| 摘要 |
PROBLEM TO BE SOLVED: To provide an inexpensive power survo loop that incorporates a detection control means, and is especially used for controlling power amplifiers. SOLUTION: A detection circuit (100) of the servo loop includes a coupling means (1) for gathering a radio frequency signal, and a detection unit (3) for sending a detection signal (Vdet) that indicates a first radio frequency signal gathered by the coupling means as one portion. The detection circuit includes detection control means (21, 22, and 4) for practically eliminating a second ratio frequency signal gathered by the coupling means, the so-called interference signal, between the coupling means and the detection unit. As a result, the detection signal indicates the first radio frequency signal as a whole. COPYRIGHT: (C)2003,JPO
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