Patent ID: 7689179
Filing Date: 2010-03-30
Classification: H03C,H03F

Abstract:
1. A multistage amplifier apparatus for amplifying an input signal using a control signal, the multistage amplifier apparatus comprising: an amplifier section in which N amplifiers (N is an integer of 2 or more) are serially connected to one another, for performing amplitude modulation on the input signal using an amplitude signal which is the control signal; and M distortion compensation apparatuses (M is a natural number satisfying M<N) which are provided so as to respectively correspond to M amplifiers among the N amplifiers, each for retaining a distortion compensation table in which a voltage of the amplitude signal and a distortion compensated voltage are correlated with each other, and the M distortion compensation apparatuses each providing, based on the distortion compensation table, the distortion compensated voltage which is correlated with the control signal, to a power supply terminal of a corresponding amplifier of the M amplifiers, wherein to power supply terminals of (N−M) amplifiers, to which the distortion compensated voltage is not inputted by the M distortion compensation apparatus, the voltage of the amplitude signal is directly provided.