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A 154-ENOB Fourth-Order Truncation-Error- Shaping NS-SAR-Nested 16 Modulator Wit
一种高输入阻抗、宽线性输入范围的16调制器，用于生物医学信号采集。
94.5-dB SNDR, 1–500-Hz带宽, 600-mV PP输入, 174.3 dB FoM SNDR, 175.8 dB FoM DR, 208 MΩ@dc输入阻抗
生物医学信号采集噪声整形高输入阻抗截断误差整形SAR ADC
▸基于预采样的电荷转移减少技术提升输入阻抗
▸局部NS-SAR环路反馈实现截断误差整形
▸无需额外放大器的高效噪声整形
Abstract
This article presents a discrete-time 16 modulator
(DSM) with a wide linear input range and high input impedance
for biomedical signal acquisition. The proposed integrated circuit
(IC) is based on a 1st-order DSM with 2nd-order noise-shaping
(NS)-successive approximation (SAR) for high resolution with
high power efficiency, directly converting the small input signal
to digital. The first-stage integrator in the DSM is designed to
support not only for wide-input swing at low power consumption
but