Patent ID: 7139327

Claim:
A method for reducing spurious emissions in an amplified signal by applying pre-distortion, whose magnitude is frequency-dependent, to an input signal to generate a pre-distorted signal, such that, when the pre-distorted signal is applied to an amplifier to generate the amplified signal, the pre-distortion reduces spurious emissions in the amplified signal, wherein the pre-distorted signal is generated by: (a) generating one or more waveforms corresponding to one or more pre-distortion parameters; (b) differentiating the one or more waveforms with respect to time to generate one or more differentiated waveforms; (c) applying the one or more differentiated waveforms to the input signal to generate a frequency-dependent pre-distorted signal; (d) generating a frequency-independent pre-distorted signal from the input signal; and (e) combining the frequency-independent pre-distorted signal and the frequency-dependent pre-distorted signal to generate the pre-distorted signal.