sharing power supply for analog and digital circuits for a CMOS image sensor

May 18, 2006 1 Replies
M

hi,



im using a CMOS image sensor for a project. im using the same 3.3V regulated supply for both of its analog and digital circuits. when operated, sensor tends to reset itself when exposed to heavy light. ( im assuming its resetting it self, because when internal register values are inspected, they give default values after bright light exposure). if anny one has any such experiances please let me know. can this happen becuase im sharing the same supply between both analog and digital circuits?


thnak you CMOS



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J

When I designed a CCD camera way back in the last century I also shared power between digital and analog. After all, the "digital" phase driver signals were going onto the chip so they had to be as clean as a whistle.

Unless something is mentioned in the sensor data sheet I believe a reset upon too much exposure is not normal. Look at the supply rail with a fast scope on AC and cranked up a bit. Do you see any spikes or dips on there?

Regards, Joerg

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