Power amplifier circuit
First Claim
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1. A power amplifier circuit comprising:
- a first transistor, a radio frequency signal being input into a base of the first transistor;
a first voltage output circuit configured to output a first voltage in accordance with a power supply voltage; and
a second transistor, wherein;
the first voltage is supplied to a base or a gate of the second transistor,an emitter or a source of the second transistor is connected to a collector of the first transistor,a first amplified signal generated by amplifying the radio frequency signal is output from a collector or a drain of the second transistor, andthe first voltage output circuit comprises;
a limiter circuit that controls the first voltage at or above a predetermined level so as to turn ON the second transistor,a first resistor, anda second resistor,wherein the first resistor and the second resistor are connected in series with each other, and the first voltage is output from a node between the first resistor and the second resistor, andwherein the limiter circuit comprises a diode connected to ground in series with the first resistor and the second resistor, and a third transistor configured to cause a current to flow through the first resistor and the second resistor based on a control signal that turns ON the third transistor.
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Abstract
A power amplifier circuit includes first and second transistors and a first voltage output circuit. A radio frequency signal is input into a base of the first transistor. The first voltage output circuit outputs a first voltage in accordance with a power supply voltage. The first voltage is supplied to a base or a gate of the second transistor. An emitter or a source of the second transistor is connected to a collector of the first transistor. A first amplified signal generated by amplifying the radio frequency signal is output from a collector or a drain of the second transistor.
6 Citations
16 Claims
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1. A power amplifier circuit comprising:
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a first transistor, a radio frequency signal being input into a base of the first transistor; a first voltage output circuit configured to output a first voltage in accordance with a power supply voltage; and a second transistor, wherein; the first voltage is supplied to a base or a gate of the second transistor, an emitter or a source of the second transistor is connected to a collector of the first transistor, a first amplified signal generated by amplifying the radio frequency signal is output from a collector or a drain of the second transistor, and the first voltage output circuit comprises; a limiter circuit that controls the first voltage at or above a predetermined level so as to turn ON the second transistor, a first resistor, and a second resistor, wherein the first resistor and the second resistor are connected in series with each other, and the first voltage is output from a node between the first resistor and the second resistor, and wherein the limiter circuit comprises a diode connected to ground in series with the first resistor and the second resistor, and a third transistor configured to cause a current to flow through the first resistor and the second resistor based on a control signal that turns ON the third transistor. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16)
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Specification