| 摘要 |
PROBLEM TO BE SOLVED: To provide a high-frequency amplifier of a wide bandwidth which can be controlled by minimizing influence of a deviation of high and low impedances of a desired frequency bandwidth from an optimum impedance on an frequency bandwidth other than the desired frequency bandwidth. SOLUTION: A high-frequency power amplifier is provided with a high-frequency transistor 1, a basic wave matching circuit 7, and an impedance control circuit 9A supplying direct current to the high-frequency transistor 1 from a power supplying terminal P1 through a bias circuit 8 composed of a high harmonic processing circuit 6, a capacitor 5 for bypass, and a bias line 3 as a distributed constant line, which is composed of a serial circuit of an inductor 10 on the power supplying terminal P1 of the bias circuit 8, a capacitor 11, and resistor 12, for a desired frequency, so that low and high impedances of desired frequency bandwidths may be controlled. COPYRIGHT: (C)2006,JPO&NCIPI
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