[quote]No, the range is quite tight: 20nH-200nH. So this is very narrow, but working frequencies for measurements are quite high.[/quote] You are right - such small coils would require large capacitors to pull the resonance frequency down, which is not recommended. Seems you are bound to RF equipment. I'm much less of an expert here. Perhaps the following way would be workable: have a resonance circuit with a known capacitor use a schmitt trigger to form a rectangular signal use a counter/divider (hardware) to scale down measure period (e.g. with a MSP43x), and map to inductance via frequency Then, I'm at my wit's end...
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