US 12,483,191 B2
Method and apparatus for oscillator frequency calibration
Nicolas Collonville, Biot (FR); and Axel Le Bourhis, Le Cannet (FR)
Assigned to NXP B.V., Eindhoven (NL)
Filed by NXP B.V., Eindhoven (NL)
Filed on May 2, 2023, as Appl. No. 18/310,612.
Claims priority of application No. 22306654 (EP), filed on Nov. 1, 2022.
Prior Publication US 2024/0146242 A1, May 2, 2024
Int. Cl. H03B 5/04 (2006.01)
CPC H03B 5/04 (2013.01) 18 Claims
OG exemplary drawing
 
1. A method for calibrating a free running oscillator in a circuit of an electronic device, the method comprising:
determining that the circuit of the electronic device is in an awake state;
measuring an indication of frequency of the free running oscillator in response to the circuit being in the awake state; and
calibrating a frequency of the free running oscillator based on the indication of frequency and the circuit being in the awake state, wherein the measuring the indication of frequency comprises measuring a pulse count difference of pulses output by the free running oscillator and a reference clock for a number of pulses output by the reference clock in response to the circuit being in the awake state; and the calibrating the frequency of the free running oscillator comprises calibrating the frequency of the free running clock based on a determined pulse count difference and the circuit being in the awake state.