One of my readers posted the following questions in the comment section of MasteringElectronicsDesign.com: An Op Amp Gain Bandwidth Product.

*I am doing a work on fully differential Negative feedback op-amp with capacitive divider configuration. I have some questions and confusions, can you please clarify?*

*What is the difference between closed loop gain and open loop gain, and are they dependent to each other?*

*How can we calculate the unity gain frequency if I have a 3-dB frequency of 100Hz and closed loop gain of 40dB?*

*Does the feedback factor (BETA) has importance with respect to any other parameters?*

*How will it help in finding the closed transfer function of the system assuming the op-amp as a single pole system?*

The answers needed some space, more than the comment section could offer, so here is a post on the topics of op amp open-loop, closed-loop and feedback.