Shift register using negative resistance devices

摘要

A high speed digital static shift register includes a series-connected pair of resonant tunneling diodes (RTDs) 22, 24 to achieve a bistable operating state. A clocked switch 20 provides the means of setting the binary state of this bistable pair. In order for one bistable pair to drive a following pair, a method of providing isolation and gain using a buffer amplifier 26 between the two pairs of RTDs is also provided. In one embodiment, the buffer amplifier comprises enhancement FET 30 and depletion load FET 28. <IMAGE>