Integrating operational amplifier

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Discussion Overview

The discussion revolves around calculating the output voltage of an operational amplifier configured as an integrator, specifically when a resistor and capacitor are added in series to the inverting terminal. The focus is on understanding how to approach the circuit and formulating the appropriate equations.

Discussion Character

  • Homework-related
  • Mathematical reasoning
  • Technical explanation

Main Points Raised

  • One participant expresses uncertainty about how to approach the circuit with an RC combination at the inverting terminal of the integrating op-amp.
  • Another participant suggests writing the KCL equation at the inverting input and notes that the impedance is the sum of the resistor and capacitor impedances.
  • A participant indicates they can solve the problem for a standard integrating op-amp circuit but struggles with the added resistor and capacitor, questioning how to form the equation.
  • One participant challenges the formulation of the KCL equation presented by another, stating it is not a valid KCL equation.

Areas of Agreement / Disagreement

Participants do not appear to reach a consensus, as there are differing views on the correct formulation of the KCL equation and how to approach the modified circuit.

Contextual Notes

There are unresolved aspects regarding the assumptions made in the circuit analysis, particularly concerning the application of KCL and the impact of the added components on the integrator's behavior.

maven sharma
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Homework Statement


Calculate the output voltage of the amplifier
lWWX9.jpg

2. Homework Equations
classic_circuit_1000-jpg.jpg
[/B]
https://www.electronics-tutorials.ws/opamp/opamp32.gif

The Attempt at a Solution


I do not know how to approach a circuit with RC in series to inverting terminal of integrating op amp
 

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maven sharma said:
I do not know how to approach a circuit with RC in series to inverting terminal of integrating op amp
You still write the KCL equation at the "-" input to the opamp. The impedance to the right is just the sum of the impedances of the resistor and capacitor. Can you show us that equation and then how you would solve it to get Vo/Vi? :smile:
 
berkeman said:
You still write the KCL equation at the "-" input to the opamp. The impedance to the right is just the sum of the impedances of the resistor and capacitor. Can you show us that equation and then how you would solve it to get Vo/Vi? :smile:
upload_2018-5-2_18-2-12.png


yeah i can do it when its standard integrating op amp circuit but when a resister ans capacitor is added(see below image) to the inverting terminal in feedback then i don't know how to form equation
lwwx9-jpg.jpg
 

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maven sharma said:
View attachment 225039

yeah i can do it when its standard integrating op amp circuit but when a resister ans capacitor is added(see below image) to the inverting terminal in feedback then i don't know how to form equation
View attachment 225040
upload_2018-5-2_18-24-36.jpeg

Am I right?
 

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