| 摘要 |
A Doherty power amplifier is provided, and includes: a wideband peak power amplifier having an input end that receives a signal having at least two different narrowband frequency bands, and at least two narrowband carrier power amplifiers connected in parallel with the peak power amplifier, where an input end of each of the narrowband carrier power amplifiers receives a signal having a single narrowband frequency band, and an output end of each of the narrowband carrier power amplifiers is connected in series with a first impedance transformation network. Output impedance of the signals combined by the peak power amplifier and the at least two carrier power amplifiers is converted into load impedance by using a second impedance transformation network, so that the peak power amplifier performs active-load pulling on the carrier power amplifiers. A signal processing method is further provided. The problem that an operating bandwidth of an existing Doherty power amplifier is small can be solved, and meanwhile, the Doherty power amplifier can operate in two or more frequency sub-bands at the same time. |
