[sdiy] Digital accumulator VCO core?

Mattias Rickardsson mr at analogue.org
Thu Feb 11 13:32:42 CET 2021

Den tors 11 feb. 2021 08:48cheater cheater <cheater00social at gmail.com>

> Here's one thing I've been wondering about. Is there a form of ADC
> where every sample represents the total charge that passed through a
> conductor since the last sample? Normally, an ADC will only sample
> voltage (or current) at the time of sampling, but we don't really know
> anything about what happened between sampling intervals. If we assume
> that the current was roughly constant during the sampling, that's
> fine. But if it changed during that time, then we have to do some sort
> of interpolation. Even if we do a linear interpolation, maybe the
> current going through the conductor was concave or convex. Being able
> to sample the total charge going through a cap would be much easier,
> since I'd be converting the input data into a charge amount anyways
> (to be added to the virtual capacitor).

This is essentially what an anti-aliasing filter does for you.

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