초록 ▼

A power supply apparatus for a mobile communication terminal having voltage regulators, a receiver and baseband signal processor, a transmitter, a power amplifier, and a DC/DC converter for converting a DC voltage from a battery. In a reception mode of the mobile communication terminal, the power su

A power supply apparatus for a mobile communication terminal having voltage regulators, a receiver and baseband signal processor, a transmitter, a power amplifier, and a DC/DC converter for converting a DC voltage from a battery. In a reception mode of the mobile communication terminal, the power supply apparatus regulates the DC voltage converted by the DC/DC converter and supplies the regulated DC voltage to the receiver and baseband signal processor. In a transmission mode, the power supply apparatus converts the DC voltage to a DC voltage corresponding to a transmission AGC (Automatic Gain Control) voltage which is determined based on a transmission power. The converted DC voltage is then supplied to the receiver and baseband signal processor, the transmitter, and the power amplifier via the voltage regulators. The power supply apparatus has a single DC/DC converter and adaptively varies the output voltage of the DC/DC converter according to the transmission power in the transmission mode. A method is also provided for controlling a power supply voltage in a communication terminal capable of operating in a reception mode and in a transmission mode. The method comprises the steps of regulating a DC voltage converted by a DC/DC converter and supplying the regulated DC voltage to the receiver and baseband signal processor in the reception mode; and converting the DC voltage converted by the DC/DC converter to a DC voltage corresponding to a transmission AGC voltage determined according to a transmission power and supplying the converted DC voltage to the receiver and baseband signal processor, the transmitter, and the power amplifier in the transmission mode.

대표청구항 ▼

1. A power supply apparatus for a mobile communication terminal capable of operating in a reception mode and in a transmission mode, the power supply apparatus comprising:a DC/DC converter having at least one input lead and at least two output leads for converting a DC voltage supplied from a batter

1. A power supply apparatus for a mobile communication terminal capable of operating in a reception mode and in a transmission mode, the power supply apparatus comprising:a DC/DC converter having at least one input lead and at least two output leads for converting a DC voltage supplied from a battery at the at least one input lead to a constant DC voltage and outputting the constant DC voltage to a first of the at least two output leads; voltage control current means connected to the first of the at least two output leads for varying current flow according to a transmission AGC voltage in the transmission mode to adaptively vary an output voltage at a second of the at least two output leads of the DC/DC converter based on a transmission power; and a switch connected between the second of the at least two output leads of the DC/DC converter and a transmitter and a power amplifier, said switch being in a closed position during the transmission mode to transfer the output voltage of the DC/DC converter to the transmitter and the power amplifier.