Integrated circuit device
First Claim
1. An integrated circuit device comprising:
- a power amplifier comprising a field effect transistor;
a negative voltage generator for supplying a negative voltage to the power amplifier;
an internal switch;
a positive power supply terminal for receiving a positive power supply voltage through an external switch and applying the positive power supply voltage to the negative voltage generator and, through the internal switch, to a power supply terminal of the power amplifier; and
a negative voltage detector for detecting the 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 voltage output from the negative voltage generator is lower than a threshold negative voltage and the internal switch is open when the voltage output from the negative voltage generator is higher than the threshold negative voltage.
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Accused Products
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.
74 Citations
10 Claims
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1. An integrated circuit device comprising:
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a power amplifier comprising a field effect transistor; a negative voltage generator for supplying a negative voltage to the power amplifier; an internal switch; a positive power supply terminal for receiving a positive power supply voltage through an external switch and applying the positive power supply voltage to the negative voltage generator and, through the internal switch, to a power supply terminal of the power amplifier; and a negative voltage detector for detecting the 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 voltage output from the negative voltage generator is lower than a threshold negative voltage and the internal switch is open when the voltage output from the negative voltage generator is higher than the threshold negative voltage. - View Dependent Claims (3, 4, 5, 6, 7, 8, 9, 10)
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2. An integrated circuit device comprising:
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a power amplifier having a power supply terminal; a negative voltage generator for supplying a negative voltage to the power amplifier; a first power supply terminal for receiving a positive power supply voltage through an external switch and supplying the positive power supply voltage to a power supply terminal of the power amplifier; a second power supply terminal for receiving the positive power supply voltage through a second external switch and supplying the positive power supply voltage to the negative voltage generator; and a negative voltage detector for detecting the voltage output from the negative voltage generator and sending a control signal to the first external switch so that the first external switch is closed when the voltage output from the negative voltage generator is lower than a threshold negative voltage and the first external switch is open when the voltage output from the negative voltage generator is higher than the threshold negative voltage.
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Specification