Power amplifier with variable bias impedance
AssigneeSkyworks Solutions, Inc.
InventorPhilip John Lehtola
Life of this patent
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Abstract
Systems and methods including variable power amplifier bias impedance are disclosed. In one aspect, there is provided a power amplifier system including a bias circuit configured to receive a bias voltage and generate a bias signal and a power amplifier stage configured to receive an input radio frequency (RF) signal and generate an output RF signal. The power amplifier system may also include a bias impedance component operatively coupled between the bias circuit and the power amplifier stage. The bias impedance is component configured to receive a control signal and adjust an impedance value of the bias impedance component in response to the control signal.
Claims20
A power amplifier system comprising:
- a bias circuit configured to receive a bias voltage and generate a bias signal;
- at least one power amplifier stage configured to receive an input radio frequency signal and generate an output radio frequency signal;
- and
- at least first and second bias impedance components operatively coupled between at least one bias circuit and at least one power amplifier stage, the first and second bias impedance components configured to bias the at least one power amplifier stage with a variable impedance based on a control signal that is received separately from the bias circuit, each of the at least first and second bias impedance components configured to receive the same control signal.
A method of adjusting a gain of a power amplifier stage, comprising:
- generating with at least one bias circuit, at least one bias signal;
- receiving, via at least first and second bias impedance components, the bias signal and a control signal, the control signal being received separately from the bias circuit, each of the at least first and second bias impedance components receiving the same control signal;
- adjusting a variable impedance of the first and second bias impedance components based on the control signal;
- and
- biasing at least one power amplifier stage with the variable impedance to vary the generation of an output radio frequency signal.
A mobile device comprising:
- a bias circuit configured to receive a bias voltage and generate a bias signal;
- at least one power amplifier stage configured to receive an input radio frequency signal and generate an output radio frequency signal;
- at least first and second bias impedance components operatively coupled between at least one bias circuit and at least one power amplifier stage, the first and second bias impedance components configured to bias the at least one power amplifier stage with a variable impedance based on a control signal that is received separately from the bias circuit, each of the at least first and second bias impedance components configured to receive the same control signal;
- and
- a modulator configured to generate a radio frequency transmit signal based on the output radio frequency signal.
Dependencies are inferred from the claim text.