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A time-shifted correlated double sampling (CDS) technique is proposed in the design of a 10-bit 100-MS/s pipelined ADC. This technique significantly reduces the finite opamp gain error without compromising the conversion speed, allowing the active opamp blocks to be replaced by simple cascoded CMOS inverters. Both high-speed and low-power operation is achieved without compromising the accuracy requirement. An efficient common-mode voltage control is introduced for pseudodifferential architecture which can further reduce power consumption. Fabricated in a 0.18-/spl mu/m CMOS process, the prototype 10-bit pipelined ADC occupies 2.5 mm/sup 2/ of active die area. With 1-MHz input signal, it achieves 65-dB SFDR and 54-dB SNDR at 100MS/s. For 99-MHz input signal, the SFDR and SNDR are 63 and 51 dB, respectively. The total power consumption is 67 mW at 1.8-V supply, of which analog portion consumes 45 mW without any opamp current scaling down the pipeline.

A 1.8-V 67-mW 10-bit 100-MS/s pipelined ADC using time-shifted CDS technique