Filterless class D power amplifier

Details Filterless class D power amplifier Filterless class D power amplifier

2008-04-08

2008-04-08

Mottola, Steven J. (Department: 2817)

Amplifiers

Modulator-demodulator-type amplifier

C330S20700P

Reexamination Certificate

active

07355473

ABSTRACT:
A double reference wave modulation scheme for filterless power amplifiers is disclosed for reducing EMI. In the filterless power amplifier, differential outputs for driving load impedance are corrected based on input audio signals by the error amplifier. Reference wave generators generate reference waves. Comparators are responsive to the reference waves and the input audio signal. Operation states of the switching unit are decided based on output signals of the comparators and the switching unit output the differential output. Besides, a feedback unit feeds the differential output back to the error amplifier. By this configuration, complex control logic is not needed.

REFERENCES:
patent: 5672998 (1997-09-01), Wittlinger
patent: 5805020 (1998-09-01), Danz et al.
patent: 6249182 (2001-06-01), Pullen
patent: 6262632 (2001-07-01), Corsi et al.
patent: 6420930 (2002-07-01), Takagishi
patent: 6614297 (2003-09-01), Score et al.

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