Thursday, 10 October 2013

Open Loop Operation of Op Amp

An open loop operation of op amp which is hardly seen used this way can be studied in MATLAB with it's responses.
                                                          A_{\text{OL}}=\frac{V_{\text{out}}}{\left(V^+-V^-\right)}
An op amp can have open loop gain equal to 10^5.

The MATLAB simulation circuit which can be used is .....


This circuit can be drawn in MATLAB in it's model. MATLAB's model can approached by using
"Alt + F + M " on command window of the MATLAB. In order to get above used components you have to surf  "Simulink Library Browser" of MATLAB, for which all you need to do is to type 'simulink' in your MATLAB command window.

Simulating the above circuit we get a beautiful response in the Scope as...


Let the time period of simulation be set to 1 second and gain A be set to 10. Change the values of gain A to see change in response.

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