A 134μW 24kHz-BW 103.5d8-DR CT ΔΣ Modulator with Chopped Negative-R and Tri-Level FIR DAC

Moonhyung Jang, Changuk Lee, Youngcheol Chae

Research output: Chapter in Book/Report/Conference proceedingConference contribution

Abstract

Audio applications require a high-resolution ADC with a dynamic range (DR) of more than 100dB. A continuous-time delta-sigma modulator (CTDSM) is widely used to realize such ADCs and requires high energy efficiency for battery-powered devices [1-5]. This paper presents a more efficient, highly linear CTDSM architecture for audio applications. The first integrator of the CTDSM uses a chopped negative-R in conjunction with a tri-level FIR DAC to increase energy-efficiency. Non-idealities of an active-RC integrator are compensated using a negative-R at the virtual ground of the integrator, and the negative-R is then chopped to remove its 1/f noise at a notch frequency of the feedback FIR filter. A 6-tap, tri-level FIR DAC is realized with a resistive non-return-to-zero (NRZ) DAC whose inter-symbol-interference (ISI) is kept less than -120dB. As a result, this work achieves 99.4dB SNDR, 101dB SNR, 103.5dB DR, and 110.2dB SFDR in a 24kHz bandwidth while consuming only 134μW. This corresponds to a Schreier FoM of 186dB.

Original languageEnglish
Title of host publication2020 IEEE International Solid-State Circuits Conference, ISSCC 2020
PublisherInstitute of Electrical and Electronics Engineers Inc.
Pages1-3
Number of pages3
ISBN (Electronic)9781728132044
DOIs
Publication statusPublished - 2020 Feb
Event2020 IEEE International Solid-State Circuits Conference, ISSCC 2020 - San Francisco, United States
Duration: 2020 Feb 162020 Feb 20

Publication series

NameDigest of Technical Papers - IEEE International Solid-State Circuits Conference
Volume2020-February
ISSN (Print)0193-6530

Conference

Conference2020 IEEE International Solid-State Circuits Conference, ISSCC 2020
CountryUnited States
CitySan Francisco
Period20/2/1620/2/20

All Science Journal Classification (ASJC) codes

  • Electronic, Optical and Magnetic Materials
  • Electrical and Electronic Engineering

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    Jang, M., Lee, C., & Chae, Y. (2020). A 134μW 24kHz-BW 103.5d8-DR CT ΔΣ Modulator with Chopped Negative-R and Tri-Level FIR DAC. In 2020 IEEE International Solid-State Circuits Conference, ISSCC 2020 (pp. 1-3). [9062904] (Digest of Technical Papers - IEEE International Solid-State Circuits Conference; Vol. 2020-February). Institute of Electrical and Electronics Engineers Inc.. https://doi.org/10.1109/ISSCC19947.2020.9062904