Calculate the transfer function of an OPAMP circuit

[mmb1999]

Hello All
I have an OPAMP circuit that its output increase steadily without cahnge in the input. I guess the issue is in the transfer function of the circuit and its stability. I want to calculate the transfer function of my circuit but I do not have any idea about that. Could you please help me to calculte the transfer function?

 

[Delta Prime]

. I want to calculate the transfer function of my circuit but I do not have any idea about that.

You describe the circuit but you know what that circuit is called?

Could you please help me to calculte the transfer function?

Sure I willing help you calculate
All the basic operational amplifier configurations.
But it's your job to know what type of operational amplifier it is...
The transfer function is simply an equation to derive the output of a specific type of operational amplifier.

 

[Bluejets]

without cahnge in the input

Are you sure about that as it would depend on the type of hall effect used.

 

[danadak]

Signal Flow Graph to get at T(s).

3.2: Signal Flow Graph

eng.libretexts.org

GitHub - ahmedkotb/sfg.js: Signal Flow Graph Solver in javascript

Signal Flow Graph Solver in javascript. Contribute to ahmedkotb/sfg.js development by creating an account on GitHub.

github.com

https://github.com/search?q=signal%20flow%20graph&type=repositories

GitHub - mtarek97/Signal-Flow-Graph-Solver: A signal flow graph solver made entirely in javascript

A signal flow graph solver made entirely in javascript - mtarek97/Signal-Flow-Graph-Solver

github.com

Or attached.

Your circuit will yield a 3'rd order T(s) as shown, not including the OpAmp internal
pole which would give a 4'th order equation. You can solve using node and Kirchoff,
which quite tedious, especially 3'rd order and above. Or one of the tools above.


Regards, Dana.

 

[danadak]

I have an OPAMP circuit that its output increase steadily without cahnge in the input.

If input to an integrator is left unconnected it will integrate its own bias current,
so you will see a ramp, can be either + or - going ramp, until the output of the
integrator saturates, either close to + supply V or its - supply V.


Regards, Dana.

 

[ramussons]

Hello All
I have an OPAMP circuit that its output increase steadily without cahnge in the input. I guess the issue is in the transfer function of the circuit and its stability. I want to calculate the transfer function of my circuit but I do not have any idea about that. Could you please help me to calculte the transfer function?

What is the output from the Hall sensor? If the Quiescent output of the sensor is not Exactly 2.5 Volts (R1=R2), the output will linearly change to
0 or 5 volts, or
Sensor Quiescent * (R4/R5),
whichever is lower.