This paper, first, presents a Linear Periodically Time-Variant (LPTV) analysis of a general system with an arbitrary number of n-path filters, that the results of mathematical derivations are verified through simulation. Then, a noise-canceling receiver is presented with 3 stages of the 8-path filter. In the structure of this receiver, two filters are used for noise-canceling, and the third filter is used as a Miller bandpass filter to increases the selectivity. The proposed circuit is designed with 65 nm RF CMOS technology and the simulation results show > 44 dB gain, 3–4.5 dB NF, and 0 dBm out-of-band IIP3 at the 50 MHz offset, while in 0.3–3 GHz functional frequency, consuming just 15.52mW of power.

本文首先介绍了具有任意数量的n路径滤波器的一般系统的线性周期性时变（LPTV）分析，并通过仿真验证了数学推导的结果。然后，给出了具有3级8路径滤波器的降噪接收机。在此接收器的结构中，两个滤波器用于消除噪声，第三个滤波器用作Miller带通滤波器以提高选择性。拟议的电路采用65 nm RF CMOS技术进行设计，仿真结果表明，在50 MHz偏移下，功能频率为0.3–3 GHz时，增益> 44 dB，3–4.5 dB NF和0 dBm带外IIP3 ，仅消耗15.52mW的功率。