How to build op amp

How to build op amp as shown in figure.

[PIRC]

It’s available in Matlab toolbox. Otherwise develop op amp with help of transistors

Answer 1

[Mohsen Aleenejad]

Hi Khald,

Do you have access to Simscape library? You can find the built in block in Simscape library.

Best

Mohsen

[Mohsen Aleenejad]

[Mohsen Aleenejad]

If you are trying to model that in the Simulink, then you should see if you can find a relacement block for that or not. For example, sometimes the op-amp is used as a comprator, in this case you can find it in the simulink library. Otherwise, you can build it by using a Sum and a Gain block.

SUM is in Simulink under "Math Operations" or just type sum in search box of the simulink library. Under list of signals type "+-" without quotes of course as opamp has both inverting and noninverting input. Result is difference of the inputs. Now add amplifier and set gain to something large such as 100000 for example (this is gain A). connect output of sum to input of amp. you get simple

Vout = A*(V1 - V2)

where

A = gain

V1, V2 are inputs to SUM block

[khald Ali]

Is it correct like this?

[Mohsen Aleenejad]

If you are simulating your model is Specialized Power System, then follow the circuit given in this picture: