SPREAD SPECTRUM MODULATION CIRCUIT, VARIABLE FREQUENCY TRIANGULAR WAVE GENERATOR, AND SIGNAL PROCESSING METHOD

摘要

A spread spectrum modulation circuit, a variable frequency triangular wave generator and a signal processing method are provided. The spread spectrum modulation circuit includes a variable frequency triangular wave generator, a first comparator, and a second comparator. The variable frequency triangular wave generator connects with the first comparator and the second comparator respectively. The first comparator and the second comparator generate a pulse width modulation (PWM) signal, based on an input signal and a variable frequency triangular wave signal which is input by the variable frequency triangular wave generator. The circuit controls varying of capacitances by using a random signal to generate a triangular wave circuit, and the frequency of the triangular wave circuit is variable. The structure of the circuit is simple, and the electromagnetic interference is reduced in an effective manner.