Hello,

   I have a question about the driving ability as shown in the figure below,

   Capacitor Ca is the negative feedback loop and capacitor Cx is the positive feedback loop. When I design the OTA, how many capacitors I should take as the load, is it only Ca, or it should be Ca+Cx, or it is something else? Could anybody give me some comments?

   Thanks.

Hello aaron_do,

   Thank you very much!

   Jacki

An interesting question.

It seems to me that for noise analysis input should be assumed to be AC ground. In this way, it should be Ca+Cx.

But is the input of the whole stage the same as the input of the OTA?