Switching amplifier circuitry
AssigneeCirrus Logic International Semiconductor Ltd.
InventorsMatthew BEARDSWORTH, John L. MELANSON
Life of this patent
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Abstract
Switching amplifier circuitry for driving an inductive load, the switching amplifier circuitry comprising modulator circuitry and output stage circuitry, wherein the switching amplifier circuitry is configured to: while the modulator circuitry is outputting a modulated output signal that gives rise to ripple current in the load: adjust a switching frequency of the modulator circuitry over a predetermined range of frequencies; monitor a power of the switching amplifier circuitry as the switching frequency is adjusted over the predetermined range of frequencies; and select, as an operational switching frequency for the modulator circuitry, a frequency within the predetermined range of frequencies at which the monitored power meets a predefined criterion.
Claims21
-29. (canceled)
Switching amplifier circuitry for driving an inductive load, the switching amplifier circuitry comprising:
- modulator circuitry;
- and
- output stage circuitry, wherein the switching amplifier circuitry is configured to:
- while the modulator circuitry is outputting a modulated output signal that gives rise to ripple current in the load:
- identify a frequency, within a predefined range of frequencies, at which a power associated with the ripple current is minimised
- select, as an operating switching frequency for the modulator circuitry, the identified frequency.
Switching amplifier circuitry for driving an inductive load, the switching amplifier circuitry comprising:
- modulator circuitry;
- and
- output stage circuitry, wherein the switching amplifier circuitry is configured to:
- while the modulator circuitry is outputting a modulated output signal that gives rise to ripple current in the load:
- adjust a switching frequency of the modulator circuitry over a predetermined range of frequencies;
- monitor a power associated with the ripple current as the switching frequency is adjusted over the predetermined range of frequencies;
- and
- select, as an operational switching frequency for the modulator circuitry, a frequency within the predetermined range of frequencies at which the monitored power associated with the ripple current meets a predefined criterion.
Switching amplifier circuitry for driving an inductive load, the switching amplifier circuitry comprising:
- modulator circuitry;
- and
- output stage circuitry, wherein the switching amplifier circuitry is configured to:
- while the modulator circuitry is outputting a modulated output signal that gives rise to ripple current in the load:
- adjust a switching frequency of the modulator circuitry over a predetermined range of frequencies;
- monitor a power of the switching amplifier circuitry as the switching frequency is adjusted over the predetermined range of frequencies;
- and
- select, as an operational switching frequency for the modulator circuitry, a frequency within the predetermined range of frequencies at which the monitored power meets a predefined criterion.
Dependencies are inferred from the claim text.