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Determine op amp's input capacitance

Posted: 09 Sep 2011     Print Version  Bookmark and Share

Keywords:op amps  input capacitance 

Applications such as smoke detectors, photodiode transimpedance amplifiers, medical instrumentation, industrial control systems, and the piezo-sensor interface need op amps with low input capacitance. Minimising input capacitance can also increase the frequency of a pole in the feedback path until it has a negligible effect on a circuit. Measuring the input capacitance of an op amp is not trivial, especially if the value is only a few picofarads. Such low values also present difficulties in screening the op amps during production testing. This design idea explains how to accurately determine the input capacitance for any op amp.

View the PDF document for more information.

Originally published by Maxim Integrated Products at as "Measure the Input Capacitance of an Op Amp".

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