| 摘要 |
PROBLEM TO BE SOLVED: To provide a semiconductor amplification device capable of reducing influences of an output bias circuit connected with the exterior, and suppressing a double wave.SOLUTION: A semiconductor amplification device has a semiconductor amplification element, an output terminal, a bonding wire, a transmission line group, and a short stub circuit. The semiconductor amplification element has an input electrode and an output electrode. The transmission line group includes a plurality of transmission lines. The plurality of transmission lines at least has a first transmission line having a first electric length equal to or less than 90° at an upper limit frequency in a band, and a second transmission line having a second electric length equal to or less than 90° at the central frequency in the band. A characteristic impedance of the second transmission line is higher than that of the first transmission line. The short stub has a capacitor, and a third transmission line having a third electric length of about 90° at the central frequency. One end part of the third transmission line is connected with the second transmission line at a position where the electric length at the central frequency becomes about 45°, toward the output terminal side.SELECTED DRAWING: Figure 1 |
