A 70-GHz LO Phase-Shifting Bidirectional Frontend Using Linear Coupled Oscillators

A 70-GHz two-element bidirectional frontend is demonstrated with linear coupled oscillators in a 90-nm silicon-germanium BiCMOS process. The transmitter has a measured peak output power of 7.2 dBm and a peak conversion gain of 14.5 dB while consuming 47 mA from a 1.8-V supply. The receiver has a peak conversion gain of 9.9 dB and a minimum noise figure of 8.6 dB with a nominal current consumption of 18 mA from a 1.5-V supply. The frontend is integrated with a two-element linear coupled oscillator array and achieves a maximum phase scanning of ±80°.