US 11,852,528 B2
Device and method for measuring of a flickering frequency
Mickael Guene, Grenoble (FR); Salim Bouchene, Seyssinet-Pariset (FR); Cedric Grospellier, Grenoble (FR); Jean-Jacques Rouger, Grenoble (FR); and Pascal Mellot, Grenoble (FR)
Assigned to STMicroelectronics (Grenoble 2) SAS, Grenoble (FR)
Filed by STMicroelectronics (Grenoble 2) SAS, Grenoble (FR)
Filed on Nov. 24, 2020, as Appl. No. 17/102,522.
Claims priority of application No. 1913542 (FR), filed on Nov. 29, 2019.
Prior Publication US 2021/0164832 A1, Jun. 3, 2021
Int. Cl. G01J 1/44 (2006.01)
CPC G01J 1/44 (2013.01) 20 Claims
OG exemplary drawing
 
1. A device, comprising:
a flicker detector circuit configured to detect light radiation signals from a light source and generate successive samples representing the light radiation signals; and
a processor coupled to the flicker detector circuit, the processor comprising a phase lock loop (PLL) circuit, the processor configured to:
determine a frequency of the light radiation signals using the PLL circuit and the successive samples generated by the flicker detector circuit, and
generate a periodic digital signal synchronized in phase with the light radiation signals and having a frequency equal to the frequency of the light radiation signals.