Power amplifier

Details Power amplifier Power amplifier

2005-12-06

2005-12-06

Choe, Henry (Department: 2817)

Amplifiers

Hum or noise or distortion bucking introduced into signal...

C330S151000

Reexamination Certificate

active

06972621

ABSTRACT:
A power amplifier capable of compensating for distortion by pre-distortion and achieving a large distortion suppressing effect even if IM3L components and IM3U components occurring at the power amplifier have a large level difference. A power amplifying circuit117amplifies an original signal. An envelope detector119generates an envelope signal having components identical to envelope components included in the original signal. Based on the original signal a distortion signal generating circuit112generates a distortion signal for canceling distortion components occurring while the original signal is amplified by the power amplifying circuit117. In a power combiner116, the envelope signal is injected to the original signal, thereby eliminating the asymmetric characteristic of the distortion components. In the power amplifying circuit117, the distortion signal is injected to the original signal, thereby suppressing the distortion components.

REFERENCES:
patent: 5644268 (1997-07-01), Hang
patent: 6714073 (2004-03-01), Suto et al.
patent: 6720829 (2004-04-01), Ishida et al.
patent: 2000-261252 (2000-09-01), None

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