A Wideband Blocker-Tolerant Receiver with High-Q RF-Input Selectivity and <-80dBm LO Leakage voltage swing at the drain of BPCG. The noise and IM3 generated in the BPCG circuit are ultimately cancelled at BB output upon optimum gain and phase matching between CG and NC downconversion paths.

📋 论文概要

该论文提出了一种宽带、抗阻塞的接收机，通过引入相位超前技术校正BP中心频率偏移，并利用N-path陷波滤波器实现高Q RF输入选择性和超低LO泄漏。

💡 主要创新点

• 利用反馈BB信号到相邻分支的相位矫正方法，抵消寄生相位延迟
• 采用N-path陷波滤波器作为阻塞吸收器，在大电压摆幅下仍保持线性度
• 实现<-80dBm的极低LO泄漏

🏷 关键词

📄 原文摘要

capacitances along the BPCG loop cause slight shift of BP center frequency seen at RF_in. By feeding amplified BB signals within the notch filter to adjacent branches (e.g., A to B in Fig. 28.7.2), phase lead is introduced to counter the parasitic phase delay and correct the center frequency shift. The amount of phase lead is controlled by the gain of the amplifiers within the notch filter. The blocker sink is realized by an N-path notch filter around an RF gain stage. The voltage swing at the output of the blocker sink is large but does not pose any linearity concern since it is not on the signal path. Downconversions in both CG and NC paths employ 8-phase LOs to reject the 3rd and 5th LO harmonics, thereby improving NF. A harmonic-rejection recombination ratio of 29:12 is employed in BB amplifiers to approximate the ideal ratio of 1+√2. The downconverted outputs of the CG and NC paths are combined for noise and IM3 cancellation. The best

👥 作者与机构

Huan Wang, Zisong Wang, Payam Heydari, Figure 28.7.2 shows the complete block diagram of the WB-RX. The parasitic