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ADA4528 Rout

Question asked by Jorge on Aug 14, 2011
Latest reply on Aug 15, 2011 by VickyW

Hi,

 

I am working with the operational amplifier ADA4528 and I am facing some instability problems due to the capacitive load.

 

After some research, I found the article “Practical Techniques to Avoid Instability Due to Capacitive Loading". I decided that circuit of the figure 3 called in-the loop compensation circuit in page 1 of this article it is what I want to use for my application.

 

My question is, what it is the Rout of the ADA4528. How I can find this value?

 

On the other hand, I wonder if you know how they came-out with the equation in page 2 (up-right corner): f-3dB=1/2pi(Cf*Rf). I don’t understand how the bandwidth will be determined only by Cf and Rf. Why the other external elements such as Rx and CL do not affect the bandwidth?

 

Thank you very much for your assistance and your time.

 

Sincerely,

 

 

Jorge Reynaga

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