dr. Fan

Assistant Professor
Electronic Instrumentation (EI), Department of Microelectronics

PhD thesis (Dec 2013): Capacitively-Coupled Chopper Amplifiers
Promotor: Kofi Makinwa

Expertise: class D amplifiers, power management ICs and wireless sensor network

Themes: High-performance Analog and Power

Biography

Qinwen Fan received the B.Sc. degree in electronic science and technology from Nankai University in China in 2006 and the M.Sc. degree (cum laude) in microelectronics from Delft University of Technology, The Netherlands in 2008. She further continued as a PhD candidate in the same university and has received the degree in 2013. From August 2007 to August 2008, she was an intern at NXP Research Laboratories, Eindhoven, The Netherlands, where she designed a precision instrumentation amplifier for bio-medical purposes. From October 2012 to May 2015, she worked at Maxim Integrated Products in Delft, The Netherlands. From June 2015 to January 2017, she worked at Mellanox in Delft, the Netherlands. Since 2017, she rejoined the Delft University of Technology and is currently an Assistant Professor in the electronics and instrumentation laboratory.

Her current research interests include: precision analog; class D audio amplifiers; DC-DC converters for energy harvesters; current-sensing amplifiers.

Dr. Fan serves as an associate editor of Open Journal of the Solid-State Circuits Society (OJ-SSCS), a TPC member of the International Solid-State Circuits Conference (ISSCC), VLSI Symposium on Technology and Circuits, and European Solid-state circuits conference (ESSCIRC).

EE4C08 Measurement and instrumentation

A broad introduction to measurement and instrumentation systems

EE4C10 Analog Circuit Design Fundamentals

ET4382 Introduction to power conversion technology

This course teaches you how to design class D audio amplifiers, inductive and capacitive DC-DC converters in CMOS technology.

  1. A −121.5 dB THD Class-D Audio Amplifier with 49 dB Suppression of LC Filter Nonlinearity and Robust to +/−30% LC Filter Spread
    H. Zhang; M. Berkhout; K. Makinwa; Q. Fan;
    In Dig. Techn. Paper IEEE Symposium on VLSI Circuits (VLSI),
    June 2021. DOI: 10.23919/VLSICircuits52068.2021.9492441

  2. A 25A Hybrid Magnetic Current Sensor with 64mA Resolution, 1.8MHz Bandwidth, and a Gain Drift Compensation Scheme
    A. Jouyaeian; Q. Fan; M. Motz; U. Ausserlechner; K. A. A. Makinwa;
    In Dig. Techn. Papers IEEE International Solid-State Circuits Conference (ISSCC),
    February 2021. DOI: 10.1109/ISSCC42613.2021.9365767

  3. A 28-W, -102.2-dB THD+N Class-D Amplifier Using a Hybrid Δ Σ M-PWM Scheme
    S. Karmakar; H. Zhang; R. van Veldhoven; L. J. Breems; M. Berkhout; Q. Fan; K. A. A. Makinwa;
    IEEE Journal of Solid-State Circuits,
    September 2020. DOI: 10.1109/JSSC.2020.3023874
    Abstract: ... This article presents a 28-W class-D amplifier for automotive applications. The combination of a high switching frequency and a hybrid multibit Δ ΣM-PWM scheme results in high linearity over a wide range of output power, as well as low AM-band EMI. As a result, only a small (150-kHz cutoff frequency), and thus low-cost, LC filter is needed to meet the CISPR-25 EMI average limit (150 kHz-30 MHz) with 10-dB margin. At 28-W output power, the proposed amplifier achieves 91% efficiency while driving a 4-Ω load from a 14.4-V supply. It attains a peak THD+N of 0.00077% (-102.2 dB) for a 1-kHz input signal.

  4. A High-Linearity and Low-EMI Multilevel Class-D Amplifier
    H. Zhang; S. Karmakar; L. J. Breems; Q. Sandifort; M. Berkhout; K. A. A. Makinwa; Q. Fan;
    IEEE Journal of Solid-State Circuits,
    Volume 56, pp. 1176-1185, December 2020. DOI: 10.1109/JSSC.2020.3043815
    Abstract: ... This article presents a Class-D audio amplifier for automotive applications. Low electromagnetic interference (EMI) and, hence, smaller LC filter size are obtained by employing a fully differential multilevel output stage switching at 4.2 MHz. A modulation scheme with minimal switching activity at zero input reduces idle power, which is further assisted by a gate-charge reuse scheme. It also achieves high linearity due to the high loop gain realized by a third-order feedback loop with a bandwidth of 800 kHz. The prototype, fabricated in a 180-nm high-voltage BCD process, achieves a minimum THD+N of −107.8 dB/−102 dB and a peak efficiency of 91%/87% with 8- and 4- Ω loads, respectively, while drawing 7-mA quiescent current from a 14.4-V supply. The prototype meets the CISPR 25 Class 5 EMI standard with a 5.7-dB margin using an LC filter with a cutoff frequency of 580 kHz.

