Predistortion circuit, low-distortion power amplifier, and...

Details Predistortion circuit, low-distortion power amplifier, and... Predistortion circuit, low-distortion power amplifier, and...

2005-11-01

2005-11-01

Choe, Henry (Department: 2817)

Amplifiers

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

C330S280000, C375S297000

Reexamination Certificate

active

06960957

ABSTRACT:
An amplitude frequency characteristic adjustment circuit106is provided downstream of and connected to a distortion generation circuit105. An amplitude difference between low-frequency-side and high-frequency-side distortion voltages is adjusted by the amplitude frequency characteristic adjustment circuit106, and then their amplitudes and phases are adjusted by a vector adjustment circuit107. This configuration makes it possible to suppress simultaneously both of low-frequency-side and high-frequency-side distortion voltages of a distortion generated by a wide-band class-AB power amplifier even if they are different in amplitude and phase.

REFERENCES:
patent: 5252930 (1993-10-01), Blauvelt
patent: 5361156 (1994-11-01), Pidgeon
patent: 5999047 (1999-12-01), Zhang et al.
patent: 6188279 (2001-02-01), Yuen et al.
patent: 6211734 (2001-04-01), Ahn
patent: 6437644 (2002-08-01), Kenington

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