Fabrication and characterization of RTD-HBT inverter

We report on the first thorough study of InP-based static inverters using RTD/HBT monolithic integration technology. RTD-based logic circuits have been widely studied because of their abilities to achieve high-speed operations and reduce circuit complexity. In this paper, we investigate a static inverter in order to explore RTD-based logic circuit behavior. Studies on output characteristics and power dissipation at high frequencies are included. In order to determine the maximum operating speed of the inverters, ring oscillators based on three stages of static inverters have been fabricated and measured.