Patent ID: 6677870
Filing Date: 2004-01-13
Classification: H03F,H04B

Abstract:
A device for compensating for nonlinearity of an amplifier, comprising:a first downconverter for receiving a RF input signal and converting the frequency band of the RF input signal into an IF band to output an IF input signal; a predistortion unit for receiving the IF input signal, predistorting the IF input signal to compensate for the nonlinearity, and outputting an IF predistorted signal; an upconverter for converting the frequency band of the IF predistorted signal into a RF band to provide a RF predistorted signal to the amplifier; a coupler connected to an output terminal of the amplifier; and a second downconverter for receiving a RF output signal of the amplifier through said coupler and converting the frequency band of the RF output signal into the IF band to provide an IF output signal to said predistortion unit, wherein said predistortion unit determines a predistortion level based on the IF input signal and the IF output signal.