Patent ID: 6288606
Filing Date: 2001-09-11
Classification: H03F,H03G

Abstract:
A linear power amplifier arrangement for providing a selectable amount of amplification to a radio frequency signal to be amplified, comprising:a first parallel amplifier branch and a second parallel amplifier branch,means for conducting the radio frequency signal to be amplified selectably to one of the parallel amplifier branches, andin the first parallel amplifier branch a series connection of a predistorter and a nonlinear amplifier,wherein said predistorter is arranged to compensate for the nonlinearity of said nonlinear amplifier;a first adjustable phase shifter in the first parallel amplifier branch;a second adjustable phase shifter in the second parallel amplifier branch; anda phase detector arranged to compare the phases of signals in the first and second parallel amplifier branches and to adjust at least one of said first and second adjustable phase shifters as a response to said comparison of phases.