Electronics - Operational Amplifiers - Discussion


An ideal operational amplifier has

[A]. infinite output impedance
[B]. zero input impedance
[C]. infinite bandwidth
[D]. All of the above

Answer: Option C


No answer description available for this question.

Meda said: (May 11, 2011)  
Ideal oprational amplifier has

- open loop Gain infinte
- input impedance infinite
- output impedence Zero
- bandwidth infinite
- offset voltave zero

Biswasish Das said: (Aug 28, 2011)  
Thanks meda for the details.

Niranjan said: (Nov 16, 2011)  
What is Offset voltage?

Amit said: (Nov 19, 2011)  
Input offset voltage is the equivalent voltage at the input of an operational amplifier. If an amplifier has a voltage gain of ten and an input offset voltage of 10 microvolts, a level of 100 microvolts will appear at the output with no input. Manufacturers try to design an op amp so the input offset voltage is as small as possible to minimize this error voltage at the output of the amplifier, especially for applications where small voltages are being amplified.

Komal said: (Jun 6, 2012)  
Characteristics of an ideal operational amplifier are:
1.Infinite Open Loop Gain
2.Infinite Input Impedance
3.Zero Output Impedance
4.Infinite Bandwidth
5.Zero Output Offset
6.Zero Noise Contribution

Bilal said: (Dec 7, 2012)  
What is open loop gain?

Bilal said: (Dec 7, 2012)  
Open loop gain is the gain of op amp without feedback.

Priya said: (Dec 19, 2012)  
Thanks you friends for the details

Ram Dular said: (Aug 7, 2013)  
What is infinite bandwidth?

Pandithuraieaswari said: (Sep 24, 2013)  
What is amplifier?

Gurdeep Rai said: (Sep 26, 2013)  
Infinite bandwidth means op-amp work within all range of frequencies, but practically it is not possible.

Elsiena said: (Nov 7, 2013)  
Amplifier is an electronic device that increases the power of a signal. This occur due to the conversion of energy from a power supply and controlling the output to match the input signal shape but with a larger amplitude. When this is done, then an amplifier can be described as modulator of the output signal of the power supply.

Nupur said: (Nov 7, 2013)  
What is impedance? please define in simple words.

Dips said: (Feb 25, 2014)  
Impedance is like as resistance of capacitor and inductor.

Musab said: (Sep 6, 2014)  
Open loop gain is the gain of op amp without feedback. So what is comparator?

T .Jayaraju said: (Mar 4, 2015)  
Comparator is a device to compare two signals. A and B are two signals it compare three conditions.

i.e A>B, A<B, A = B. Depending on the values it gives output.

Zaheer Abbas said: (Apr 6, 2015)  
What is the actual meaning of the Word Offset Output? Please in details, I want it's answer.

Keshav said: (Apr 23, 2015)  
Amplifier is electronics devices save output energy and give (save energy) to input energy with higher amplitude it's mean transmission energy between output energy and input (power supply).

Tamim said: (May 18, 2015)  
Offset output : Showing some error voltage on output without input.

Anshul said: (Sep 24, 2015)  
Hi Meda and Komal,

I have a doubt. The Gain of OPAMP is infinite. And we know that GBW product is always constant. Then how it is possible for OPAMP to have infinite bandwidth too?

Pravin said: (Jan 8, 2016)  
In what loop gain is maximum?

Ramesh said: (Mar 24, 2016)  
What is the difference between resistance and impedance?

Umar Farooq said: (May 29, 2016)  
By its very nature a DC circuit will not exhibit any form of Reactance, therefore, opposition to current flow will always be measured in Resistance.

Reactance exists in two forms, Capacitive & Inductive. Impedance can, therefore, be thought of as the opposition of electrical current flow in an AC circuit.

Arif said: (Aug 3, 2016)  
Why we need negative feedback?

Sharmeen said: (Aug 14, 2016)  
Negative feedback is used to stabilize voltage gain, decrease o/p impedance, increase i/p impedance, decrease distortion, increase bandwidth.

Chetan said: (Jan 12, 2017)  
Thank you all for the explanation.

Abhishek said: (Jan 18, 2017)  
Why the input impedance is infinity?

Why should we take this condition?

Saim said: (Feb 22, 2017)  
Op_amp has large input impedance to avoid loading effect. If Op_amp has very low input impedance, it would draw significant amount of current into it. It would act as large load on the circuit.

The fact that op_amp high i/p impedance ensure that it consume very little or no current from circuit.

Tamilan said: (May 1, 2017)  
1. High voltage gain.
2. Perfect balance V1 = V2.

These characteristics are also IDEAL OPAMP.

Deepak said: (Jul 16, 2017)  
Is it possible to an op-amp have finite Input resistance and zero input offset voltage simultaneously?

Archana said: (Oct 7, 2017)  
What is an operational amplifier?

Aneesh Malappuram said: (Dec 14, 2017)  
Operational amplifier is an amplifier which can be used to perform mathematical operations like integration, differentiation etc.

Ramesh said: (Mar 13, 2018)  
I have a small doubt in ideal opamp in case opamp has high input impedance so how the current Will flow in opamp?

Manoj Patel said: (Sep 8, 2019)  
An ideal opamp is used to make an inverting amplifier. The input terminals of the opamp are at the same potential difference.

Post your comments here:

Name *:

Email   : (optional)

» Your comments will be displayed only after manual approval.