| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-frequency switching circuit for easily performing optimization with the output impedance of an element which is connected to the pre-stage of a high-frequency switch SW and suppressing a higher harmonic to be generated from the high-frequency switch SW. SOLUTION: The transmission wave input side terminal Pb of the high-frequency switch SW is directly connected to a first terminal P1 and branched into a second terminal P2, a third terminal P3, and a fourth terminal P4, respectively via phase shifters PS2, PS3, PS4. The inductance and capacitance of the respective phase shifters PS2-PS4 are appropriately selected so as to divide 360°into equal intervals, concerning the amount of phase shifting in the respective terminals P1-P4. Consequently, the input side terminal which is superior for the condition of a connection point with a low-pass filter LPF, etc., to be connected to the transmission wave input side of the high-frequency switch SW. COPYRIGHT: (C)2006,JPO&NCIPI
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