Pulse-width modulation circuit

摘要

A pulse-width modulation circuit of self-oscillation type produces a pulse-width modulated signal having a pulse width corresponding to an amplitude of an analog input signal. An integrator having an amplifier and at least one capacitor produces a triangle-wave signal. A comparator compares the triangle-wave signal with a reference voltage to generate a pulse signal. A delay circuit produces a delayed pulse signal in response to the pulse signal generated by the comparator. A feedback circuit feeds the delayed pulse signal back to an input terminal of the amplifier so that the self-oscillation is effected. The pulse-width modulated signal is derived from an output terminal of the delay circuit.