Final three-route power synthesizing amplifying circuit applied to power amplifier of mobile communication base station system

Abstract

The invention relates to a final three-route power synthesizing amplifying circuit applied to a power amplifier of a mobile communication base station system. The invention is characterized in that the circuit comprises a first coupler, a first absorption load, a first microstrip line, a Doherty synthesizing amplifier, a fourth microstrip line, a third final amplifier, a seventh microstrip line, a third coupler and a third absorption load. A 0 degree output end of the first coupler is connected to an input end of the Doherty synthesizing amplifier by the first microstrip line; a -90 degree output end of the first coupler is connected to an input end of the third final amplifier by the fourth microstrip line; an output end of the third final amplifier is connected to a 0 degree input end of the third coupler by the seventh microstrip line; an output end of the Doherty synthesizing amplifier is connected to a 90 degrees input end of the third coupler; an output end of the third coupler outputs amplified radio-frequency signals. The circuit satisfies requirement of high efficiency, has low cost, and also guarantees reliable and stable work of power amplifier.

Description

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AI Technical Summary

Problems solved by technology

However, the output power of a specific power tube is basically fixed, which causes the phenomenon that an odd number of power amplifier tubes need to be used for power synthesis in some designs.

Although the Dohert

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