Patent ID: 6369649
Filing Date: 2002-04-09
Classification: H03F,H03G

Abstract:
A transmission power amplification apparatus comprising:first variable gain amplification means for amplifying an input signal; second variable gain amplification means for amplifying an output from said first variable gain amplification means; nonlinear gain amplification means for nonlinearly amplifying an output from said second variable gain amplification means and outputting a transmission signal; and control means for controlling amplification of the input signal by using the synthetic gain of said first and second variable gain amplification means and said nonlinear gain amplification means in a transmission power range from a maximum value to an intermediate value, and controlling amplification of the input signal by using only the gain of said first variable gain amplification means in a transmission power range from the intermediate value to a minimum value, wherein said second variable gain amplification means has a gain characteristic that corrects nonlinearity of said nonlinear gain amplification means.