Adaptive envelope tracking based on detected transmit signal bandwidth
AssigneeSkyworks Solutions, Inc.
InventorsSabah Khesbak, Roman Zbigniew Arkiszewski, Jeffrey Gordon Strahler, Florinel G. Balteanu
Life of this patent
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Abstract
Apparatus and methods for power amplifier envelope tracking systems with automatic control of a slew rate and a mode of an error amplifier of the envelope tracking system. The envelope tracker can include a signal bandwidth detection circuit that processes the envelope signal to generate a detected bandwidth signal, and a control circuit that controls the slew rate of the error amplifier based on the detected signal bandwidth.
Claims20
An envelope tracker for a power amplifier, the envelope tracker comprising:
- an input configured to receive an envelope signal corresponding to an envelope of a radio frequency signal;
- an error amplifier configured to generate a power amplifier supply voltage, the error amplifier including a biasing stage configured to adjust a slew rate of the error amplifier;
- and
- a control circuit configured to adjust the biasing stage based on a bandwidth of the envelope signal.
A radio frequency front end module comprising:
- a power amplifier configured to amplify a radio frequency signal and to receive power from a power amplifier supply voltage;
- an envelope tracker including an error amplifier configured to generate the power amplifier supply voltage, the error amplifier including a plurality of biasing stages, one or more of the plurality of biasing stages configured to be selectively controlled to adjust a slew rate of the error amplifier, the envelope tracker further including a control circuit configured to selectively activate the one or more of the plurality of biasing stages.
A mobile device comprising:
- a power amplifier system including a power amplifier configured to amplify a radio frequency signal and to receive power from a power amplifier supply voltage, an error amplifier configured to generate the power amplifier supply voltage, and a control circuit, the error amplifier including a plurality of biasing stages configured to bias an amplifying stage, one or more of the plurality of biasing stages configured to adjust a slew rate of the error amplifier, the control circuit configured to control the error amplifier to selectively activate the one or more biasing stages;
- and
- an antenna configured to transmit the amplified radio frequency signal.
Dependencies are inferred from the claim text.