A 134-μW 99.4-dB SNDR Audio Continuous-Time Delta-Sigma Modulator with Chopped Negative-R and Tri-Level FIR-DAC

Moonhyung Jang, Changuk Lee, Youngcheol Chae

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

This article presents a low-power audio continuous-time delta-sigma modulator (CTDSM) that employs a chopped negative-R and a tri-level finite impulse-response (FIR) DAC. The noise of the first opamp is mitigated by using a negative-R at the virtual ground of the first integrator, and the negative-R is then chopped to remove the intrinsic ${1/f}$ noise of the negative-R. The highly linear feedback DAC is realized with a 6-tap tri-level FIR-DAC whose inter-symbol interference (ISI) is kept less than -120 dB. The CTDSM fabricated in 65-nm CMOS technology occupies an active area of 0.28 mm2. It achieves 99.4-dB SNDR, 101-dB SNR, 102.8-dB dynamic range (DR), and 110.2-dB SFDR in a 24-kHz bandwidth, while consuming only $134~\mu \text{W}$. This corresponds to a state-of-the-art figure-of-merit (FoM) of 185.3 dB.

Original languageEnglish
Article number9252136
Pages (from-to)1761-1771
Number of pages11
JournalIEEE Journal of Solid-State Circuits
Volume56
Issue number6
DOIs
Publication statusPublished - 2021 Jun

Bibliographical note

Publisher Copyright:
© 1966-2012 IEEE.

All Science Journal Classification (ASJC) codes

  • Electrical and Electronic Engineering

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