Class D amplifier system

Details Class D amplifier system Class D amplifier system

1978-04-19

1979-12-11

Dahl, Lawrence J.

Amplifiers

Modulator-demodulator-type amplifier

330251, 330207A, 330302, H03F 338

Patent

active

041785568

ABSTRACT:
In a Class D amplifier system comprising a pulse width modulator for pulse width modulating with an audio signal a carrier signal having a frequency higher than that of the audio signal, an output switching amplifier connected to the modulator, and a lowpass filter connected to the output amplifier to supply a demodulated audio signal to a load in which a trap circuit resonant at a carrier signal frequency is provided in the lowpass filter to permit part of an output signal from the trap circuit which is free from a carrier signal component to be negative-fed back to the pulse width modulator.

REFERENCES:
patent: 4021745 (1977-05-01), Suzuki et al.
patent: 4059807 (1977-11-01), Hamada

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