| 摘要 |
A radio frequency amplification unit is provided. The radio frequency amplification unit comprises a main amplifier, wherein the main amplifier is operable to amplify a first portion of an input signal, an auxiliary amplifier, wherein the auxiliary amplifier is operable to turn on and to amplify a second portion of the input signal when the amplitude of the second portion of the input signal fourth signal exceeds a threshold amplitude, and a broadband impedance transformer that is coupled between an output of the main amplifier and an output of the auxiliary amplifier. The broadband impedance transformer produces an transformed output of the main amplifier based on an output of the main amplifier. The broadband impedance transformer comprises a quarter wavelength matching line coupled to a directional coupler, wherein the directional coupler has the same electrical length as the quarter wavelength matching line. |
