Distortion compensating amplifier device, amplifier system,...

Details Distortion compensating amplifier device, amplifier system,... Distortion compensating amplifier device, amplifier system,...

2005-09-27

2005-09-27

Nguyen, Khanh V. (Department: 2817)

Amplifiers

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

C330S002000, C375S297000, C455S063100

Reexamination Certificate

active

06949976

ABSTRACT:
A distortion compensating amplifier device is disclosed that maintains uniform delay amounts between a transmission input signal and a transmission output signal, even if there is a change in the device characteristics. The distortion compensating amplifier device of a digital predistortion type includes a second delay circuit that delays the transmission input signal; a distortion compensating circuit that performs predistortion compensation on the delayed signal, using a distortion compensating parameter; an amplifier that amplifies the signal subjected to the predistortion compensation; a first delay circuit that further delays the signal delayed by the second delay circuit; and a calculator that calculates the distortion compensating parameter to be used in the predistortion compensation, based on the difference between the signal output from the first delay circuit and the amplified signal.

REFERENCES:
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patent: 2001/0005402 (2001-06-01), Nagatani et al.
patent: 2001/0051504 (2001-12-01), Kubo et al.
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International Search Report dated Jan. 21, 2003.

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