A 79-Ghz Bidirectional Pulse Radar System with Injection-Regenerative Receiver in 65 Nm CMOS

A 79-GHz fully-integrated bidirectional pulse radar system with injection-regenerative receiver is demonstrated in 65 nm CMOS. The novel design for the impedance transformation of PA/LNA improves the TX efficiency and RX noise figure significantly in comparison with the traditional RF switch. The injection-regenerative oscillator is proposed to increase the receiver gain as well as the system efficiency. The measured TX peak Pout and RX conversion gain are 9.2 dBm and 42 dB, respectively. Using an 8×8 patch antenna array with on board matching network to compensate bonding wire effect, the TX EIRP is 25 dBm with the beamwidth of 11.5° and 10° in E and H plane, respectively. The distance measurement for 0.3~1.5 m with the maximum error of less than 7.2 mm. The overall dc consumption is only 107 mW from a single 1.2 V supply under pulse modulation with 0.1% duty cycle.