IMPEDANCE CONVERSION CIRCUIT AND POWER AMPLIFIER EMPLOYING THE SAME

摘要

PROBLEM TO BE SOLVED: To perform impedance conversion under impedance conditions for a plurality of frequency bands at a low loss. SOLUTION: An impedance conversion circuit 10A includes: a phase adjustment purpose transmission line 4 for adjusting a phase of a received high frequency signal; a first switch element 6A connected to an output side of the transmission line 4; a first output terminal 7A provided to an output side of the first switch element 6A and outputting the high frequency signal as a first high frequency signal; a first reflection amount adjustment purpose transmission line 5 connected to the output of the phase adjustment purpose transmission line 4 and capable of reflecting the high frequency signal; a second switch element 6B connected to an output of the transmission line 5; and a second output terminal 7B provided to an output side of the second switch element 6B and outputting the high frequency signal as a second high frequency signal. Either of the first and second switch elements 6A, 6B is brought into an on-state. COPYRIGHT: (C)2008,JPO&INPIT