Can a non-inverting op-amp circuit have Rf=Ri = 0? And what is its purpose?

  • Thread starter Thread starter Anabelle37
  • Start date Start date
  • Tags Tags
    Amplifier
Click For Summary
SUMMARY

A non-inverting op-amp circuit can function with Rf=Ri=0, resulting in a gain of 1. This configuration serves a specific purpose as a voltage buffer, isolating parts of a system that require a certain impedance. The circuit operates effectively under ideal op-amp rules, making it straightforward to analyze using node-voltage techniques. Understanding this concept is crucial for those working with operational amplifiers in practical applications.

PREREQUISITES
  • Understanding of non-inverting op-amp configurations
  • Familiarity with ideal op-amp rules
  • Knowledge of node-voltage analysis
  • Basic concepts of impedance in electrical circuits
NEXT STEPS
  • Study the principles of voltage followers in op-amp circuits
  • Learn about the implications of gain in non-inverting amplifiers
  • Explore practical applications of op-amps in circuit design
  • Investigate the effects of varying resistor values in feedback loops
USEFUL FOR

Electronics students, circuit designers, and engineers interested in operational amplifier applications and impedance management in electronic systems.

Anabelle37
Messages
35
Reaction score
0

Homework Statement



How does a non-inverting op-amp circuit work?

What happens if you make a non-inverting amplifier with Rf=Ri = 0? What would be the
purpose of such a circuit?
 
Physics news on Phys.org
Yes, there is a point to having R1=R2=0! You can isolate a part of a system that might need to have a certain impedance by placing a voltage buffer (sometimes also called a voltage follower) in the circuit.

As far as how the non-inverting amplifier works, do a node-voltage analysis using ideal op-amp rules. This is one of the simplest amplifiers to solve, so you ought to know how to do it.
 

Similar threads

Engineering Why is the voltage source high potential into node 1 at -12 V in this op amp problem?
  • · Replies 15 ·
Replies
15
Views
3K
Any advice to make this Op-Amp temperature controller circuit work?
  • · Replies 34 ·
2
Replies
34
Views
4K
How would I draw this non-inverting amplifier?
  • · Replies 6 ·
Replies
6
Views
3K
Op Amp Vout Calculation for Non-Inverting Configuration
  • · Replies 4 ·
Replies
4
Views
3K
Engineering Circuit input impedance with ground in an OP Amp circuit
  • · Replies 4 ·
Replies
4
Views
3K
Engineering Calculating the unknown voltages in ideal op-amp circuits
  • · Replies 13 ·
Replies
13
Views
3K
Op-amp Oscillator Circuit Design (10-50 MHz)
  • · Replies 6 ·
Replies
6
Views
3K
Calculating Unknown Voltages on Op Amp Circuits
  • · Replies 9 ·
Replies
9
Views
2K
How to Calculate the Complex Op Amp in Circuit Diagram
  • · Replies 8 ·
Replies
8
Views
3K
Engineering Time Constant of an Opamp Circuit
  • · Replies 20 ·
Replies
20
Views
7K