Why video signal from CCD array show extreme vertical jitter

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lingyueqing
Posts: 1
Joined: 02 Mar 2018, 10:13
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Why video signal from CCD array show extreme vertical jitter

Post by lingyueqing »

I am reading a video signal from a CCD array. For some reason I get this extreme vertical jitter. I use decoupling and bypass caps everywhere possible. But it does not seem to be the noise issue. Any one has an idea of what could be the reason of such jitter? The yellow clock signal is just for reference. Here are superimposed frames of the video:

Image

TRIED:

Different illumination intensities - the fluctuations present in the dark too.

Tried different light sources: flashlight, diode lamp, luminescent lamp, laser.

Tried running the microcontroller with the internal clock (no external oscillator).

Tried running the setup from a 12V battery (no mains).

Tried using electronic switches DG642 and EL7156 instead of direct connection to the microcontroller.

Tried switching/interchanging the probes (as you can see, the TTL signal looks just fine).

The oscilloscope and the power supply seem to be grounded since the power sockets have the third 'ground' pin.

Tried three different kinds of CCD arrays.

Do not seem to have any high power electromagentic devices around me.

When I measure a signal from a waveform generator, no fluctuations are present.

I use bypass and decoupling capacitors everywhere I should.

I am seriously stuck. Please, help!!!

Perkin Elmer RL1024PQ sensor

Vishay DG642DY video switch (http://www.kynix.com/Detail/944234/DG642DY.html)

Intersil EL7156 pin driver (datasheet:https://www.intersil.com/content/dam/In ... el7156.pdf)
mzenker
Posts: 1999
Joined: 07 Dec 2009, 11:49
Location: Germany

Re: Why video signal from CCD array show extreme vertical jitter

Post by mzenker »

Hi,

this is a forum for FEM simulations. You will have to look for help elsewhere...

Matthias
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