A Single-Supply CDAC-Based Buffer-Embedding SAR ADC With Skip-Reset Scheme Having Inherent Chopping Capability
- Authors
- Seo, Min-Jae; Jin, Dong-Hwan; Kim, Ye-Dam; Kim, Jong-Pal; Ryu, Seung-Tak
- Issue Date
- Oct-2020
- Publisher
- IEEE-INST ELECTRICAL ELECTRONICS ENGINEERS INC
- Keywords
- Analog-to-digital converter (ADC); capacitive-level shifting; delta (Delta) searching; loop-embedded input buffer; low power; push-pull source follower (SF); skip-reset (SR); successive approximation register (SAR)
- Citation
- IEEE JOURNAL OF SOLID-STATE CIRCUITS, v.55, no.10, pp.2660 - 2669
- Journal Title
- IEEE JOURNAL OF SOLID-STATE CIRCUITS
- Volume
- 55
- Number
- 10
- Start Page
- 2660
- End Page
- 2669
- URI
- https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83649
- DOI
- 10.1109/JSSC.2020.3006450
- ISSN
- 0018-9200
- Abstract
- This article presents a power-efficient buffer-embedding successive approximation register (SAR) analog-to-digital converter (ADC) that utilizes a core power supply for the source-follower buffer, having a rail-to-rail signal swing due to the capacitive-level shifting bias scheme. Also, to implement the switched-capacitor (SC) level-shifting bias scheme without bias leakage issue, a negative boosting circuit is proposed. The boosting circuit is designed without any reliability issue, even with the use of thin-oxide transistors. For low-power applications, such as the biomedical system and CMOS image sensor, the proposed ADC incorporates a skip-reset (SR) scheme, a low-power delta-readout method. In conjunction with 8x oversampling and the power-saving SR technique that has inherent chopping capability, a prototype SAR ADC fabricated in a 180-nm CMOS technology achieves a peak 74.8-dB signal-to-noise and distortion ratio (SNDR) and an 89.1-dB spurious free dynamic range (SFDR) for a 640-kHz bandwidth (BW) with an oversampling ratio (OSR) of 8, resulting in a Schreier figure of merit (FoM) of 167.3 dB. The chip area occupies 0.192 mm(2), and the power consumption is 180.1 mu W.
- Files in This Item
- There are no files associated with this item.
- Appears in
Collections - ETC > 1. Journal Articles
![qrcode](https://api.qrserver.com/v1/create-qr-code/?size=55x55&data=https://scholarworks.bwise.kr/gachon/handle/2020.sw.gachon/83649)
Items in ScholarWorks are protected by copyright, with all rights reserved, unless otherwise indicated.