Pulse width modulator with automatic gain control over-voltage m

Details Pulse width modulator with automatic gain control over-voltage m Pulse width modulator with automatic gain control over-voltage m

1998-02-25

1999-06-29

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330207A, H03F 338

Patent

active

059173696

ABSTRACT:
A pulse-width modulation (PWM) circuit in a Class D audio amplifier includes output-limiting logic and an automatic gain control (AGC) circuit. When an out-of-range, or overmodulated, input signal is received by the PWM, mono-stable multivibrator circuits provide discharge pulses that ensure that the PWM output will not spend excessive time in a single state. By using discrete mono-stable multivibrators, uniform and repeatable pulses can be generated at precise intervals. In addition, when an out-of-range input signal is detected, the AGC circuit lowers the gain on the input signal until it falls within the acceptable range of the PWM, enabling more faithful reproduction of the original signal.

REFERENCES:
patent: 4240036 (1980-12-01), Kohler
patent: 5014016 (1991-05-01), Anderson
patent: 5767740 (1998-06-01), Fogg
patent: 5805020 (1998-09-01), Danz et al.

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