US Patent 8422983 Method of controlling power consumption for a radio receiver

In a radio receiver, an analog/digital converting unit, which digitalizes a received signal down-converted in a radio frequency unit and takes the digitalized signal in a baseband unit, is capable of setting a bias current. A method of controlling power consumption includes determining whether a change is a first change in which a state is changed from a receive state to a standby state of the communication signal or a second change in which a state is changed from the standby state to the receive state based on a digital signal output from the analog/digital converting unit; and setting the bias current to a value smaller than a value in case of the second change when the determined change is the first change, and setting the bias current to a value larger than a value in case of the first change when the determined change is the second change.