3 ms·
Could it be some kind of fixed per-bucket offset? I wouldn't be surprised if the CCD has all sorts of funky analog stuff going on internally which has differen
by crote 2y ago
Could it be some kind of fixed per-bucket offset?
I wouldn't be surprised if the CCD has all sorts of funky analog stuff going on internally which has different impacts on different samples, which would be incredibly hard to deal with on its own.
However, if this behaviour is merely a fixed offset, it would be fairly easy to compensate for this on the digital side: just do a calibration with a known signal, and the measured offset can be used to reverse its effect in future sampling.
- tverbeure 2y agoCould be. I've already measured with sawtooth and square waveforms to get a better idea about the interleaving and noise, but not yet with a pure DC input. Another possibility is that there's some charge decay which you could calibrate for.
- Retr0id 2y agoI mentioned in another comment, but I started writing an emulator for my TDS 684A's firmware. If I can get it a bit further along (most of the business logic seems to be implemented in smalltalk) then maybe we can answer some of these unknowns by looking at what the calibration routines do.