Class D amplifier capable of setting restraint power

Details Class D amplifier capable of setting restraint power Class D amplifier capable of setting restraint power

2011-08-16

2011-08-16

Nguyen, Khanh (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S251000

Reexamination Certificate

active

07999610

ABSTRACT:
A Class D amplifier capable of setting restraint power is provided, which comprises: an audio amplification unit, a pulse width modulation (PWM) unit, a first pre-drive unit, a second pre-drive unit, a first power transistor set, a second power transistor set and a power restraint unit. The power restraint unit has a comparator circuit and a power restraint circuit. The comparator circuit is configured to compare the level of first/second amplified audio signals against the level of a first reference voltage that is externally settable. When the high level of the first/second amplified audio signals is higher than the level of the first reference voltage, the comparator circuit outputs a first comparison signal and a second comparison signal to the power restraint circuit to restrain the power.

REFERENCES:
patent: 7463090 (2008-12-01), Kaiho et al.
patent: 7852156 (2010-12-01), Chen et al.

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