一款20～25 GHz基于变压器的改进型多路径噪声抵消低噪声放大器OA

This paper presents a 20～25 GHz low noise amplifier that employs a transformer-based improved multi-path noise-canceling(IMNC)architecture.The proposed IMNC approach addresses key limitations of the conventional dual-path noise-canceling(DPNC)technique that employs common-source(CS)and common-gate(CG)stages to suppress each other's noise.In DPNC designs,noise from the CG stage cannot be fully canceled,and increasing CG transconductance to enhance CS-stage noise suppression results in a tradeoff between noise performance and power consumption.To overcome these limitations,the proposed IMNC architecture introduces a three-coil transformer that passively boosts the gain of the CG stage,thereby improving CS-stage noise cancellation without additional power consumption.The transformer also provides an additional noise-canceling path that enables partial self-cancellation of CG stage noise.These improvements lead to better noise performance and power efficiency compared to the conventional DPNC approach.Fabricated in a 40 nm complementary metal oxide semiconductor(CMOS)process,the proposed low noise amplifier achieves a peak gain of 14.5 dB,a 3 dB bandwidth of 5.1 GHz spanning 20 to 25 GHz,and a minimum noise figure(NF)of 2.0 dB,while consuming 22.4 mW of power and occupying a core area of 0.16 mm2.