InP/InGaAs-DHBT distributed amplifier MMICs exceeding 80 GHz bandwidth

Distributed amplifier MMICs with very large bandwidth were realized using an in-house InP/InGaAs double heterojunction bipolar transistor (DHBT) technology. A choice of two amplifiers is presented. The amplifiers achieve a 3-dB bandwidth of 85 GHz and 101 GHz and a gain of 10.5 dB and 9.5 dB, respectively. Both show an excellent input matching over the entire bandwidth and an output matching of better than -10 dB up to 85 GHz. The group delay, which is calculated from measured S-parameters, is flat up to 80 GHz.