Patent ID: 7978008

Claim:
A supply voltage control device for an amplifier that controls a supply voltage for the amplifier, comprising: a supply voltage control circuit including an error amplification circuit that feeds an error current so as to control the supply voltage for the amplifier, and a direct current feed circuit that feeds a direct current or the direct current and a current of a low-frequency component so as to control the supply voltage for the amplifier; a high-frequency component extraction unit that extracts a predetermined high-frequency component contained in a signal resulting from detection of an envelope relevant to a signal to be amplified by the amplifier; a peak hold unit that performs peak hold processing on a signal of the high-frequency component extracted by the high-frequency component extraction unit; and an addition unit that adds up a signal based on the result of the detection of the envelope relevant to the signal to be amplified by the amplifier, and a signal resulting from the peak hold processing performed by the peak hold unit, and inputs a signal resulting from the addition to the supply voltage control circuit.