State holding circuit using heterojunction bipolartransistors and resonant tunnelling diodes

Abstract
A state holding circuit, similar to the Muller C-element used as a latch, a register or a counter, has been successfully fabricated using GaAs/AlGaAs heterostructures grown by molecular beam epitaxy (MBE). Using the negative resistance in a resonant tunnel diode, the circuit has a simpler configuration than the C-element and the potential for use in high speed circuits.