A VCO-Based 2nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems

Yi Ting Hsieh; Shih Shuo Chang; Hao Yun Lee; Ju Yi Chen; Shuenn Yuh Lee

doi:10.1109/ISCAS48785.2022.9937661

A VCO-Based 2^nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems

Yi Ting Hsieh, Shih Shuo Chang, Hao Yun Lee, Ju Yi Chen, Shuenn Yuh Lee

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

1 Citation (Scopus)

Abstract

This paper proposes a voltage-controlled oscillator (VCO)-based 2{mathrm{n}mathrm{d}}-order continuous-time delta-sigma modulator (CTSDM) for current-sensing readout systems. The proposed VCO-based CTSDM can immediately quantize the current signal from sensor without pre-amplifier. A proportional-integral (PI) structure has been realized by injecting a resistor in series with the integrating capacitor to simplify the circuit complexity as well as maintain the system stability. A noise shaping with second order is implemented by the first-stage PI current integrator and a second-stage VCO phase integrator. The complementary current-steering digital-to-analog converter is adopted as the feedback path for the current subtraction. Simulation results show that the proposed current-sensing VCO-based CTSDM can achieve a signal-to-noise-and-distortion ratio (SNDR) of 81.36 dB in 10 kHz bandwidth while consuming only 13.2 muw under 1.2 V supply. This corresponds to a Figure-of-Merit (FoM) of 170.15 dB which is suitable for sensor readout applications in internet of thing (IoT).

Original language	English
Title of host publication	IEEE International Symposium on Circuits and Systems, ISCAS 2022
Publisher	Institute of Electrical and Electronics Engineers Inc.
Pages	2576-2579
Number of pages	4
ISBN (Electronic)	9781665484855
DOIs	https://doi.org/10.1109/ISCAS48785.2022.9937661
Publication status	Published - 2022
Event	2022 IEEE International Symposium on Circuits and Systems, ISCAS 2022 - Austin, United States Duration: 2022 May 27 → 2022 Jun 1

Publication series

Name	Proceedings - IEEE International Symposium on Circuits and Systems
Volume	2022-May
ISSN (Print)	0271-4310

Conference

Conference	2022 IEEE International Symposium on Circuits and Systems, ISCAS 2022
Country/Territory	United States
City	Austin
Period	22-05-27 → 22-06-01

All Science Journal Classification (ASJC) codes

Electrical and Electronic Engineering

Access to Document

10.1109/ISCAS48785.2022.9937661

Cite this

Hsieh, Y. T., Chang, S. S., Lee, H. Y., Chen, J. Y., & Lee, S. Y. (2022). A VCO-Based 2^nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems. In IEEE International Symposium on Circuits and Systems, ISCAS 2022 (pp. 2576-2579). (Proceedings - IEEE International Symposium on Circuits and Systems; Vol. 2022-May). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISCAS48785.2022.9937661

@inproceedings{0541753c49ac49fd931fc535b59043d0,

title = "A VCO-Based 2nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems",

abstract = "This paper proposes a voltage-controlled oscillator (VCO)-based 2{mathrm{n}mathrm{d}}-order continuous-time delta-sigma modulator (CTSDM) for current-sensing readout systems. The proposed VCO-based CTSDM can immediately quantize the current signal from sensor without pre-amplifier. A proportional-integral (PI) structure has been realized by injecting a resistor in series with the integrating capacitor to simplify the circuit complexity as well as maintain the system stability. A noise shaping with second order is implemented by the first-stage PI current integrator and a second-stage VCO phase integrator. The complementary current-steering digital-to-analog converter is adopted as the feedback path for the current subtraction. Simulation results show that the proposed current-sensing VCO-based CTSDM can achieve a signal-to-noise-and-distortion ratio (SNDR) of 81.36 dB in 10 kHz bandwidth while consuming only 13.2 muw under 1.2 V supply. This corresponds to a Figure-of-Merit (FoM) of 170.15 dB which is suitable for sensor readout applications in internet of thing (IoT).",

author = "Hsieh, {Yi Ting} and Chang, {Shih Shuo} and Lee, {Hao Yun} and Chen, {Ju Yi} and Lee, {Shuenn Yuh}",

note = "Funding Information: The authors greatly appreciate the support from the Taiwan Semiconductor Research Institute and the Ministry of Science and Technology, Taiwan (Grant MOST 110-2218-E-006-015). Publisher Copyright: {\textcopyright} 2022 IEEE.; 2022 IEEE International Symposium on Circuits and Systems, ISCAS 2022 ; Conference date: 27-05-2022 Through 01-06-2022",

year = "2022",

doi = "10.1109/ISCAS48785.2022.9937661",

language = "English",

series = "Proceedings - IEEE International Symposium on Circuits and Systems",

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booktitle = "IEEE International Symposium on Circuits and Systems, ISCAS 2022",

