A 77 GHz GaAs pHEMT transceiver MMIC for automotive sensor applications

A very compact coplanar transceiver MMIC using space-saving dual-gate pHEMTs has been developed for an FMCW radar system. The chip consists of a two-stage medium power amplifier, a single-ended resistive mixer, a rat-race coupler and a single-stage high-gain amplifier, based on 0.15 /spl mu/m GaAs pHEMT technology. An output power of 10 dBm and a conversion loss of 1.5 dB were obtained at 77 GHz. The over-all chip size is only 1.75/spl times/1.75 mm/sup 2/.