An active 38 GHz differential power divider for automotive radar systems in 65-nm CMOS

Abstract

This paper presents an active 65-nm CMOS 38 GHz differential power divider which is used for power split and signal distribution from a PLL to sub-harmonic mixers of transmitter and receiver of a 77 GHz automotive radar system. The proposed divider consists of a differential passive transformer-based power splitter and three-stage common source power amplifiers. The measurement results show a 7 dB gain at 38 GHz, and a 3 dB bandwidth from 36 GHz to 46 GHz. The output compression point (OP1dB) and saturated output power are +5 dBm and +6 dBm, respectively. The isolation between input and output ports is better than 30 dB from 10 GHz to 80 GHz.