A basic technique is presented which enables the development of Esaki diode NOT-OR logic circuits. Two embodiments of the basic scheme are discussed, which, when combined with an OR-DELAY circuit, provide a logically complete system. Emphasis is placed on the more economical of the two embodiments. A tolerance analysis is included, which demonstrates that the technique enables the practical design of logic circuits. The requirements placed on Esaki diode characteristics, and the speed limitations of the circuits, are discussed. Examples of working circuits are shown, including photographs of voltage wave shapes.

The Esaki diode is a potentially low-cost, high-speed two-terminal device exhibiting a short-circuit-stable negative resistance over a portion of its volt-ampere characteristic. By proper biasing and loading, it can be used to perform power amplification and memory functions. In this paper, a variety of digital computer circuits (a result of an early exploratory program) is described which utilizes the above properties. In particular, shift registers, triggers, and counters are presented. The following shift registers are described: 1) A register which consists of one Esaki diode and one conventional diode per stage. Shifting is accomplished with a two-phase square-wave drive. The Esaki diode provides memory and power gain, and the conventional diode provides a unilateral flow of information. 2) A register which combines Esaki diodes with square-loop ferromagnetic cores. Again the Esaki diode provides memory and power gain. Upon application of a single-phase drive, the cores perform a gating operation depending upon the state of the diodes. 3) With the use of Esaki diode-transistor combinations, high-speed circuits are obtained which depend upon the Esaki diodes primarily for memory and the transistors for power gain and unilateral flow of information. The flip-flop and counter circuits to be presented are the following: 1) A binary counter using Esaki diodes with magnetic cores; 2) high-speed flipflops using Esaki diode-transistor combinations.