| 摘要 |
PROBLEM TO BE SOLVED: To suppress deterioration of a reception characteristic even when the signal strength of an inputted analog signal varies in association with change in a received electric field. SOLUTION: A controller 32 acquires characteristic information showing a gain characteristic indicating a relationship between the signal strength of the analog signal and the gain corresponding to the analog signal at an amplifier 19 from a CPU 18. An AGC controller 30 derives gains corresponding to the signal strength detected at an ADC (Analog Digital Converter) 20 according to the gain characteristic indicated by the acquired characteristic information whenever necessary, and outputs the gain control signal showing the derived gain to the amplifier 19 through a terminal 36B. COPYRIGHT: (C)2009,JPO&INPIT
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