High efficiency power amplifying apparatus

Details High efficiency power amplifying apparatus High efficiency power amplifying apparatus

1999-03-31

2000-07-18

Pascal, Robert

Amplifiers

Modulator-demodulator-type amplifier

330207A, H03F 338

Patent

active

060912928

ABSTRACT:
A parallel, synchronously driven linear power amplifier (6) and class D power amplifier (2) form an equivalent active filter, minimizing the scale of the passive filter (3), and effectively suppressing high frequency noise. First to third muting circuits (17-19) are used when the power supply is turned on and off to interrupt signal supply from the signal input terminal, and control operation of the class D power amplifier (2) and linear voltage amplifier (15), thereby preventing extraneous irritating noises such as popping sounds from a loudspeaker.

REFERENCES:
patent: 4390849 (1983-06-01), Miskin
patent: 5847602 (1998-12-01), Su
patent: 5973556 (1999-10-01), Su

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