An Ultra-Low Power E-band Low Noise Amplifier with Three Stacked Current Sharing Amplification Stages in 28-nm CMOS

This paper presents a differential ultra-low-power low noise amplifier (LNA) with stacked three-stage common-source (CS) amplification cells. A three-coil transformer is developed to boost each stage’s gm and reuse current, which renders high gain, low noise and low power consumption. The proposed LNA has been implemented in a 28-nm CMOS process, and achieves a peak gain of 13.48 dB and a minimum noise figure (NF) of 4.56 dB. The measured 3-dB gain bandwidth (BW3dB) is from 69.6 GHz to 76.2 GHz. The LNA consumes 3.64-mW power from a 1.4-V supply, and occupies 0.088 mm2 area excluding pads.