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LDC1101: Effect of different materials on Rp measurements.

jack_874
Prodigy 155 points
Part Number: LDC1101


Hello all,

I want some advice on target design for Rp measurement, ie, how different materials affect the Rp measurement. The application is identification of metal composition of the target. I have gone through app note SNOA957 : LDC Target Design, but it focuses more on the frequency shifts/inductive effects of materials.

~jack

  • 0
    TI__Genius 13650 points
    Hello Jack,
    the effectiveness of metals as targets for RP measurements is determined primarily by its conductivity. I'm afraid we don't have RP measurement characterization data for RP measurements. As with L measurements, copper and aluminum make excellent targets, but stainless steels are also common target choices.
    Most applications use L measurements (except measurements that require both L and RP). In most applications, L-measurements do not need temperature compensation while RP measurements almost always do due to the temperature coefficient of the conductivity of the metal. Is there a reason why you prefer to use RP measurements over L measurements?