DC to 8 GHz 11 dB gain Gilbert micromixer using GaInP/GaAs HBT technology

A wideband GaInP/GaAs heterojunction bipolar transistor (HBT) micromixer from DC to 8 GHz with 11 dB single-ended conversion gain is demonstrated. The input return loss is better than 10 dB for frequencies up to 9 GHz. The single-to-differential input stage in a Gilbert micromixer renders good wideband frequency response and eliminates the need for common-mode rejection. IP1dB=−17 dBm and IIP3=−7 dBm are achieved for a small local oscillator power of −2 dBm when LO=5.35 GHz and RF=5.7 GHz.