It's more or less widely known that especially high-capacitance ceramic capacitors have significantly less capacitance at their rated voltage than at 0V. While this effect is detrimental for bypass applications, has anyone ever turned that effect into something useful?
I was thinking of using this effect to make a variable capacitor for a VCO or maybe getting some use out of the non-exponential RC charge characteristic.
@karotte you can abuse this to create some interesting filter effects - modify the gain going into an RC filter, then undo the gain after. the filter cutoff ends up being modulated.
@gsuberland@karotte
Unfortunately I think it is likely too temperature dependent to do that.
But it could be interesting to see.
A 1:47AM thought, could the body diode be used to measure the die temperature?
Then you'd have the built in temperature sensor for temperature compensation as well.
But back to DTC's. So far all of them that I have seen used a pile of switched capacitors.
Or were just ST8P switches with "bring your own capacitors".
@ftg@karotte hmm, possibly if the package has a separate body terminal? although I don't know if the forward IV curve or reverse leakage current over the body diode varies with Vds or Vgs in the subthreshold region.
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