IEICE Electronics Express
Online ISSN : 1349-2543
LETTER
A PVT insensitive boosted charge transfer for high speed charge-domain pipelined ADCs
Zhenhai ChenZongguang YuSongren HuangHong ZhangHuicai Ji
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JOURNALS FREE ACCESS

2012 Volume 9 Issue 6 Pages 565-571

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Abstract

A process, voltage, temperature (PVT) insensitive boosted charge transfer (BCT) circuit for charge-domain (CD) pipelined analog-to-digital converters (ADC) is presented. The output charge of existing BCT varies extensively with PVT variation, leading to large common-mode charge errors in each differential BCT stage when used in CD pipelined ADCs. Therefore, complicate common-mode control circuits must be adopted to stabilize the common-mode charge of each stage, which consumes large power and chip area. The proposed BCT circuit employs a differential difference amplifier and a differential voltage reference to reject the charge errors caused by PVT variations. A 125-MSPS, 10-bit CD pipelined ADC without common-mode control circuit is implemented based on the proposed BCT, consuming only 27mW from a 1.8V supply.

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© 2012 by The Institute of Electronics, Information and Communication Engineers
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