Envelope tracking power amplifier apparatus
AssigneeQorvo US, Inc.
InventorsNadim Khlat, Arthur Nguyen
Life of this patent
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Abstract
An envelope tracking (ET) power amplifier apparatus is provided. The ET power amplifier apparatus includes an amplifier circuit configured to amplify a radio frequency (RF) signal based on an ET voltage and a tracker circuit configured to generate the ET voltage based on an ET target voltage. The ET power amplifier apparatus also includes a control circuit. The control circuit is configured to dynamically determine a voltage standing wave ratio (VSWR) change at a voltage output relative to a nominal VSWR and cause an adjustment to the ET voltage. By dynamically determining the VSWR change and adjusting the ET voltage in response to the VSWR change, the amplifier circuit can operate under a required EVM threshold across all phase angles of the RF signal.
Claims20
An envelope tracking (ET) power amplifier apparatus comprising:
- a tracker circuit configured to generate an ET voltage at a voltage output based on an ET target voltage;
- an amplifier circuit coupled to the voltage output and configured to amplify a radio frequency (RF) signal based on the ET voltage;
- and
- a control circuit configured to:
- determine a voltage standing wave ratio (VSWR) at the voltage output;
- and
- cause an adjustment to the ET target voltage if the VSWR at the voltage output is different from a nominal VSWR.
Dependencies are inferred from the claim text.