A 60 GHz Linear Power Amplifier with Embedded Switch in 65nm CMOS for Phased Array System

This paper presents a 60GHz power amplifier (PA) with embedded transmit/receive (T/R) switch in 65nm CMOS for phased array system. The current-type power combining technique is employed to improve the output power and power efficiency of the PA. Based on the AM-PM responses of the gain stages under different biasing conditions, an AM-PM compensation technique is proposed. The T/R switch is included in the output matching network of the PA, which only degrades linearity of the PA by 0.33 dB. With the proposed T/R switch, the PA achieves a 22.5dB power gain, a 10dBm OP1dB and a 15.76 dBm output power with a peak power-added efficiency (PAE
max
) of 13.6% at 60 GHz. Thanks to the proposed technique, the AM-PM at 60 GHz is less than 1.5° at P1dB.