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JSSC 2020第9期Digital Circuits65nmNeural Network Accelerator

A 0032-mm² 433-fJStep 100-200-MHz IF 2-MHz Bandwidth Bandpass DSM Based on Passi

基于被动N路径滤波器的带通ΔΣ调制器,实现高能效和宽频调谐范围。
65nm CMOS, 0.032mm², 100-200MHz IF, 2MHz带宽, 55.5dB SNDR, 150µW
带通ΔΣ调制器被动N路径滤波器高能效宽频调谐小面积
创新点1:采用被动N路径滤波器实现谐振器,显著提升功率效率并减小面积(0.032 mm²),同时支持100-200 MHz宽中频调谐范围(方法创新)
创新点2:仅需单一开环放大器作为有源元件,通过全局负反馈和前置被动N路径滤波器降低输入幅度,减少功耗至150 µW并放宽开关设计约束(电路创新)
创新点3:建立线性周期时变系统模型,量化分析非理想特性,为被动N路径DSM设计提供理论框架(理论创新)
创新点4:在65nm CMOS工艺下实现433-fJ/step能效,SNDR达60.5 dB(175MHz时),Walden FoM为43.3 fJ/conv-step(性能创新)
Abstract
In this article, we demonstrate a bandpass (BP) delta–sigma modulator (DSM) using passive N-path filters to implement resonators for high power efficiency, wide intermediate-frequency (IF) tuning range, and small area. The fourth-order modulator loop requires only one active element: an open-loop amplifier. The input magnitude of the amplifier is small due to the modulator’s global negative feedback and the passive N-path filter preceding it. This lowers the power consumption of the amplifier and rela