Low-voltage pipelined ADC using opamp-reset switching technique

Abstract

A low-voltage opamp-reset switching technique (ORST) which avoids clock boosting/bootstrapping, switched-opamp, and threshold voltage scaling is presented. The switching technique is applied to the design of a 10-bit 25 MSPS pipelined ADC. The prototype ADC demonstrates 55 dB SNR, 55 dB SFDR, and 48 dB SNDR at 1.4 V power supply. The ADC operates down to 1.3 V power supply (|V/sub TH,P/|=0-9 V) with 5 dB degradation in performance. Maximum operating frequency is 32 MSPS. The ORST is fully compatible with future low-voltage submicron CMOS processes.