Novel GaAs FET Phase Detector Operable to Ka Band

A new type of sampling-phase detector using a GaAs FET was developed. This SPD has approximately a 30 mV/rad detection sensitivity at 26.4 GHz with a 19 dBm 100 MHz reference frequency. Detection sensitivity depends on the FET bias voltage in a very unusual way. This paper describes the configuration of the SPD and experimental results of a 50 GHz phase locked oscillator using an oscillator doubler VCO and the SPD .