Power amplifier apparatus and DC component removing method

Details Power amplifier apparatus and DC component removing method Power amplifier apparatus and DC component removing method

2008-01-01

2008-01-01

Nguyen, Khanh Van (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including class d amplifier

C330S20700P

Reexamination Certificate

active

07315209

ABSTRACT:
A power amplifier apparatus includes a dither superimposing unit superimposing DC dither on a digital signal; a switching signal generating unit converting the digital signal on which the DC dither is superimposed by the dither superimposing unit to a pair of drive pulses on high and low sides having opposite levels; and a cancel signal generating unit generating a cancel signal to cancel a DC component caused by the DC dither by changing a ratio of pulse widths of the drive pulses on the high and low sides generated by the switching signal generating unit.

REFERENCES:
patent: 6172628 (2001-01-01), Sculley et al.
patent: 6671329 (2003-12-01), Lenz
patent: 7209002 (2007-04-01), Ohkuri et al.
patent: WO 2004/057757 (2004-07-01), None
Patent Abstracts of Japan, JP 2004-072707, Mar. 4, 2004.

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