JSSC 2019第10期Data Converters40nmSAR ADCOp-Amp

A Calibration-Free 13-Bit 10-MSs Full-Analog SAR ADC With Continuous-Time Feedfo

一种无需校准的13位10MS/s全模拟SAR ADC，采用连续时间前馈级联运放和自触发放大再生操作。

40nm CMOS, 13-bit, 10-MS/s

SAR ADC全模拟连续时间前馈再生放大器无需校准

▸连续时间前馈级联（CTFC）运放增强残余功率

▸基于逆变器的再生放大器（IRA）零交叉检测器（ZCD）

▸LSB重复技术消除偏移不匹配

Abstract

This paper presents a calibration-free 13-bit 10-MS/s full-analog successive-approximation-register analog-to- digital converter (SAR ADC) in 40-nm CMOS, which fully utilizes the timing and power budgets in a bit-conversion cycle by eliminating the digital circuits entirely. Continuous- time feedforward cascaded (CTFC) op-amps are proposed to enhance the residue power without the necessity of high-precision quantizers. As opposed to the residue ampliﬁers (RAs) in multi- step/pipelined ADCs, the