A 77-GHz LNA for automotive radar application

This paper presents a 77-GHz low-noise amplifier implemented in 65-nm digital CMOS process for automotive radar application. Due to the lack of high frequency transistor model, curve fitting of the measured S-parameters has been done to obtain accurate simulation results. The transistor model is modified with additional parasitic extraction and bias-dependent components. The LNA is composed of three cascode stages connected in cascade and the matching networks are composed of microstrip transmission lines and MOM capacitors. The 77-GHz LNA achieves a power gain of 17.6 dB and average noise figure of 5.9 dB. The 3-dB bandwidth of the LNA is from 70 GHz to 87 GHz. The measured input and output return loss is better than 10 dB at 77 GHz. The LNA consumes 20 mW from a 1.2 V supply voltage.