Amplifying device

摘要

An efficient amplifying device is achieved. An amplifying device that amplifies a signal subject to amplification is configured as follows. That is, an amplifier (PA 5) that amplifies a signal is provided. Level control means 1 converts a level of the signal subject to amplification according to the level of this signal. Power supply control means 6 and 8 supply the amplifier (PA 5) with a power supply voltage determined according to the level of the signal subject to amplification. The amplifier (PA 5) amplifies a signal at the level converted by the level control means 1 with the power supply voltage supplied from the power supply control means 6 and 8.

主权项

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:
a gain detection portion that detects a gain of the amplifying device at every level of the signal subject to amplification on the basis of the signal subject to amplification and a signal outputted from the amplifier; andan update processing portion that updates mapping by which to convert the amplitude of the signal subject to amplification in the amplitude control portion and mapping by which to control the power supply voltage in the power supply control portion at every level of the signal subject to amplification so that the gain of the amplifying device becomes closer to a target gain, 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.