China,
May
2013.
14.
R. Ritter,
J. G. Kauffman,
M. Lorenz and
M. Ortmanns,
"Integrator Swing Reduction in Feedback Compensated Sigma Delta Modulators",
IEEE International Symposium on Circuits and Systems (ISCAS), Beijing, China,
May
2013.
13.
J. G. Kauffman,
R. Ritter,
C. Chu,
J. Becker and
M. Ortmanns,
"Low Power Quantizer Design in CT Delta Sigma Modulators",
IEEE International Symposium on Circuits and Systems (ISCAS), Beijing, China,
May
2013.
2012
12.
C. Chu,
J. G. Kauffman and
M. Ortmanns,
"A 12-bit continuous-time third Order ΔΣ Modulator with 85dBFS SFDR in a 15MHz BW",
Kleinheubacher Tagung 2012, Miltenberg, Germany,
Sep.
2012.
11.
J. G. Kauffman,
T. Brückner and
M. Ortmanns,
"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,
Aug.
2012.
10.
J. G. Kauffman,
V. Rieger,
R. Ritter,
J. Anders and
M. Ortmanns,
"Design of a 5bit 1GSps VCO Quantizer for a CT Delta Sigma Modulator",
Conference on Ph.D. Research in Microelectronics & Electronics (PRIME), Aachen, Germany,
Jun.
2012.
9.
R. Ritter,
J. G. Kauffman and
M. Ortmanns,
"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.
P. Witte,
J. G. Kauffman,
T. Brückner,
J. Becker and
M. Ortmanns,
"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.
P. Witte,
J. G. Kauffman,
J. Becker,
Y. Manoli and
M. Ortmanns,
"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,
Feb.
2012.
6.
D. Angele,
M. Stein,
J. G. Kauffman,
M. Ortmanns and
J. Becker,
"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.
J. G. Kauffman,
P. Witte,
J. Becker and
M. Ortmanns,
"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,
Dec.
2011.
4.
P. Witte,
J. G. Kauffman,
J. Becker and
M. Ortmanns,
"Correlation Based Background Error Estimation Technique for Bandpass Delta-Sigma ADC DACs",
IEEE Trans. Circuits Syst. II, Express Briefs,
Nov.
2011.
3.
C. Chu,
J. G. Kauffman,
S. Anis and
M. Ortmanns,
"A 4-bit, 500M/s Flash Quantizer Using an Auto-Zeroing Offset Compensated Comparator in 250nm SiGe",
Kleinheubacher Tagung, Miltenberg, Germany,
Sep.
2011.
2.
P. Witte,
J. G. Kauffman,
J. Becker and
M. Ortmanns,
"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,
May
2011.
Patents
- John G. Kauffman
Low supply class AB output amplifier
[US9859856B1], Intel IP Corp.
- 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
- John G. Kauffman, Krzysztof Dufrene
Apparatus for overload recovery of an integrator in a sigma-delta modulator
[US9680496B2], Intel IP Corp.
2015
- John G. Kauffman, Udo Schuetz
Single amplifer bi-quad sigma-delta modulator
[US9559719B1], Intel IP Corp.
2015
- John G. Kauffman, Udo Schuetz
Apparatus for correcting linearity of a digital-to-analog converter
[US9509326B1], Intel IP Corp.
2015