Low-Noise 45 GHz HEMT Mixer

Abstract

A low-noise 45 GHz mixer with a 3 GHz IF frequency has been developed using a GaAs HEMT device. This is the first active mixer reported above 30 GHz and the first HEMT mixer. It achieves unity gain over a 2 GHz bandwidth and a minimum SSB noise figure of 7.1 dB, including the noise from an IF amplifier.