A/D converter using InGaAs/InAlAs resonant-tunneling diodes

A novel A/D (analog/digital) converter based on the multiwell resonant-tunneling diode (RTD) is described. By using RTDs, the A/D circuit complexity can be reduced. The authors simulated the performance of a 4-bit A/D converter digitizing a triangular wave with the digital output changing at a 30-GHz rate. The results show that the approach holds the promise of greatly increased speed and reduced circuit complexity and power in comparison to state-of-the-art flash A/Ds. The results from breadboard circuits and SPICE3 simulations are very encouraging