  5. A 28W -108.9dB/-102.2dB THD/THD+N Hybrid ΔΣ−PWM Class-D Audio Amplifier with 91% Peak Efficiency and Reduced EMI Emission
    S. Karmakar; H. Zhang; R.Van Veldhoven; L. Breems; M. Berkhout; Q. Fan; K.A.A Makinwa;
    In Dig. Techn. Papers IEEE International Solid-State Circuits Conference (ISSCC),
    pp. 350-352, 2 2020. DOI: 10.1109/ISSCC19947.2020.9063001

  6. A −107.8 dB THD+N Low-EMI Multi-Level Class-D Audio Amplifier
    H. Zhang; S. Karmakar; L. Breems; Q. Sandifort; M. Berkhout; K. Makinwa; Q. Fan;
    In Dig. Techn. Paper IEEE Symposium on VLSI Circuits (VLSI),
    June 2020. DOI: 10.1109/VLSICircuits18222.2020.9162793

  7. Capacitance-to-digital converter
    H. Fan; M. Pertijs; B. A. J. Buter;
    Patent, US 10,732,577, August 2020.

  8. Design Considerations for a Mems Coriolis Mass Flow Sensing System
    A.C. de Oliveira; T. Schut; J. Groenesteijn; Q. Fan; R.Wiegerink; K.A.A. Makinwa;
    In MFHS,
    2019.

  9. A MEMS Coriolis Mass Flow Sensing System with Combined Drive and Sense Interface
    A. de Oliveira; T. Schut; J. Groenesteijn; Q. Fan; R. Wiegerink; K. Makinwa;
    In Proc. IEEE Sensors,
    October 2019.

  10. A MEMS Coriolis Mass Flow Sensing System with Combined Drive and Sense Interface
    A.C. de Oliveira; T. Schut; J. Groenesteijn; Q. Fan; R.Wiegerink; K.A.A. Makinwa;
    In Proc. IEEE SENSORS,
    10 2019. DOI: 10.1109/SENSORS43011.2019.8956695

  11. Capacitively-Coupled Chopper Instrumentation Amplifiers: An Overview
    Qinwen Fan; Kofi A. A. Makinwa;
    In Proc. IEEE Sensors,
    10 2018. DOI: 10.1109/ICSENS.2018.8589958

  12. Fully Capacitive Coupled Input Choppers
    J. H. Huijsing; Q. Fan; K. A. A. Makinwa;
    Patent, US US10033369B2, July 2018. Assignee: Maxim Integrated Products Inc.

  13. Capacitively-Coupled Chopper Operational Amplifiers
    Q. Fan; K.A.A. Makinwa; J.H. Huising;
    Springer, , 2017.

  14. A High-Resolution Capacitance-to-Digital Converter based on Iterative Discharging
    Hao Fan;
    MSc thesis, Delft University of Technology, October 2017.
    document

  15. Advances in Low-Offset Opamps
    Q. Fan; J.H. Huising; K.A.A. Makinwa;
    Switzerland: Springer, , 2016.

  16. Fast-Settling Capacitive-Coupled Amplifiers
    J.H. Huijsing; Q. Fan; K.A.A. Makinwa; D. Fu; J. Wu; L. Zhou;
    Patent, 9,294,049, March 22 2016.

  17. A 110dB SNR ADC with ±30V input common-mode range and 8¿V Offset for current sensing applications
    L. Xu; B. Gönen; Q. Fan; J.H. Huijsing; K.A.A. Makinwa;
    In M Romdhane; LC Fujino; J Anderson (Ed.), Proceedings of the 2015 IEEE International Solid-State Circuits Conference,
    IEEE, pp. 89-91, 2015. Harvest Session 5.2.

