| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive and small feed forward amplifier with low power consumption and high capacity. SOLUTION: Most parts of circuits in the feed forward amplifier are stored in a unit 66. In the unit 66, one or a plurality of cases cover a surface face of a single circuit board and a base plate is arranged on a backside so that they are closely stuck. The case is divided into a plurality of electromagnetic shielding chambers by rib-like partitions. Conductors on a surface or an inner layer of the circuit board, surface mounted parts or drop-in-type parts are used as the parts and wiring, which constitute the circuit. Dielectrics or the parts suitable for substrate mounting such as a hollow resonation type and a surface mounting-type are used as delay elements 26A and 20A. Only a part depending on customer specification in a monitoring control function is detached as a customer specification monitoring control circuit 64 outside the unit 66, and it speedily and inexpensively corresponds to customer specification or the change. COPYRIGHT: (C)2004,JPO
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