electrical4u.com logo Home MCQ Engineering Calculators Videos Basic Electrical Circuit Theories Electrical Laws Materials Batteries Illumination Generation Transmission Distribution Switchgear Protection Measurement Control System Utilities Safety Transformer Motor Generator Electrical Drives Electronics Devices Power Electronics Digital Electronics Biomedical Instrumentation

Ideal Operational Amplifier or Ideal Op Amp

Published on 24/2/2012 & updated on 5/9/2018
HOME / CIRCUIT THEORY / OP-AMP
We know that, the input resistance of an op amp must be very high where as the output resistance should be quite low. An op amp should also have very high open loop gain. In ideal cases, the input resistance and open loop gain of an op amp should be infinity whereas the output resistance would be zero. So an ideal op amp should have following characteristics.
CharacteristicValue
Open Loop Gain (A)
Input Resistance
Output Resistance0
Bandwith of Operation
Offset Voltage0

So, an ideal op amp is defined as, a differential amplifier with infinite open loop gain, infinite input resistance and zero output resistance. The ideal op amp has zero input current. This is because of infinite input resistance. As the input resistance of ideal op amp is infinite, an open circuit exists at input, hence current at both input terminals is zero. There is no current through the input resistance, there will be no voltage drop between the input terminals. Hence no offset voltage appears across the inputs of an ideal operational amplifier.

Related pages
Ideal Operational Amplifier or Ideal Op Amp

If v1 and v2 are the voltages of inverting and non-inverting terminals of op amp, and v1 = v2 then in ideal case,

The bandwidth of operation of an ideal op-amp is also infinite. That means the op-amp perform its function for all ranges of frequencies of operation.




Please Rate this Article
0
⚑ 0 total
5
4
3
2
1


New Articles
More Articles on Circuit Theory
Circuit and NetworkCircuit TheoremCircuit AnalysisTwo Port NetworkRL CircuitMatrixRLC Circuit
Articles Categories
Write for Us
Home
Basic Electrical
Electric Transformer
Electric Generator
Electric Motor
Electrical MCQ
Engineering Calculators
Video Lectures
Electrical Generation
Electric Transmission
Switchgear
Electric Protection
Electrical Measurement
Electronics Devices
Power Electronics
Digital Electronics