  18. Measurement and analysis of current noise in chopper amplifiers
    J. Xu; Q. Fan; J.H. Huijsing; C. van Hoof; R.F. Yazicioglu; K.A.A. Makinwa;
    IEEE Journal of Solid State Circuits,
    Volume 48, Issue 7, pp. 1575-1584, 2013. Harvest.

  19. A multi-path chopper-stabilized capacitively coupled operational amplifier with 20V-input-common-mode range and 3μV offset
    Q. Fan; J.H. Huijsing; K.A.A. Makinwa;
    In A Chandrakasan (Ed.), Digest of Technical Papers - 2013 IEEE International Solid-State Circuits Conference (ISSCC 2013),
    IEEE, pp. 176-177, 2013. Harvest Session 10.

  20. Capacitively coupled chopper amplifiers
    Q. Fan;
    PhD thesis, Delft University of Technology, 2013. Onder embargo; staat niet in de IR van de Bibliotheek.

  21. A 21 nV/√ Hz chopper-stabilized multi-path current-feedback instrumentation amplifier with 2 μ v offset
    Q. Fan; J.H. Huijsing; K.A.A. Makinwa;
    IEEE Journal of Solid State Circuits,
    Volume 47, Issue 2, pp. 464-475, February 2012. Harvest Article number: 6112184.

  22. Measurement and analysis of input current noise in chopper amplifiers
    J. Xu; Q. Fan; J.H. Huijsing; C. van Hoof; R.F. Yazicioglu; K.A.A. Makinwa;
    In Y. Deval; J-B Begueret; D Belot (Ed.), Proceedings 2012 38th European Solid-State Circuit Conference,
    IEEE, pp. 81-84, 2012.

  23. A capacitively coupled chopper instrumentation amplifier with a ±30V common-mode range, 160dB CMRR and 5μV offset
    Q. Fan; J.H. Huijsing; K.A.A. Makinwa;
    In L Fujino (Ed.), Digest of Technical Papers - 2012 IEEE International Solid-state Circuits Conference,
    IEEE, pp. 374-375, 2012. Harvest Article number: 6177045.

  24. A capacitively-coupled chopper operational amplifier with 3μV Offset and outside-the-rail capability
    Q. Fan; J.H. Huijsing; K.A.A. Makinwa;
    In Y. Deval; J-B Begueret; D Belot (Ed.), Proceedings 2012 38th European Solid-State Circuit Conference,
    IEEE, pp. 73-76, 2012.

  25. A 1.8 µW 60 nV/√Hz Capacitively-Coupled Chopper Instrumentation Amplifier in 65 nm CMOS for Wireless Sensor Nodes
    Qinwen Fan; Fabio Sebastiano; Johan H. Huijsing; Kofi A.A. Makinwa;
    {IEEE} J. Solid-State Circuits,
    Volume 46, Issue 7, pp. 1534 - 1543, July 2011. DOI: 10.1109/JSSC.2011.2143610
    Keywords: ... CMOS integrated circuits;choppers (circuits);instrumentation amplifiers;wireless sensor networks;CMOS technology;CMRR;DC servo loop;PSRR;biopotential sensing;capacitively-coupled chopper instrumentation amplifier;chopping ripple;current 1.8 muA;electrode offset suppression;low-power precision instrumentation amplifier;noise efficiency factor;positive feedback loop;power 1.8 muW;rail-to-rail input common-mode range;ripple reduction loop;size 65 nm;voltage 1 V;wireless sensor nodes;Capacitors;Choppers;Impedance;Noise;Sensors;Topology;Wireless sensor networks;Bio-signal sensing;chopping;high power efficiency;low offset;low power;precision amplifier;wireless sensor nodes.

    Abstract: ... This paper presents a low-power precision instrumentation amplifier intended for use in wireless sensor nodes. It employs a capacitively-coupled chopper topology to achieve a rail-to-rail input common-mode range as well as high power efficiency. A positive feedback loop is employed to boost its input impedance, while a ripple reduction loop suppresses the chopping ripple. To facilitate bio-potential sensing, an optional DC servo loop may be employed to suppress electrode offset. The IA achieves 1 µV offset, 0.16% gain inaccuracy, 134 dB CMRR, 120 dB PSRR and a noise efficiency factor of 3.3. The instrumentation amplifier was implemented in a 65 nm CMOS technology. It occupies only 0.1 mm² chip area (0.2 mm² with the DC servo loop) and consumes 1.8 µA current (2.1 µA with the DC servo loop) from a 1 V supply.

