A Time-Interleaved Filtering-by-Aliasing Receiver Front-End with >70dB Suppression at <4×Bandwidth Frequency Offset

📋 论文概要

本文提出一种时间交织滤波-混叠接收机前端，利用采样积分-转储电路和周期性时变电阻实现等效FIR滤波，解决了传统N-path滤波匹配差和电荷域滤波噪声高的问题。该设计在小于4倍带宽的频偏处实现了超过70dB的阻塞抑制。

💡 主要创新点

• 提出时间交织滤波-混叠架构，结合采样积分与周期性时变电阻，实现尖锐的等效FIR滤波，同时改善匹配和噪声性能。
• 利用时间交织技术降低对器件匹配的要求，相比传统N-path和电荷域滤波，在保持高抑制的同时提升噪声和线性度。

📄 原文摘要

Programmable receiver front-ends have been a topic of enormous interest in recent years. Both N-path filtering [1,2] and charge-domain filtering [2] achieve sharp filtering but suffer from poor matching [1] or high noise figure (NF) [2]. Combining noise cancellation with the mixer-first architecture achieves low NF and high linearity [3], but only for far-out blockers. The Filtering-by-Aliasing (FA) approach uses a sampled integrate-and-dump circuit with an appropriately chosen periodically time-varying resistor, R(t)=R(t+TS), to realize an equivalent FIR filter with desired impulse response, g(τ) (Fig. 24.6.1) [4]. Sharp transition bands, good S11, and high linearity are achieved even for close-in blockers. Nevertheless, filter stopband attenuation (Astop) is limited since (1) the length of g(τ) is constrained to TS, and (2) R(t) itself is constrained due to S11 requirements. This may lead to residual blockers that

👥 作者与机构

Sameed Hameed, Sudhakar Pamarti

University of California, Los Angeles, CA