soleilsword
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I'm looking for a highly accurate phase detector for my capacitive sensing application. In the application, the capacitance is in the range of 1 ~ 10 pF. I've been able to get the capacitance via analog device's AD7745. However, I was requested to have the dissipation factor measured as well. I've been trying to seek a chip to do the job, unfortunately not yet. I've came up with the idea of using a phase detector, with the information of which, I'll be able to calculate an approximate value of dissipation factor myself later on. So my question is, is there such a phase detector that can detect the phase difference between the voltage and current across the capacitive sensor with a very high accuracy? with accuracy I mean: the capacitor is a nearly ideal capacitor with dissipation factor of less than 0.001, so the most interesting part of phase difference is between 89 ~ 90 degrees...
The interested frequency range is DC ~ 1Mhz.
thanks !
The interested frequency range is DC ~ 1Mhz.
thanks !