A 60-GHz band CMOS phased array transmitter utilizing compact baseband phase shifters

A 60-GHz band phased array transmitter is developed based on 90-nm CMOS process featuring compact baseband phase shifters with ideally zero power consumption. The phase shifter changes an RF signal phase every pi/2 by switching baseband signal paths. The transmitter has 6 RF front-ends and 6 phase shifters to implement beam steering function for a 1 times 6 array antenna system. Each of the RF front-ends exhibits typically a power of 0 dBm at 1-dB compression point, a conversion gain of 15 dB, and a 3-dB bandwidth of 600 MHz. By controlling phase shifters, the beam steering from 0 to 60 degree is observed. The chip size is 5 mm times 2.5 mm. The circuit consumes 960 mW at 1.0 V supply.