20 GHz 5 dB gain analog multipliers with AlGaAs/GaAs HBTs

DC-to-above-20 GHz monolithic Gilbert Cell analog multipliers have been developed using AlGaAs/GaAs heterojunction bipolar transistor (HBT) technology. As a double balance active mixer, it exhibits very high conversion gain of above +5 dB with extremely high local oscillator-intermediate frequency (LO-IF) isolation of 33 dB for Rf/LO inputs up to 20 GHz. As a detection mixer in coherent optical heterodyne receivers, it can operate for RF/Lo inputs up to 15 GHz under a less than -7.5 dBm LO input condition. >