Integrated circuit device

Abstract

An integrated circuit device includes a power amplifier having an FET; a negative voltage generator for supplying a negative voltage to the power amplifier; a power supply terminal receiving a positive power supply voltage through an external switch and applying the positive power supply voltage to the negative voltage generator and, through an internal switch, to the power amplifier; and a negative voltage detector for detecting the negative voltage output from the negative voltage generator and sending a control signal to the internal switch so that the internal switch is closed when the output voltage from the negative voltage generator is lower than a threshold negative voltage and open when the output voltage is higher than the threshold negative voltage. It is not necessary to supply an external negative voltage as a gate bias voltage of the FET. Since the positive power voltage is applied to both the power amplifier and the negative voltage generator, an external power supply control circuit outputs only one control signal to control the external switch. It is not necessary to set a time interval from application of the power supply voltage to the negative voltage generator until application of the power supply voltage to the power amplifier in advance so that power dissipation is significantly reduced.

Dependencies are inferred from the claim text.