Matching circuit, dual-band power amplifier

摘要

PROBLEM TO BE SOLVED: To provide a matching circuit capable of performing impedance matching at the same time by each frequency band to the mixed signal of two frequency bands.;SOLUTION: In this matching circuit in which a main-matching block 101 and a sub-matching block 102 are connected in series, the sub-matching b102 when a block is written as b in short includes: a series matching b110 of which the one end is connected in series to the main-matching b101; and a parallel matching network 170 connected to the other end of the series matching b110. When an AC frequency is a first frequency f₁, the connection point of the series matching b110 and a first parallel matching b111 is alternatingly set in an open state, and the connection point of the first parallel matching b111 and a second parallel matching b112 is alternatingly set in a short-circuit state. When the AC frequency is the first frequency f₁, impedance matching is performed by the main-matching b101 and the series matching b110, and when the AC frequency is the second frequency f₂, impedance matching is performed by the main-matching b101 and the sub-matching b102.;COPYRIGHT: (C)2008,JPO&INPIT