A high efficiency Si-CMOS power amplifier for 60 GHz band broadband wireless communication employing optimized transistor size

For small size and low cost mobile terminals on millimeter wave radio communication, we design and fabricate 60 GHz-band broadband power amplifier (PA) using a 90 nm silicon complementary metal oxide semiconductor (Si-CMOS) process. In designing high linear gain PA, transistor size optimization method of PA is used. Target output power is 7 dBm in single-end and 10 dBm in push-pull structure. With the transistor size optimization method, unit gate width is 2 μm and a number of gate fingers is 32, so total optimal gate width is 64 m. We fabricate the single-end PA and push-pull PA designed with this transistor size. The single-end PA has achieved 1 dB compression output power P _1dB of 7.3 dBm, saturation power P _sat of 10.2 dBm, linear gain G _L of 10.9 dB, peak power added efficiency PAE of 21.3% at 63 GHz, and a bandwidth over 7 dBm of 9 GHz. The push-pull PA has achieved P _1dB of 10.2 dBm, P _sat of 12.9 dBm, G _L of 13.1 dB, peak PAE of 25.4% at 63 GHz, and a bandwidth over 10 dBm of 10 GHz. These measurement results show the potentiality of high efficiency Si-CMOS PA for 60 GHz band broadband wireless communication applications.