A Continuous-Time Zoom ADC for Low-Power Audio Applications

Research output: Contribution to journalArticleScientificpeer-review

Abstract

This article presents a continuous-Time zoom analog to digital converter (ADC) for audio applications. It employs a high-speed asynchronous SAR ADC that dynamically updates the references of a continuous-Time delta-sigma modulator (CTDSM). Compared to previous switched-capacitor (SC) zoom ADCs, its input impedance is essentially resistive, which relaxes the power dissipation of its reference and input buffers. Fabricated in a 160-nm CMOS process, the ADC occupies 0.27 mm 2 and achieves 108.1-dB peak SNR, 106.4-dB peak signal to noise and distortion ratio (SNDR), and 108.5-dB dynamic range in a 20-kHz bandwidth while consuming 618 \mu \text{W}. This results in a Schreier figure of merit (FoM) of 183.6 dB.

Original languageEnglish
Article number8945179
Pages (from-to)1023-1031
Number of pages9
JournalIEEE Journal of Solid-State Circuits
Volume55
Issue number4
DOIs
Publication statusPublished - 2020

Keywords

  • A/D conversion
  • asynchronous SAR analog to digital converter (ADC)
  • audio ADC
  • continuous-Time delta-sigma
  • delta-sigma ADC
  • dynamic zoom ADC
  • inverter-based operational transconductance amplifier (OTA)
  • low-power circuits

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