Institut für Mikroelektronik

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

Papers  Patents

Papers

2023

38.
Jang, MH.; Tang, X.; Lim, Y.; Kauffman, J. G.; Sun, L.; Ortmanns, M.; Chae, Y.
Design Techniques for Energy Efficient Analog-to-Digital Converters
IEEE Open Journal of the Solid-State Circuits Society
September 2023
DOI:10.1109/OJSSCS.2023.3311418
37.
Pietzko, M.; Spiess, J.; Ungethüm, J.; Kauffman, J. G.; Li, Q.; Ortmanns, M.
Bitwise ELD Compensation under Integrator Nonidealities in ΔΣ Modulators
21st IEEE Interregional NEWCAS Conference (NEWCAS), Edinburgh, United Kingdom
Juni 2023
DOI:10.1109/NEWCAS57931.2023.10198050
36.
Pietzko, M.; Ungethüm, J.; Kauffman, J. G.; Ortmanns, M.
Delay Error Shaping in ΔΣ Modulators Using Time-Interleaved High Resolution Quantizers
IEEE Transactions on Circuits and Systems I: Regular Papers
Mai 2023
DOI:10.1109/TCSI.2023.3269573
35.
Dalla Longa, M.; Conzatti, F.; Hofmann, T.; Kauffman, J. G.; Ortmanns, M.
An Intrinsically Linear 13-Level Capacitive DAC for Delta Sigma Modulators
IEEE Transactions on Circuits and Systems II: Express Briefs
April 2023
DOI:doi.org/10.1109/TCSII.2022.3224878

2022

34.
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, Volume: 57, Issue: 11
November 2022
DOI:10.1109/JSSC.2022.3160325
33.
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
Juni 2022
DOI:10.1109/TBCAS.2022.3177241
32.
Pietzko, M.; Ungethüm, J.; Kauffman, J. G.; Li, Q.; Ortmanns, M.
Bitwise ELD Compensation in ∆Σ Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Austin, USA
Mai 2022
DOI:10.1109/ISCAS48785.2022.9937305
31.
Driemeyer, B.; Spiess, J.; Kauffman, J. G.; Ortmanns, M.
Complexity Reduced LUT-Based DAC Correction in Continuous-Time Delta-Sigma Modulators
IEEE International Symposium on Circuits and Systems (ISCAS)
Mai 2022
DOI:10.1109/ISCAS48785.2022.9937300
30.
Ungethüm, J.; Pietzko, M.; Kauffman, J. G.; Li, Q.; Ortmanns, M.
Maximizing the Inter-Stage Gain in CT 0-X MASH Delta-Sigma-Modulators
IEEE International Symposium on Circuits and Systems (ISCAS), Austin, TX, USA
Mai 2022
DOI:10.1109/ISCAS48785.2022.9937739

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)
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.
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
15.
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
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
Mai 2013

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