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Calculate the transfer function of an OPAMP circuit

mmb1999

Mar 31, 2024
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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?
 

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Delta Prime

Jul 29, 2020
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. 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.
photo_1711902752286.png
 

danadak

Feb 19, 2021
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Signal Flow Graph to get at T(s).





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.
 

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danadak

Feb 19, 2021
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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

Jun 10, 2014
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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.
 
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