Patent ID: 8665017
Filing Date: 2014-03-04
Classification: H03F

Abstract:
1. An amplifier circuit comprising: an amplifier that amplifies power of an input signal; a power modulating unit that provides a power supply voltage to the amplifier, the power supply voltage being modulated based on the input signal; a timing adjusting unit that has a finite number of adjustment values for adjusting time by which output is delayed from input, and that is capable of adjusting a time difference between the input signal and the power supply voltage each reaching the amplifier by making a selection from the adjustment values; a test signal output unit capable of repeatedly sending out a predetermined test signal, as the input signal, at predetermined cycles; and an adjustment value determining unit that sequentially measures output power for m period(s) from the amplifier while changing an adjustment value of the timing adjusting unit to a different value at every k periods of the test signal when k is any natural number and m is any natural number satisfying m≦k, the adjustment value determining unit searching for an adjustment value at which a total sum or average of the output power for m period(s) is maximum to thereby set the adjustment value on the timing adjusting unit.