HIGH EFFICIENCY LINEAR POWER AMPLIFIER OF PLURAL FREQUENCY BANDS AND HIGH EFFICIENCY POWER AMPLIFIER

摘要

An object of the present invention is to provide a multi-frequency band high efficiency linear power amplifier which can reduce the number of component elements, simplify the circuit configuration, and reduce the circuit space. An input terminal common to the frequency bands A and B in FIG. The signal input from (1) is matched with both frequency bands A and B in the broadband matching circuit 2, amplified by the front end amplifier 3 and input to the common terminal 4a of the switch circuit 4, and the frequency band A Is input to the switching terminal 4b, matched to the matching circuit 5, amplified by the termination amplifier 6, and its output is matched by the termination matching circuit 7 and output from the output terminal 8, The signal in the frequency band B is input to the other switching terminal 4c of the switch circuit 4, matched to the matching circuit 9, amplified by the termination amplifier 10, and its output is output from the termination matching circuit 11. Matched and output from the output terminal 12 . In addition, an object of the present invention is to provide a power amplifier that maintains the same high efficiency characteristics even when the output power is lower than the maximum efficiency output power, parallel to the first and second power amplifiers 113 and 114 in FIG. Connected to the required number of power amplifiers according to the output power required by the switch circuits 15 to 18, and only the connected power amplifiers are turned on, and the remaining power amplifiers are turned off to reduce the output power. As the current consumption is proportionally smaller, the same high efficiency operation as at maximum efficiency can be realized.