Envelope tracking with adjustable slew rate
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;
- a signal bandwidth detection circuit configured to generate a detected bandwidth signal indicating a bandwidth of the envelope signal;
- and
- a shaping and control circuit configured to control a slew rate of the error amplifier based on the detected bandwidth signal.
A power amplifier system comprising:
- a power amplifier configured to amplify a radio frequency signal and to receive power from a power amplifier supply voltage;
- and
- an envelope tracker configured to generate the power amplifier supply voltage based on an envelope signal corresponding to an envelope of the radio frequency signal, the envelope tracker including an error amplifier, a signal bandwidth detection circuit configured to generate a detected bandwidth signal indicating a bandwidth of the envelope signal, and a shaping and control circuit, the shaping and control circuit configured to control a slew rate of the error amplifier based on the detected bandwidth signal.
A mobile device 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 generate the power amplifier supply voltage based on an envelope signal corresponding to an envelope of the radio frequency signal, the envelope tracker including an error amplifier, a signal bandwidth detection circuit configured to generate a detected bandwidth signal indicating a bandwidth of the envelope signal, and a shaping and control circuit, the shaping and control circuit configured to control a slew rate of the error amplifier based on the detected bandwidth signal;
- and
- an antenna configured to transmit the radio frequency signal amplified by the power amplifier.
Dependencies are inferred from the claim text.