A Nonlinear Modulator Using Delta Modulation Principles

A delta modulator in which the clock is replaced by voltage sources and the comparator is modified to have some controlled hysteresis is shown to behave like a relay-mode multivibrator whose "on" and " off" periods are functions of input voltages. Both approximate and exact analysis of the circuit are included. Under different input conditions, the circuit behaves as an A/\x7f/D converter or square law or linear frequency modulator and a reconstruction filter.