Determination of operational amplifier input capacitance

[PhdSA]

Hello;

I'm designing a differential amplifier and i need to know its input capacitance. l ask if you can send me a clear tutorial to determine this input capacitance with simulation.
Really, I'm so grateful if you can explain how to determine the input capacitance with simulation.

Regards

 

[danadakk]

https://www.analog.com/en/resources/analog-dialogue/raqs/raq-issue-201.html

How to Measure Op-Amp Input Capacitance to Minimize Noise

The input capacitance of an op amp often lies in the picofarad range, making it difficult to measure because parasitic effects in the test setup distort the result. But, with ...

www.electronicdesign.com

Regards, Dana.