Some New High-Speed Tunnel-Diode Logic Circuits

Several high-speed tunnel-diode logic circuits are presented which perform majority-type logic or majority-type logic with inversion, and make use of a multiphase sinusoidal power supply to obtain signal directivity. Laboratory results are presented which show operation of these circuits at a 125 Mc/sec pulse repetition rate with 2 nsec delay per logical decision. The circuits have also been operated at 250 Mc/sec. A comparison which is made between these circuits and some of the tunnel-diode logic circuits previously reported in the literature reveals certain system advantages of the new circuits. Preliminary results of both analog and digital computer analyses of the systems of nonlinear differential equations which describe these circuits are presented. These results have been in excellent agreement with those found in the laboratory. A full serial binary adder is described which produces a carry output in 2 nsec and the sum output in 4 nsec.