A Millimeter-Wave Field-Effect Transistor Based on a Pseudomorphic Heterostructure with an Additional Potential Barrier

Abstract

Abstract: We report on the results of investigations of the millimeter-wave field-effect transistors with a 0.14‑μm T-shaped gate with pseudomorphic Al0.3Ga0.7As–In0.22Ga0.78As–Al0.3Ga0.7As heterostructures with additional potential barriers based on a two-sided donor–acceptor channel doping. At a frequency of 40 GHz in a wide gate voltage range, the maximum stable gain of more than 15 dB has been obtained. The maximum oscillation frequency of the device is about 250 GHz, the open-channel specific current density is about 0.7 A/mm, and the gate–drain breakdown voltage is 22–31 V for different versions.