Patent ID: 6046635
Filing Date: 2000-04-04
Classification: H03F

Abstract:
An amplifier arrangement for amplifying an input signal with which a distortion cancelling input is combined, said amplifier arrangement comprising:a main amplifier,an error loop includinga comparator which differences a delayed derivative of said input signal to said amplifier arrangement with a signal representative of the output of said main amplifier to provide an error signal;a first distortion controlled feedback loop includinga detector for receiving said error signal and generating a detected error signal output; anda distortion signal generation circuit for generating a predistortion signal havingan auxiliary amplifier for receiving a signal derived from said input signal and generating an auxiliary signal output,signal correction circuitry for receiving the auxiliary signal output for adjusting said auxiliary output signal gain and phase, and,a first combiner for combining a delayed version of said input signal with an output of said signal correction circuitry for generating a distortion components signal,a second combiner for combining said distortion components signal with a delayed replica of said input signal for input to said main amplifier, andsaid controlled feedback loop further comprising a compensation circuit connected to the detected error control signal output of the detector for generating predistortion control signals to the correction circuitry, said detector extracting information from said error signal and said control signals minimizing said detected error signal output.