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Advances in Voltage-Controlled-Oscillator-Based ΔΣ ADCs
Shaolan LI Arindam SANYAL Kyoungtae LEE Yeonam YOON Xiyuan TANG Yi ZHONG Kareem RAGAB Nan SUN
IEICE TRANSACTIONS on Electronics
Publication Date: 2019/07/01
Online ISSN: 1745-1353
Type of Manuscript: INVITED PAPER (Special Section on Analog Circuits and Their Application Technologies)
voltage-controlled-oscillator, ring oscillator, analog-to-digital converter, time-domain signal processing, VCO-based ADC, ΔΣ ADC,
Full Text: FreePDF(1.6MB)
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 VCO-based 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.