Digital audio amplifier including phase lead-lag compensator...

Details Digital audio amplifier including phase lead-lag compensator... Digital audio amplifier including phase lead-lag compensator...

2007-03-27

2007-03-27

Mottola, Steven J. (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

Reexamination Certificate

active

10530977

ABSTRACT:
Provided is a digital audio amplifier capable of increasing self-oscillation frequency by using a phase lead-lag compensator. The digital audio amplifier includes the phase lead-lag compensator which increases the self-oscillation frequency by lead-lag-compensating for the phase of an output signal and making a feedback of the compensated output signal. In addition, the digital audio amplifier further includes a bandwidth control means which controls the bandwidth of an error amplifier. Accordingly, the digital audio amplifier can adjust the self-oscillation frequency and reduce the extent to which the self-oscillation frequency varies in accordance with the variation of the output signal by using the bandwidth control means that inserts a pole into the error amplifier.

REFERENCES:
patent: 4464634 (1984-08-01), Velazquez
patent: 5898340 (1999-04-01), Chatterjee
patent: 6392476 (2002-05-01), Rodriguez
patent: 2002/0097091 (2002-07-01), Takagishi
patent: 2000-184500 (2000-06-01), None
PCT International Search Report, Jan. 19, 2006.

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