US 11,736,032 B1
Electronic device with frequency dithering
Sujeet Milind Patole, Cupertino, CA (US); Cheung-Wei Lam, Mountain View, CA (US); and Mahmoud N Mahmoud, Dublin, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on Feb. 3, 2023, as Appl. No. 18/164,291.
Claims priority of provisional application 63/402,242, filed on Aug. 30, 2022.
Int. Cl. H02M 7/48 (2007.01); H02M 1/12 (2006.01); H02M 7/529 (2006.01); H02M 1/00 (2006.01)
CPC H02M 7/4803 (2021.05) [H02M 1/0041 (2021.05); H02M 1/12 (2013.01); H02M 7/529 (2013.01)] 21 Claims
OG exemplary drawing
 
1. An electronic device comprising:
an inverter configured to receive a dithered clock signal and output corresponding alternating current signals; and
control circuitry configured to obtain the dithered clock signal using a modulating signal and a clock signal, wherein:
the dithered clock signal has at least three different frequency levels during a repeated cycle of the modulating signal;
the at least three different frequency levels include a fundamental frequency, a first frequency that is lower than the fundamental frequency, and a second frequency that is higher than the fundamental frequency; and
the dithered clock signal is, during the repeated cycle of the modulating signal, at the fundamental frequency for fewer total periods than at the first frequency and for fewer total periods than at the second frequency.