Power amplifier including variable capacitor circuit
First Claim
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1. A power amplifier, comprising:
- a first amplification stage configured to amplify a radio frequency (RF) input signal; and
a second amplification stage comprising at least one transistor configured to amplify an output of the first amplification stage and at least one variable capacitor circuit, connected between a gate of the at least one transistor and a first power supply voltage, and configured to have a capacitance that varies in response to amplitude of the output of the first amplification stage to function as a linearizer for the power amplifier.
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Abstract
A power amplifier includes first and second amplification stages. The first amplification stage is configured to amplify a radio frequency (RF) input signal. The second amplification stage includes at least one transistor configured to amplify an output of the first amplification stage, the second amplification stage being configured to have a capacitance between a gate of the at least one transistor and a first power supply voltage. The capacitance automatically varies with amplitude of the output of the first amplification stage.
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Citations
18 Claims
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1. A power amplifier, comprising:
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a first amplification stage configured to amplify a radio frequency (RF) input signal; and a second amplification stage comprising at least one transistor configured to amplify an output of the first amplification stage and at least one variable capacitor circuit, connected between a gate of the at least one transistor and a first power supply voltage, and configured to have a capacitance that varies in response to amplitude of the output of the first amplification stage to function as a linearizer for the power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9)
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10. A power amplifier, comprising:
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a common-source transistor configured to receive an RF signal via a gate of the common-source transistor; a first common-gate transistor connected in cascade to the common-source transistor; and a first variable capacitor circuit connected between a gate of the first common-gate transistor and a ground voltage, a capacitance of the first variable capacitor circuit being controlled to vary, based on a voltage swing of the gate of the first common-gate transistor, to increase linearity of the power amplifier. - View Dependent Claims (11, 12, 13, 14, 15)
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16. A power amplifier having a linearizer, comprising:
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a first amplification stage comprising a common-source transistor configured to receive an RF signal via a gate of the first amplification stage; and a second amplification stage comprising a common-gate transistor, connected in cascade to the first amplification stage, and a variable capacitor circuit, connected between the common-gate transistor and a first power supply voltage, the second amplification stage being configured to amplify an output of the first amplification stage, wherein the variable capacitor circuit is configured to operate as the linearizer, and comprises; a diode circuit including a first capacitor and a diode connected in series to the first capacitor; and a second capacitor connected between a gate of the common-gate transistor and the ground voltage and in parallel to the diode circuit. - View Dependent Claims (17, 18)
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Specification