An active CMOS one-to-four power splitter for 60-GHz phased-array transmitter

This paper presents a V-band active one-to-four power splitter in 90-nm LP CMOS process for phased-array transmitter. This power splitter demonstrates a gain which is better than 0 dB from 57 to 65 GHz for each RF path. Besides, 0.75-dB gain imbalance and 4.3° phase imbalance are achieved. The isolation between two adjacent output ports is better than 15.2 dB, and the measured OP1dB is better than −2.67 dBm at 60 GHz while the dc power consumption is 40 mW with 2-V supply voltage.