Light source frequency detection circuit for image sensor

Details Light source frequency detection circuit for image sensor Light source frequency detection circuit for image sensor

2007-09-14

2009-10-20

Pyo, Kevin (Department: 2878)

Radiant energy

Photocells; circuits and apparatus

Photocell controlled circuit

C250S2140LS, C250S208100, C348S226100, C348S228100

Reexamination Certificate

active

07605359

ABSTRACT:
An apparatus for measuring the power frequency of a light source includes a photo-sensor, a modulator, and a logic unit. The photo-sensor generates an electrical signal that is responsive to light incident thereon from the light source. The modulator generates a modulated signal based on the electrical signal that toggles at a rate substantially proportional to the power frequency of the light source. The logic unit is coupled to receive the modulated signal and determine its toggling frequency.

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