Advances in voltage-controlled-oscillator-based δσ ADCs

Shaolan Li, Arindam Sanyal, Kyoungtae Lee, Yeonam Yoon, Xiyuan Tang, Yi Zhong, Kareem Ragab, Nan Sun

Research output: Contribution to journalArticlepeer-review

4 Scopus citations


Ring voltage-controlled-oscillators (VCOs) are increasingly being used to design δσ ADCs. They have the merits of simple, highly digital and low-voltage tolerant, making them attractive alternatives for the classic scaling-unfriendly operational-amplifier-based methodology. This paper aims to provide a summary on the advancement of VCObased δσ ADCs. The scope of this paper includes the basics and motivations behind the VCO-based ADCs, followed by a survey covering a wide range of architectures and circuit techniques in both continuous-time (CT) and discrete-time (DT) implementation, and will discuss the key insights behind the contributions and drawbacks of these architectures.

Original languageEnglish (US)
Pages (from-to)509-529
Number of pages21
JournalIEICE Transactions on Electronics
Issue number7
StatePublished - 2019
Externally publishedYes


  • Analog-to-digital converter
  • Ring oscillator
  • Time-domain signal processing
  • VCO-based ADC
  • Voltage-controlled-oscillator
  • δσ ADC

ASJC Scopus subject areas

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


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