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US 12,671,374 B2Granted
Envelope tracking with dynamically configurable error amplifier
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 plurality of amplifying stages, one or more of the plurality of amplifying stages configured to be selectively activated to adjust a slew rate of the error amplifier;
- a bandwidth detection circuit configured to generate a bandwidth signal indicating a bandwidth of the envelope signal;
- and
- a control circuit configured to selectively activate the one or more of the plurality of amplifying stages of the error amplifier based on the bandwidth signal to adaptively adjust the slew rate to increase the slew rate of the error amplifier for larger envelope bandwidths and decrease the slew rate of the error amplifier for smaller envelope bandwidths by using one or more slew rate switches.
2 more elements
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 configured to receive an envelope signal corresponding to an envelope of the radio frequency signal, the envelope tracker including a bandwidth detection circuit configured to generate a bandwidth signal indicating a bandwidth of the envelope signal, and an error amplifier configured to generate the power amplifier supply voltage, the error amplifier including a plurality of amplifying stages, one or more of the plurality of amplifying stages configured to be selectively activated 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 amplifying stages of the error amplifier based on the bandwidth signal to adaptively adjust the slew rate to increase the slew rate of the error amplifier for larger envelope bandwidths and decrease the slew rate of the error amplifier for smaller envelope bandwidths by using one or more slew rate switches.
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, the power amplifier system further including an envelope tracker including a bandwidth detection circuit configured to generate a bandwidth signal indicating a bandwidth of an envelope signal, and an error amplifier configured to generate the power amplifier supply voltage, the error amplifier including a plurality of amplifying stages, one or more of the plurality of amplifying stages configured to be selectively activated to adjust a slew rate of the error amplifier, the envelope tracker further including a control circuit configured to control the error amplifier to selectively activate the one or more of the plurality of amplifying stages based on the bandwidth signal to adaptively adjust the slew rate to increase the slew rate of the error amplifier for larger envelope bandwidths and decrease the slew rate of the error amplifier for smaller envelope bandwidths by using one or more slew rate switches;
- and
- an antenna configured to transmit the amplified radio frequency signal.
Dependencies are inferred from the claim text.