Gain control circuit for pulse width modulation amplifier

Details Gain control circuit for pulse width modulation amplifier Gain control circuit for pulse width modulation amplifier

1980-07-14

1983-02-01

Mullins, James B.

Amplifiers

Modulator-demodulator-type amplifier

330285, H03F 338

Patent

active

043718400

ABSTRACT:
An improved gain control circuit for a pulse width modulation amplifier (PWM amplifier) which comprises: a pulse width modulation circuit which modulates a carrier signal by an input signal to the PWM amplifier to make a pulse width modulated signal; a pulse amplification circuit for amplifying the pulse width modulated signal to generate an amplified pulse width modulated signal; and a low-pass filter circuit for extracting therefrom an output signal having the same waveform as the input signal, comprising variable voltage supplying means capable of supplying a variable voltage to the pulse amplification circuit whereby the gain of the PWM amplifier is controlled in accordance with the supply voltage applied to the pulse amplification circuit. Tha gain control circuit may preferably be used in a volume control circuit as well as a muting circuit in an audio signal amplifier.

REFERENCES:
patent: 2379484 (1945-07-01), Haynes
patent: 3551851 (1970-12-01), Engel

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