Patent ID: 8442460
Filing Date: 2013-05-14
Classification: H03F

Abstract:
1. A method for compensating signal distortions in multiple transmitting branches entering a composite amplifier comprising the steps of: providing one or more input signals to the composite amplifier; observing an output signal from the composite amplifier for each provided input signal; deriving an error in the output signal by comparing the output signal with an ideal output signal, said error being caused by said signal distortions; deriving the individual contribution from each transmitting branch to the error by utilising a composite amplifier model, said composite amplifier model comprising information about the contribution from each constituent amplifier to the output signal for each provided input signal; and compensating the signal distortions in the transmitting branches accordingly, wherein the step of providing one or more input signals to the composite amplifier comprises providing a first input signal and a second input signal to the composite amplifier; the method further comprises: the step of producing the first and second compensation parameters comprises: (i) comparing the output signal with the ideal output signal to produce an error signal and (ii) determining the first and second compensation parameters using the error signal and the composite amplifier model.