Sine wave generator

Abstract

A sine wave generator circuit for providing, as its output, a substantially perfect sine wave signal includes a multiplier responsive to first input and second input signals of varying magnitude for providing as its output the sine wave signal as a function of the two input signals. There is further included a first feedback circuit path connected between the output and one of the inputs of the multiplier which includes a resistance-capacitance network for providing a phase delayed representation of the output signal as the first of the input signals. The amount of phase delay is determined by the relative values of the resistance-capacitance network and determines the frequency of the sine wave output. Further included is a reference signal the magnitude of which will determine the magnitude of the sine wave output signal. The reference signal is applied to a second feedback circuit path connected between the multiplier output and the other one of its inputs. This second feedback path includes a bridge circuit, for providing an intermediate signal which is proportional to the absolute value of the sine wave output, and an integrating circuit which integrates the difference between the reference signal and the intermediate signal to provide an integrated signal which serves as the second input to the multiplier.

Dependencies are inferred from the claim text.