60GHz quadrature doppler radar transceiver in a 0.25μm SiGe BiCMOS technology

A 60GHz Doppler radar for short-range presence detection applications in the unlicensed 60GHz band is described. The 1.1×2.1 mm² SiGe:C BiCMOS IC includes a 60GHz VCO, a polyphase filter for quadrature signal generation, a low-noise amplifier with current reuse quadrature down-conversion mixer and a power amplifier. The VCO can be tuned from 59.5–61.5GHz. The receiver quadrature accuracy is better than 27dB across a ±10MHz IF bandwidth. With a single-ended input drive of the differential input, the receiver achieves a conversion gain of 55dB and a DSB noise figure of 22.9dB. Assuming 4dBi antenna gains, the radar IC supports up to 5m range.