A Repetitive Analog Pulse Time Computing Technique

This paper describes a computing technique which comprises three analog computing elements: the adder-subtractor, the multiplier-divider and the function generator, and one hybrid integrator. The inputs and outputs of all of these computing elements are in pulse-width form and therefore, can be switched with digital logic circuits. The combination of built-in storage capability and digital signal switching permits sequential operation. The adder, multiplier, and function generator are built around a novel precision pulse-width modulator which charges and discharges a capacitor and which requires neither precision resistorsnor precision capacitors. All computing elements operate with, or approach, an accuracy of one part in 1000 at a repetition frequency of 1KC. At lower repetition frequencies, higher accuracy may be possible.