	US 12,445,098 B2
	Switching amplifier circuitry
Matthew Beardsworth, Austin, TX (US); and John L. Melanson, Austin, TX (US)
Assigned to Cirrus Logic Inc., Austin, TX (US)
Filed by Cirrus Logic International Semiconductor Ltd., Edinburgh (GB)
Filed on Aug. 11, 2022, as Appl. No. 17/885,719.
Prior Publication US 2024/0056039 A1, Feb. 15, 2024
Int. Cl. H03F 3/217 (2006.01); H03F 1/02 (2006.01)

CPC H03F 3/2173 (2013.01) [H03F 1/0222 (2013.01); H03F 1/0233 (2013.01); H03F 1/025 (2013.01); H03F 1/0255 (2013.01); H03F 2200/105 (2013.01); H03F 2200/351 (2013.01); H03F 2200/459 (2013.01); H03F 2200/462 (2013.01); H03F 2200/471 (2013.01); H03F 2200/481 (2013.01)]

28 Claims

1. Switching amplifier circuitry for driving a 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 an input power to 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 input power meets a predefined criterion.