DC-8 GHz 11 dB Gain GaInP/GaAs HBT Double balanced Gilbert Micromixer

A wideband GaInP/GaAs HBT micromixer is demonstrated from DC to 8 GHz with 11 dB single-ended conversion gain. The input return loss is better than 10 dB for frequencies up to 9 GHz. The single-to-differential input stage in Gilbert micromixer renders good wideband frequency response and eliminates the need for common mode rejection. P1dB = -7 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.