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US 11,239,808 B2Granted
Feedback amplifier as an impedance modulator for a linear power amplifier
AssigneeAvago Technologies International Sales Pte. Limited
InventorsSeung Yub Lee, Jun Hee Oh, Un-Ha Kim, Joo Young Jeon
Life of this patent
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Abstract
A power amplifier and power amplification circuit are described herein. An illustrative power amplifier is disclosed to include an input terminal, a drive amplifier connected to the input terminal, and an impedance modulator having a capacitance that is adjusted inversely and proportionately relative to a signal output by the drive amplifier, wherein the impedance modulator provides a feedback loop between an output of the drive amplifier and the input terminal.
Claims20
A power amplifier, comprising:
- an input terminal;
- a drive amplifier connected to the input terminal;
- an impedance modulator having a capacitance that is adjusted inversely and proportionately relative to a signal output by the drive amplifier, wherein the impedance modulator provides a feedback loop between an output of the drive amplifier and the input terminal;
- and
- a controller that provides a bias voltage to the impedance modulator.
2 more elements
A power amplification circuit, comprising:
- an input terminal;
- an output terminal;
- a drive amplifier having an input connected to the input terminal;
- a main stage amplifier having an input connected to an output of the drive amplifier and having an output connected to the output terminal;
- an impedance modulator having a capacitance that is adjusted inversely and proportionately relative to a signal output by the drive amplifier, wherein the impedance modulator is connected between the drive amplifier and the main stage amplifier and further provides a feedback loop between the output of the drive amplifier and the input terminal;
- and
- a controller that provides a bias voltage to the impedance modulator.
4 more elements
A circuit, comprising:
- a detecting amplifier that receives a signal output by a drive amplifier and that amplifies the signal output by the drive amplifier;
- an inverting amplifier that receives an output of the detecting amplifier and that modulates the output of the detecting amplifier;
- and
- a capacitor having a capacitance that is adjusted inversely relative to the signal output by the drive amplifier, wherein the capacitor is shunt connected to an input of the drive amplifier.
1 more element
Dependencies are inferred from the claim text.