  26. Input characteristics of a chopped multi-path current feedback instrumentation amplifier
    Q. Fan; J.H. Huijsing; K.A.A. Makinwa;
    In {De Venuto}, D; L Benini (Ed.), 4th IEEE International Workshop on Advances in Sensors and Interfaces (IWASI),
    IEEE, pp. 61-66, 2011.

  27. A 21nV/¿Hz chopper-stabilized multipath current-feedback instrumentation amplifier with 2µV offset
    Q. Fan; J.H. Huijsing; K.A.A. Makinwa;
    In H Hidaka; B. Nauta (Ed.), Digest of Technical Papers - 2010 IEEE International Solid-State Circuits Conference,
    IEEE, pp. 80-81, 2010.

  28. A 1.8µW 1-µV-offset capacitively-coupled chopper instrumentation amplifier in 65nm CMOS
    Qinwen Fan; Fabio Sebastiano; Johan H. Huijsing; Kofi A.A. Makinwa;
    In Proc. European Solid-State Circuits Conference,
    Sevilla, Spain, pp. 170 - 173, September14--16 2010. DOI: 10.1109/ESSCIRC.2010.5619902
    Keywords: ... CMOS integrated circuits;instrumentation amplifiers;CMOS;input impedance;noise efficiency factor;positive feedback loop;precision capacitively-coupled chopper instrumentation amplifier;rail-to-rail DC common-mode input range;ripple reduction loop;size 65 nm;Accuracy;Choppers;Impedance;Instruments;Noise;Resistors;Topology.

    Abstract: ... This paper describes a precision capacitively-coupled chopper instrumentation amplifier (CCIA). It achieves 1µV offset, 134dB CMRR, 120dB PSRR, 0.16% gain accuracy and a noise efficiency factor (NEF) of 3.1, which is more than 3x better than state-of-the-art. It has a rail-to-rail DC common-mode (CM) input range. Furthermore, a positive feedback loop (PFL) is used to boost the input impedance, and a ripple reduction loop (RRL) is used to reduce the ripple associated with chopping. The CCIA occupies only 0.1mm² in a 65nm CMOS technology. It can operate from a 1V supply, from which it draws only 1.8µA.

  29. A 2.1 µW Area-Efficient Capacitively-Coupled Chopper Instrumentation Amplifier for ECG Applications in 65 nm CMOS
    Qinwen Fan; Fabio Sebastiano; Johan H. Huijsing; Kofi A.A. Makinwa;
    In Proc. Asian Solid-State Circuits Conference,
    Beijing, China, pp. 1 - 4, November8--10 2010. DOI: 10.1109/ASSCC.2010.5716624
    Keywords: ... CMOS integrated circuits;amplifiers;biomedical electrodes;choppers (circuits);electrocardiography;CMOS technology;DC servo loop;ECG application;area efficient chopper instrumentation amplifier;capacitive feedback network;capacitively coupled chopper instrumentation amplifier;electrocardiography;electrode-tissue interface;power 2.1 muW;switched capacitor integrator;Choppers;DSL;Earth Observing System;Electrocardiography;Impedance;Instruments;Noise.

    Abstract: ... This paper describes a capacitively-coupled chopper instrumentation amplifier for use in electrocardiography (ECG). The amplifier's gain is accurately defined by a capacitive feedback network, while a DC servo loop rejects the DC offset generated by the electrode-tissue interface. The high-pass corner frequency established by the servo loop is realized by an area-efficient switched-capacitor integrator. Additional feedback loops are employed to boost the amplifier's input-impedance to 80 MΩ and to suppress the chopper ripple. Implemented in a 65 nm CMOS technology, the amplifier draws 2.1 µA from a 1 V supply and occupies 0.2 mm².

  30. Very thin SiC membranes for micromachines vacuum sensors
    H.T.M. Pham; C. Fan; G. Pandraud; J.F. Creemer; N.M. van der Pers; P. Visser; K. Kwakernaak; P.M. Sarro;
    In s.n. (Ed.), Proceedings of IEEE sensors 2008,
    IEEE Sensors, pp. 1143-1146, 2008.

  31. A chopper instrumentation amplifier for biopotential applications
    Q. Fan;
    PhD thesis, Delft University of Technology, 2008.

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Last updated: 20 May 2022