DIGITAL PREDISTORTION CIRCUIT WITH EXTENDED OPERATING RANGE AND A METHOD THEREOF
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United States of America Patent
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Issued Date -
Feb 9, 2012
app pub date -
Mar 9, 2009
filing date -
Mar 9, 2009
priority date (Note) -
Abandoned
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Abstract
A digital predistortion circuit and method with extended operating range includes a predistortion function, a D/A converter, a multiplier for performing frequency translation and a power amplifier. The digital predistortion circuit includes a multiplier for receiving a signal to be transmitted and a gain correction factor, multiplying the gain correction factor with the signal to be transmitted, and outputting a result of the multiplication to the predistortion function, as well as a device for calculating the gain correction factor by using a predetermined reference gain and an estimated gain of the power amplifier, and outputting the calculated gain correction factor to the multiplier, whereby a gain of the power amplifier is quickly corrected. The digital predistortion circuit and the method thereof produce acceptable results for a more expanded range of TX power levels.
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