AMPLIFIER CIRCUIT

摘要

An amplifier circuit easily suppresses an intermodulation distortion signal incident to amplification. An input signal is class A amplified to be ¿ times stronger on a path of a first amplifier 102, resulting in an input signal component F1 and F2 of power ¿F, and intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk1. The input signal is class AB amplified to be À times ( ¿> À) stronger on a path of a second amplifier 103, resulting in an input signal component F1 and F2 of power ÀF, and intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk2. A combiner 104 combines the input signal component F1 and F2 of power ¿F and the intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk1 with the input signal component F1 and F2 of power ÀF and the intermodulation distortion signal components (2F1-F2) and (2F2-F1) of power Fk2.