Distortion compensating amplifier device, amplifier system, and wireless base station
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United States of America Patent
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Sep 27, 2005
Grant Date -
May 19, 2005
app pub date -
Dec 23, 2004
filing date -
Oct 10, 2002
priority date (Note) -
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status (Latency Note)
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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.
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