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Hsieh, YT, Chang, SS, Lee, HY, Chen, JY & Lee, SY 2022, A VCO-Based 2^nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems. in IEEE International Symposium on Circuits and Systems, ISCAS 2022. Proceedings - IEEE International Symposium on Circuits and Systems, vol. 2022-May, Institute of Electrical and Electronics Engineers Inc., pp. 2576-2579, 2022 IEEE International Symposium on Circuits and Systems, ISCAS 2022, Austin, United States, 22-05-27. https://doi.org/10.1109/ISCAS48785.2022.9937661

A VCO-Based 2^nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems. / Hsieh, Yi Ting; Chang, Shih Shuo; Lee, Hao Yun et al.
IEEE International Symposium on Circuits and Systems, ISCAS 2022. Institute of Electrical and Electronics Engineers Inc., 2022. p. 2576-2579 (Proceedings - IEEE International Symposium on Circuits and Systems; Vol. 2022-May).

Research output: Chapter in Book/Report/Conference proceeding › Conference contribution

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T1 - A VCO-Based 2nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems

AU - Hsieh, Yi Ting

AU - Chang, Shih Shuo

AU - Lee, Hao Yun

AU - Chen, Ju Yi

AU - Lee, Shuenn Yuh

N1 - Funding Information: The authors greatly appreciate the support from the Taiwan Semiconductor Research Institute and the Ministry of Science and Technology, Taiwan (Grant MOST 110-2218-E-006-015). Publisher Copyright: © 2022 IEEE.

PY - 2022

Y1 - 2022

N2 - This paper proposes a voltage-controlled oscillator (VCO)-based 2{mathrm{n}mathrm{d}}-order continuous-time delta-sigma modulator (CTSDM) for current-sensing readout systems. The proposed VCO-based CTSDM can immediately quantize the current signal from sensor without pre-amplifier. A proportional-integral (PI) structure has been realized by injecting a resistor in series with the integrating capacitor to simplify the circuit complexity as well as maintain the system stability. A noise shaping with second order is implemented by the first-stage PI current integrator and a second-stage VCO phase integrator. The complementary current-steering digital-to-analog converter is adopted as the feedback path for the current subtraction. Simulation results show that the proposed current-sensing VCO-based CTSDM can achieve a signal-to-noise-and-distortion ratio (SNDR) of 81.36 dB in 10 kHz bandwidth while consuming only 13.2 muw under 1.2 V supply. This corresponds to a Figure-of-Merit (FoM) of 170.15 dB which is suitable for sensor readout applications in internet of thing (IoT).

AB - This paper proposes a voltage-controlled oscillator (VCO)-based 2{mathrm{n}mathrm{d}}-order continuous-time delta-sigma modulator (CTSDM) for current-sensing readout systems. The proposed VCO-based CTSDM can immediately quantize the current signal from sensor without pre-amplifier. A proportional-integral (PI) structure has been realized by injecting a resistor in series with the integrating capacitor to simplify the circuit complexity as well as maintain the system stability. A noise shaping with second order is implemented by the first-stage PI current integrator and a second-stage VCO phase integrator. The complementary current-steering digital-to-analog converter is adopted as the feedback path for the current subtraction. Simulation results show that the proposed current-sensing VCO-based CTSDM can achieve a signal-to-noise-and-distortion ratio (SNDR) of 81.36 dB in 10 kHz bandwidth while consuming only 13.2 muw under 1.2 V supply. This corresponds to a Figure-of-Merit (FoM) of 170.15 dB which is suitable for sensor readout applications in internet of thing (IoT).

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DO - 10.1109/ISCAS48785.2022.9937661

M3 - Conference contribution

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T3 - Proceedings - IEEE International Symposium on Circuits and Systems

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BT - IEEE International Symposium on Circuits and Systems, ISCAS 2022

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Hsieh YT, Chang SS, Lee HY, Chen JY , Lee SY. A VCO-Based 2^nd-Order Continuous Time Sigma-Delta Modulator for Current-Sensing Systems. In IEEE International Symposium on Circuits and Systems, ISCAS 2022. Institute of Electrical and Electronics Engineers Inc. 2022. p. 2576-2579. (Proceedings - IEEE International Symposium on Circuits and Systems). doi: 10.1109/ISCAS48785.2022.9937661