A Novel Functional Logic Circuit Using Resonant-Tunneling Devices for Multiple-Valued Logic Applications

Abstract
We have demonstrated a novel functional logic circuit using resonant-tunneling devices. By integrating six InGaAs-based resonant-tunneling diodes (RTDs) and one HEMT on an InP substrate, we achieved room-temperature operation of an analog-to-quaternary quantizer, or an inverter in 4-valued logic. The circuit is suitable for multiple-valued logic applications because it exhibits multiple thresholds as well as multilevel output using a simple circuit configuration.