| 摘要 |
PROBLEM TO BE SOLVED: To provide a transmission apparatus and transmission power detection device thereof in which powers of two transmission signals can be detected and controlled while suppressing increase in the number of circuit elements or expansion in the area. SOLUTION: A signal flowing backward from a first output terminal T1 to a first power amplifier circuit A1 is suppressed by an isolator 10 provided in a signal path for supplying a transmission signal from the first power amplifier circuit A1 to the first output terminal T1. Furthermore, a part of an output signal from a second power amplifier circuit A2 is inputted to an input terminal T3 of a rectifier circuit 13 by a directional coupler circuit 11 provided in a signal path for supplying a transmission signal from the second power amplifier circuit A2 to a second output terminal T2. Moreover, a part of an output signal from the first power amplifier circuit A1 is inputted to the rectifier circuit 13 by capacitors C1, C2 for electrically coarsely coupling an input terminal of the isolator 10 and the input terminal T3 of the rectifier circuit 13. COPYRIGHT: (C)2007,JPO&INPIT
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