Patent ID: 7675360
Filing Date: 2010-03-09
Classification: H03G

Abstract:
1. A power control circuit configured to perform power control of an input signal in accordance with a required gain set value, comprising: a fine adjustment variable amplifying unit configured to amplify the input signal in accordance with a first gain set value; a coarse adjustment variable amplifying unit configured to amplify the input signal in accordance with a second gain set value, wherein a gain control range of the coarse adjustment variable amplifying unit is larger than a gain control range of the fine adjustment variable amplifying unit; a branching unit configured to branch an output signal, which is obtained by amplifying the input signal with the fine adjustment variable amplifying unit and the coarse adjustment variable amplifying unit, into a feedback signal; a comparing unit configured to compare a gain value between the input signal and the output signal with the required gain set value based on the feedback signal; a control unit configured to determine the first gain set value and the second gain set value based on the required gain set value; and an adjusting unit configured to adjust the first gain set value and the second gain set value determined by the control unit so that a power value of the feedback signal becomes a power value corresponding to the required gain set value in accordance with a result of the comparison by the comparing unit.