| 摘要 |
PROBLEM TO BE SOLVED: To provide a power amplification system capable of avoiding reduction of the efficiency under low power conditions.SOLUTION: A power amplification system 500 having an adjustable base common bias includes a first transistor 511 having a base coupled to a radio-frequency input RFin, and a second transistor 512 having an emitter coupled to a collector of the first transistor 511 and having a collector coupled to a radio-frequency output RFout. The power amplification system 500 includes a biasing component 520 configured to apply a fixed biasing signal to the base of the first transistor 511 and to apply an adjustable biasing signal to the base of the second transistor 512.SELECTED DRAWING: Figure 5 |
