Patent ID: 9479128
Filing Date: 2016-10-25
CPC Classification: H03F,H04B

Claim Text:
1. A multi-mode power amplifier configured to operate in one of a low power mode, a medium power mode and a high power mode, the multi-mode power amplifier comprising: a power-tunable first power amplifier unit configured to operate in either a first power mode outputting a first output power or a second power mode outputting a second output power higher than the first output power; a demultiplexer disposed in a signal path of the multi-mode power amplifier and having an input terminal, a first output terminal, a second output terminal and a third output terminal, the input terminal coupled to an output terminal of the first power amplifier unit, the demultiplexer configured to selectively couple the input terminal to one of the first output terminal, the second output terminal and the third output terminal; a low power output matching circuit having an input terminal and an output terminal, the input terminal coupled to the first output terminal of the demultiplexer; a medium power output matching circuit having an input terminal and an output terminal, the input terminal coupled to the second output terminal of the demultiplexer; a second power amplifier unit having an input terminal and an output terminal, the input terminal coupled to the third output terminal of the demultiplexer; a high power output matching circuit having an input terminal and an output terminal, the input terminal coupled to the output terminal of the second power amplifier unit, the output terminal coupled to the output terminal of the low power output matching circuit and the output terminal of the medium power output matching circuit; and a regulation control circuit configured to perform one of a plurality of operations comprising: