Circuit and a method for generating a radio frequency signal
AssigneeApple Inc.
InventorsAndreas Langer, Christoph Hepp
Life of this patent
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Abstract
A circuit for generating a radio frequency signal is provided. The circuit includes an amplifier configured to generate a radio frequency signal based on a baseband signal. Further, the circuit includes a power supply configured to generate a variable supply voltage based on a control signal indicating a desired supply voltage, and to supply the variable supply voltage to the amplifier. The circuit further includes an envelope tracking circuit configured to generate the control signal based on a bandwidth of the baseband signal, and to supply the control signal to the power supply.
Claims25
A circuit for generating a radio frequency signal, comprising:
- an amplifier configured to generate the radio frequency signal based on a baseband signal;
- a power supply configured to generate a variable supply voltage based on a control signal indicating a desired supply voltage, and to supply the variable supply voltage to the amplifier;
- and
- an envelope tracking circuit configured to generate the control signal based on a bandwidth of the baseband signal, and to supply the control signal to the power supply.
A control circuit for controlling a power supply supplying a variable supply voltage to an amplifier, the amplifier generating a radio frequency signal based on a baseband signal, wherein the control circuit is configured to mitigate a gain variation of the power supply by generating a control signal based on a bandwidth of the baseband signal and supplying the control signal to the power supply.
A method for generating a radio frequency signal depending on a baseband signal using an amplifier, comprising:
- generating a control signal for a power supply based on a bandwidth of the baseband signal;
- supplying the control signal to the power supply;
- generating a variable supply voltage based on the control signal using the power supply;
- and
- supplying the variable supply voltage to the amplifier,
- wherein the control signal indicates a desired supply voltage.
A method for controlling a power supply supplying a variable supply voltage to an amplifier, the amplifier generating a radio frequency signal based on a baseband signal, wherein the method comprises mitigating a gain variation of the power supply by generating a control signal based on a bandwidth of the baseband signal and supplying the control signal to the power supply.
Dependencies are inferred from the claim text.