| 摘要 |
PROBLEM TO BE SOLVED: To make an AGC drawing velocity compatible with AGC drawing precision at AGC control. SOLUTION: A radio part 102 amplifies a reception signal, performs a prescribed radio reception processing and obtains a baseband signal. An MAC part 104 control timing, based on the demodulated baseband signal and outputs a reception signal. A selection part 111 changes-over a correction coefficient, based on the control signal from the MAC part 104. In this case, the correction coefficient is set to a large value at first and changed into a small value, as the updating times in AGC increases. A subtracting part 107 obtains the difference between integration result obtained, by integrating the level of the base band signal for a prescribed time and a reference value. A multiplying part 108 multiplies the difference obtained by the subtracting part 107 using the correction coefficient. An addition part 110 adds the output of the multiplying part 108 to an AGC control signal, which is delayed by a unit control period by a delay part 109, generates the AGC control signal to be used in the present control period and controls the amplification gain of the ratio part 102. |
