Pulse-width modulation circuit

Details Pulse-width modulation circuit Pulse-width modulation circuit

1983-09-28

1985-07-23

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330251, H03F 338

Patent

active

045310963

ABSTRACT:
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.

REFERENCES:
patent: 3537022 (1970-10-01), Regan
Geelen "Self-Oscillating PWM Amplifier", Elektor, vol. 5, No. 9, Sep. 1979, pp. 946-948.

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