Patent ID: 8884697
Filing Date: 2014-11-11
Classification: H03F

Abstract:
1. An amplifying device that amplifies a signal subject to amplification, the amplifying device comprising: an amplifier that amplifies a signal; a power supply portion of the amplifier; a level detection portion that detects a level of the signal subject to amplification; an amplitude control portion that converts an amplitude of the signal subject to amplification to an amplitude mapped to the level of the signal detected in the level detection portion; and a power supply control portion that controls a power supply voltage of the power supply portion to be a power supply voltage mapped to the level of the signal detected in the level detection portion, wherein the amplifier amplifies the signal having the amplitude converted by the amplitude control portion, the amplifying device further comprises: the update control portion compares the gain at every level of the signal subject to amplification detected by the gain detection portion with the target gain, in a case where the detected gain is higher than the target gain, processing to update the mapping by which to control the power supply voltage in the power supply control portion in a direction to lower the power supply voltage is performed with a higher priority than processing to update the mapping by which to convert the amplitude of the signal subject to amplification in the amplitude control portion, and in a case where the detected gain is lower than the target gain, processing to update the mapping by which to convert the amplitude of the signal subject to amplification in the amplitude control portion in a direction to increase the amplitude of the signal subject to amplification is performed with a higher priority than processing to update the mapping by which to control the power supply voltage in the power supply control portion.