Tunneling Devices and their Applications in Ultra-Fast and Super-Dense Digital Circuits.

The purpose of this program was to demonstrate the capabilities of NDR device for the design and fabrication of high-functionality for the design and fabrication of high-functionality digital circuits. Several basic circuit functions have been demonstrated using RTD-HBT devices and extensive software for CAD of various types of circuits including adders a correlators and multivalued logic circuits was developed and employed to estimate power/speed tradeoffs in various logic circuits. Several Resonant Tunneling devices were fabricated including RTD's, RHET's, Esaki diodes and others. These diodes were then employed to demonstrate various logic functions such as AND, XNOR, Flip Flops and others. A Monolithic RTBT circuit to demonstrate a minority gate was also fabricated and demonstrated.