Pulsed dynamic load modulation power amplifier circuit
AssigneeAvago Technologies General IP (Singapore) Pte. Ltd.
InventorsMoon-Suk Jeon, Jung-Rin Woo, Sung-Hwan Park, Jung Hyun Kim, Young Kwon
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Abstract
A power amplifier circuit for amplifying an envelope modulated Radio Frequency (RF) signal with improved linearity and efficiency includes a power amplifier, and a variable load matching circuit coupled to an output port of the power amplifier. The input impedance of the variable load matching circuit is changed such that an output power of the power amplifier is at a first output power level, or a second output power level which is higher than the first output power level.
Claims20
A power amplifier circuit, comprising:
- a power amplifier configured to amplify an envelope modulated radio frequency (RF) signal;
- and
- a variable load matching circuit coupled to an output port of the power amplifier, the variable load matching circuit configured to have an input impedance that is changeable so that an output power of the power amplifier changes between a first output power level and a second output power level which is higher than the first output power level.
A method of amplifying an envelope modulated Radio Frequency (RF) signal using a power amplifier, comprising:
- changing an impedance coupled to an output port of the power amplifier, so that an output power of the power amplifier changes between a first output power level and a second output power level which is higher than the first output power level.
A power amplifier circuit, comprising:
- an attenuator configured to adjustably attenuate an envelope modulated radio frequency (RF) signal;
- a power amplifier configured to amplify an output of the attenuator;
- a variable load matching circuit connected to an output of the power amplifier, the variable load matching circuit configured to have a variable input impedance that is switchable between a first impedance state and a second impedance state so that an output power level of the power amplifier switches between a first power level and a second power level that is greater than the first power level;
- and
- a filter configured to recover the envelope modulated RF signal responsive to an output of the variable load matching circuit.
Dependencies are inferred from the claim text.