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JSSC 2021第6期Data Converters65nmDelta-Sigma ADCOp-Amp

09 A 134-μW 994-dB SNDR Audio Continuous-Time Delta-Sigma Modulator With Chopped

一种采用负阻斩波和三电平FIR-DAC的低功耗音频连续时间ΔΣ调制器
65nm CMOS, 134μW功耗, 99.4dB SNDR, 24kHz带宽
连续时间ΔΣ调制器负阻斩波FIR-DAC低功耗音频ADC
▸使用负阻斩波技术降低第一运放噪声
▸采用三电平FIR-DAC实现高线性反馈
▸通过负阻斩波消除1/f噪声
Abstract
This article presents a low-power audio continuous- time delta-sigma modulator (CTDSM) that employs a chopped negative-R and a tri-level finite impulse-response (FIR) DAC. The noise of the first opamp is mitigated by using a negative-R at the virtual ground of the first integrator, and the negative-R is then chopped to remove the intrinsic 1 / f noise of the negative-R. The highly linear feedback DAC is realized with a 6-tap tri- level FIR-DAC whose inter-symbol interference (ISI) is kept less than