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.
Claims20
A mobile communication device comprising:
- an antenna element configured to transmit and receive radio frequency signals;
- and
- a transmitter coupled to the antenna element, the transmitter having
- an amplifier configured to provide an amplified radio frequency signal based on a baseband signal to the antenna element for transmission, and operating according to a supply voltage,
- a power supply configured to generate the supply voltage based on a control signal, and
- a control circuit configured to generate the control signal based on a bandwidth of the baseband signal in a manner that compensates for a bandwidth dependent output of the power supply.
A method for radio frequency signal generation, the method comprising:
- amplifying, according to at least a variable amplifier-supply-voltage, a radio frequency signal generated based on a baseband signal;
- and
- generating the variable amplifier-supply-voltage according to a control signal, wherein the control signal is based on a bandwidth of the baseband signal in a manner that compensates for a bandwidth dependency of the variable amplifier-supply-voltage.
A transmitter circuit comprising:
- a radio frequency signal generator configured to generate an intermediate radio frequency signal based on a baseband signal;
- an amplifier configured to operate according to at least a supply voltage and amplify a radio frequency signal based on the intermediate radio frequency signal;
- a power supply configured to generate the supply voltage according to at least a control signal;
- and
- a control circuit configured to generate the control signal based on a bandwidth of the baseband signal in a manner that compensates for a bandwidth dependency of the supply voltage.
Dependencies are inferred from the claim text.