4.6dB/5.5dB NF and 6.5dB/21.5dB gain 2 stages and 6 stages 76-81GHz LNAs for radar application in 28nm RF CMOS FD-SOI

This paper presents fully integrated LNAs for 76GHz-81GHz automotive radar application. Unlike most of recent published LNAs operating at these frequencies based on positive feedback architectures, a pseudo-differential common source (PDCS) with inductive degeneration has been implemented using a gate-source extra capacitance to trade fT for input impedance. LNAs were processed in 28nm fully-depleted silicon-on-insulator (FD-SOI) CMOS with 1V supply voltage. The high gain LNA provides -18.8dBm IIP1 linearity, 21.5dB gain, 5.5dB NF with 25mW power consumption.