"A survey of voltage-controlled-oscillator-based ΔΣ ADCs" by Yi Zhong and Nan Sun

Article Title

A survey of voltage-controlled-oscillator-based ΔΣ ADCs

Authors

Yi Zhong, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China
Nan Sun, Department of Electronic Engineering, Tsinghua University, Beijing 100084, China;Department of Electrical and Computer Engineering, The University of Texas at Austin, Austin, TX 78712, USA

Keywords

Voltage-Controlled Oscillator (VCO), Analog-to-Digital Converter (ADC), oversampling (ΔΣ) ADC, time-domain signal processing, VCO-based ΔΣ ADC

Abstract

The benefits of technology scaling have fueled interest in realizing time-domain oversampling (Δ⁢Σ) of Analog-to-Digital Converters (ADCs). Voltage-Controlled Oscillators (VCO) are increasingly used to design Δ⁢Σ ADCs because of their simplicity, high digitization, and low-voltage tolerance, making them a promising candidate to replace the classical Operational Transconductance Amplifier (OTA) in Δ⁢Σ ADC design. This work aims to provide a summary of the fully VCO-based Δ⁢Σ ADCs that are highly digital and scaling-friendly. This work presents a review of first-order and high-order VCO-based Δ⁢Σ ADCs with several techniques and architectures to mitigate the nonidealities introduced by VCO, achieving outstanding power efficiency. The contributions and drawbacks of these techniques and architectures are also discussed.

Recommended Citation

Zhong, Yi and Sun, Nan (2022) "A survey of voltage-controlled-oscillator-based ΔΣ ADCs," Tsinghua Science and Technology: Vol. 27: Iss. 3, Article 3.
DOI: https://doi.org/10.26599/TST.2021.9010037
Available at: https://dc.tsinghuajournals.com/tsinghua-science-and-technology/vol27/iss3/3

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