An improved simulation of pulse propagation between integrated digital circuits is presented. Two novel improvements associated with the inverse Laplace transform used are presented; 1) the introduction of two-dimensional weight factors σn,mand 2) the use of a shifting parameter a. The algorithm proposed is very fast and saves considerably on computer memory. Fast Fourier transform (FFT) techniques are also employed. The computed results agree well with the experimental observations using TTL gates. The technique deals with arbitrary input waveforms, lossy lines, aperiodic tap-off loads, and is extended to large large-scale integrated (LSI) digital systems and crosstalk prediction.

Abstract—The charge-storage subharmonic parametric oscillator may be switched from one state to the other within one cycle of pump voltage. This property is used in the design and construction of a 6-element delay line. This delay line is shown to perform predictably when the elements are connected in a loop to give a self- switching arrangement.