Patent ID: 6784731
Filing Date: 2004-08-31
Classification: H03F

Abstract:
A method of producing an amplified signal, said method comprising the steps of:sampling an input signal to be amplified on a signal path onto a carrier cancellation path; amplifying said input signal on said signal path by an amplifier on said signal path to produce said amplified signal with distortion; sampling said amplified signal with distortion to produce a sample amplified signal with distortion on a feedback path; combining said sample input signal on said carrier cancellation path with said sample amplified signal with distortion on said feedback path to obtain a distortion signal on said feedback path; sampling said distortion signal to produce a sample distortion signal; frequency down-converting said sample distortion signal; filtering said sample distortion signal to produce a residual non-distortion signal; responding to said residual non-distortion signal by generating at least one control signal from said residual non-distortion signal using a voltage differential amplifier and integrator; and placing said distortion signal from said feedback path onto said signal path prior to said amplifier to reduce distortion produced from said amplifier.