| 摘要 |
PROBLEM TO BE SOLVED: To provide a distributed amplifier which has a simple structure and is possible to downsize a circuit. SOLUTION: An input side transmission line 10 of the distributed amplifier is composed of a coplanar line in which a signal line S2 and a ground plane G2 are formed on the upper plane of a dielectric substrate SUB. An output side transmission line 20 is composed of a micro strip line in which a signal line S1 is formed on the upper plane of the dielectric substrate SUB and a ground plane G1 on its lower plane. Furthermore, a plurality of transistors 31 to 36 for amplifiers are formed on the upper plane of the dielectric substrate SUB, and respective electrodes are connected to the signal lines S1, S2, or the ground plane G2 formed on the upper plane. In the input side transmission line 10, since a large current does not flow through the transistors 31 to 36, the signal line S2 can be thin, and a required area does not increase even the coplanar line is used. Furthermore, since the ground plane G2 of the coplanar line can be formed on the upper plane of the dielectric substrate SUB, source electrodes, etc. of the transistors 31 to 36, can be easily grounded in a simple structure. COPYRIGHT: (C)2006,JPO&NCIPI
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