Patent ID: 8050722
Filing Date: 2011-11-01
Classification: H03F

Abstract:
1. A voltage supply control device comprising: a voltage conversion circuit which receives a voltage from a battery and generates a desired voltage; and a switching control unit which executes switching so as to: a) supply a voltage to a power amplification circuit to amplify a transmission signal through said voltage conversion circuit when a transmission power of the transmission signal is less than a threshold value of the transmission power, b) supply the voltage to the power amplification circuit through said voltage conversion circuit when the transmission power of the transmission signal is not less than the threshold value of the transmission power and the voltage of the battery is not less than a predetermined threshold value, and c) supply the voltage to the power amplification circuit from the battery without intervention of said voltage conversion circuit when the transmission power of the transmission signal is not less than the threshold value of the transmission power and the voltage of the battery is less than the predetermined threshold value, wherein said switching control unit using, as the predetermined threshold value, selected one of different voltage threshold values for each of a plurality of transmission modes classified in accordance with assumed values of appropriate voltages to be supplied to the power amplification circuit.