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Author:

Lang, Wei (Lang, Wei.) | Wan, Peiyuan (Wan, Peiyuan.) | Lin, Pingfen (Lin, Pingfen.)

Indexed by:

EI Scopus SCIE

Abstract:

This paper presents a low-power low-voltage chopper stabilized discrete-time second-order feed-forward Sigma Delta modulator with an asynchronous 4-bit successive-approximation-register (SAR) quantizer. The feed-forward topology will reduce the internal signal swing, relaxing the linearity and slew rate requirements for an operational amplifier (op-amp). The analog weighted summation of feed-forward paths is merged with the sampling capacitor array of a SAR quantizer to minimize the distortion and associated hardware overhead. To achieve low power consumption, a partially switched op-amp bias in weak inversion is used for the first integrator. The energy efficiency is further improved by the asynchronous SAR 4-bit quantizer. Moreover, the asynchronous scheme will reduce loop delay caused by the summation block, the quantizer and the data weighted averaging (DWA) circuit, improving circuit stability and lowering power consumption. A 0.13-mu m CMOS experimental prototype achieves 84 dB dynamic range, 84 dB peak SNR and 82 dB peak SNDR over an input signal bandwidth of 10-kHz. The total power consumption of the modulator is 48 mu W from a 0.8V supply at an 800-kHz sampling rate.

Keyword:

asynchronous SAR low power chopper stabilization Sigma Delta modulator low voltage switched-capacitor circuits

Author Community:

  • [ 1 ] [Lang, Wei]Beijing Univ Technol, Beijing Embedded Syst Key Lab, Beijing 100124, Peoples R China
  • [ 2 ] [Wan, Peiyuan]Beijing Univ Technol, Beijing Embedded Syst Key Lab, Beijing 100124, Peoples R China
  • [ 3 ] [Lin, Pingfen]Beijing Univ Technol, Beijing Embedded Syst Key Lab, Beijing 100124, Peoples R China

Reprint Author's Address:

  • [Lang, Wei]Beijing Univ Technol, Beijing Embedded Syst Key Lab, 100 Pingle Yuan, Beijing 100124, Peoples R China

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Source :

JOURNAL OF CIRCUITS SYSTEMS AND COMPUTERS

ISSN: 0218-1266

Year: 2013

Issue: 4

Volume: 22

1 . 5 0 0

JCR@2022

ESI Discipline: ENGINEERING;

JCR Journal Grade:4

CAS Journal Grade:4

Cited Count:

WoS CC Cited Count: 1

SCOPUS Cited Count: 1

ESI Highly Cited Papers on the List: 0 Unfold All

WanFang Cited Count:

Chinese Cited Count:

30 Days PV: 2

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