Pseudo-envelope following feedback delay compensation
AssigneeQorvo US, Inc.
InventorsNadim Khlat, Michael R. Kay, Philippe Gorisse
Life of this patent
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Abstract
A switch mode power supply converter and a feedback delay compensation circuit are disclosed. The switch mode power supply converter has a switching voltage output and provides a switching voltage at the switching voltage output, such that a target voltage for a power amplifier supply voltage at a power amplifier supply output is based on the switching voltage. Further, the switching voltage is based on an early indication of a change of the target voltage. The feedback delay compensation circuit provides the early indication of the change of the target voltage.
Claims19
Circuitry comprising:
- a switch mode power supply converter having a switching voltage output and configured to provide a switching voltage at the switching voltage output, such that a target voltage for a power amplifier supply voltage at a power amplifier supply output is based on the switching voltage, which is based on an early indication of a change of the target voltage;
- and
- a feedback delay compensation circuit comprising a high pass filter configured to high pass filter a VRAMP signal to generate a derivative of the VRAMP signal, such that the feedback delay compensation circuit is configured to:
- generate a feedback delay compensation signal based on the derivative of the VRAMP signal;
- and
- provide the feedback delay compensation signal to the switch mode power supply converter as the early indication of the change of the target voltage.
Circuitry comprising:
- a switch mode power supply converter having a switching voltage output and configured to provide a switching voltage at the switching voltage output, such that a target voltage for a power amplifier supply voltage at a power amplifier supply output is based on the switching voltage, which is based on an early indication of a change of the target voltage;
- and
- a feedback delay compensation circuit, which comprises a transconductance circuit having a transconductance, and is configured to:
- generate a feedback delay compensation signal based on a derivative of a VRAMP signal and the transconductance;
- and
- provide the feedback delay compensation signal to the switch mode power supply converter as the early indication of the change of the target voltage.
A method comprising:
- providing a switching voltage at a switching voltage output, such that a target voltage for a power amplifier supply voltage at a power amplifier supply output is based on the switching voltage, which is based on an early indication of a change of the target voltage;
- high pass filtering a VRAMP signal to generate a derivative of the VRAMP signal;
- generating a feedback delay compensation signal based on the derivative of the VRAMP signal;
- and
- providing the feedback delay compensation signal as the early indication of the change of the target voltage.
Dependencies are inferred from the claim text.