Amplifiers – Hum or noise or distortion bucking introduced into signal...
Reexamination Certificate
2007-12-14
2010-02-16
Nguyen, Patricia (Department: 2817)
Amplifiers
Hum or noise or distortion bucking introduced into signal...
C330S278000, C330S289000
Reexamination Certificate
active
07663436
ABSTRACT:
A power amplifier negates a memory effect and is applied a linearizer using a digital predistortion system even in an inexpensive device. The power amplifier compares an input signal power against a sampled component of an output power, and provides predistortion to the input signal power so as to minimize a difference as a result of the comparison. The power amplifier comprises a gain lookup table storing a gain coefficient value corresponding to a temperature address determined for an input power; a phase lookup table storing a phase coefficient value corresponding to the temperature address determined for the input power; a transversal filter, which is input with the input power, and which outputs the temperature address; and a coefficient multiplier modulating the input signal using a gain coefficient value and a phase coefficient value, which correspond to the temperature address and which are read out from the gain coefficient lookup table and the phase lookup table.
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Supplementary European Search Report corresponding to EP Application No. 05765182.0-1233 dated Jul. 16, 2008.
European Patent Office Action based on application No. 05765182.0-1233 (dated Oct. 22, 2008).
Maniwa Toru
Oishi Yasuyuki
Takano Takeshi
Fujitsu Limited
Hanify & King, PC
Nguyen Patricia
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