Monitoring of inductor behavior
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsJohn P. LESSO, John L. MELANSON
Life of this patent
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Abstract
This application relates to methods and apparatus for compensating for distortion in an output drive signal of a switched-mode amplifier which arises from non-linearity of an inductor in an output path for the drive signal. A distortion predictor is configured to predict the distortion in the output drive signal. The distortion predictor has a current predictor configured to determine a predicted current in the inductor based on, at least, an indication of an input voltage for the inductor. A model then models the distortion based on the predicted current and a corrector determines a correction term based on the predicted distortion that can be additively applied to an input signal to at least partly compensate for the distortion in the drive signal.
Claims21
An apparatus for compensating for distortion in an output drive signal of a switched-mode amplifier which arises from non-linearity of an inductor in an output path for the drive signal, the apparatus comprising:
- a distortion predictor configured to predict the distortion in the output drive signal;
- where the distortion predictor comprises a current predictor configured to determine a predicted current in the inductor based on at least an indication of an input voltage for the inductor, and a model for modelling the distortion based on the predicted current;
- a corrector configured to determine a correction term based on the predicted distortion that can be additively applied to an input signal to at least partly compensate for the distortion in the drive signal.
An apparatus for compensating for distortion in an output drive signal of a switched-mode amplifier which arises from non-linearity of an inductor in an output path for the drive signal, the apparatus comprising:
- a distortion predictor configured to predict the distortion in the output drive signal;
- and
- a corrector configured to determine a correction term based on the predicted distortion that can be additively applied to an input signal to at least partly compensate for the distortion in the drive signal.
A predictor for predicting a current in an inductor, the current predictor comprising a leaky integrator configured to integrate an indication of a voltage across the integrator and a divider for dividing the output of the integrator by an estimate of an inductance of the inductor.
Dependencies are inferred from the claim text.