Linear CCD Update

Just a quick update. I was going through some boxes that I haven’t unpacked since moving and I found the linear CCD I was experimenting with.

After reviewing some schematics I’d saved and reviewing some datasheets, I’m sort of back up to speed with where I left the project.

I managed to get some traces on my analogue oscilloscope that sort of match the datasheets but the relatively fast timings and the inability to store a trace on my oscilloscope was making things difficult. So, I took the board into work to use one of the good digital oscilloscopes in the workshop and I managed to get the following trace.

Yellow trace is the CCD output signal. Green trace is the transfer gate signal I was using as a trigger signal.

After performing a few tests I am not confident that I have all of the signals or the timing correct. Why I know this is because when I placed small pieces of black tape over the CCD’s lens, I was not seeing a decreases in signal intensity to match the number of pieces of black tape. Also, when I shaded a quarter of the CCD, the signal output for all the CCD’s pixels decreased in output value rather than the pixels that were shaded.

Anyway, I’m learning a few things about analogue electronics which is good. So far I’ve needed to improve my knowledge on op-amp circuits and I’ve been using a sample and hold circuit to help isolate the specific pixel output signal from the entire output waveform.

Anywho, I’m sure I’ll share more details as they arise.

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