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Is it possible to extend the range of AD7745 to 2nF?

Question asked by praveenkesavan on Apr 16, 2013
Latest reply on Apr 16, 2013 by seanbrown

Hello,

 

I have an application of level measurement where the change in capacitance is from 1nF to 2nF approximately for a measurement range of 0-1000 mm. The required resolution is ~1 mm hence a change in 1pF has to be detected. Whether I can use AD7745 CDC with range extension circuit (http://www.analog.com/en/circuits-from-the-lab/CN0129/vc.html) for this application or any alternatives?

 

Thank you.

 

Regards,

Praveen Kesavan

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