POWER AMPLIFICATION SYSTEM HAVING SHARED BASE SHARED BIAS

摘要

PROBLEM TO BE SOLVED: To provide a power amplification system sharing the bias of a common base stage to a given number of power amplifier stage corresponding to a plurality of frequency bands.SOLUTION: A power amplification system 500 includes a plurality of cascode amplifier sections. The plurality of cascode amplifier sections includes first transistors 552a-552c and second transistors 551a-551c, respectively. The power amplification system 500 includes a base bias component 510 coupled with the bases of the second transistors 551a-551c of the plurality of cascode amplifier sections, respectively, and capable of controlling to apply a bias to the second transistors 551a-551c of the plurality of cascode amplifier sections, respectively.SELECTED DRAWING: Figure 5