Volume control in class D amplifier using variable supply...

Details Volume control in class D amplifier using variable supply... Volume control in class D amplifier using variable supply...

2007-01-09

2007-01-09

Pascal, Robert (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

Reexamination Certificate

active

11013990

ABSTRACT:
A Class D audio amplifier including a gain stabilization feedback loop in which volume control is achieved by varying the bus voltage. Changes in the bus voltage are compensated for by complementary changes in the gain of a compensation element in feedback loop so the signal level at the output of the Class D stage can be adjusted independent of the feedback. A digital attenuator can be employed ahead of the amplifier to shift the effective gain of the amplifier output to provide additional volume control range.

REFERENCES:
patent: 7049885 (2006-05-01), Ishizaki
patent: 2005/0162224 (2005-07-01), Kwong

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