What's the difference between normal OpAmp and this Instrument OpAmp?

[davyzhu]

Hello all,

I found this word few days ago at Analog Devices's website, but what does 'Instrument OpAmp' meam?

And what's the difference between normal OpAmp and this Instrument OpAmp?

Regards,

Davy Zhu

 

[E-design]

instrument op amp

Normally very low noise, offset and input currents.

 

[picotube]

instrument differential op amp

Instrumentation amplifier provides HIGHER CMRR, which is good for remove common mode noise.

 

[djalli]

good opamp for instrument preamplifier

General Purpose op-amp can serve the role of instrumentation amplifier which costs than general-pupose op-amp but there is more to it.

To add to previous guys is that instrumentation amplifier has features other guys mentioned especially CMRR value which distinguish it from other op-amps. Plus it has high input impedance.

Instrumentation amplifier is a differential voltage op-amp loosely said while this can be contructed with 741's for example but is easy to build the thing as one chip rather than having two,three,four opamps in circuitry.

One more thing: if you create a differential voltage circuit using 741 opamp what would be its input impedance? Think about it. Visualize the schematic. Add resistors, do you really have high input impedance?

 

[Sherif zakaria]

instrument opamp

i thik u can read this report then u know every thing about it

 

[djalli]

instrument op-amp

Sherif zakaria saw your report, it is good tutorial (a detailed report) for everyone who wants to learn for instrumentation op-amps in microelectronics. I recommend it to initiator of this thread to read it.
Good work!

 

[bittware]

instrumentation op amp circuit

Generally speaking, you can use three identical ordinary Op-Amp to construct a so called instrument Op-Amp in order to obtain better CMRR resulting from its symmetry structucture.

 

[AartDeGeus]

instrument opamps

An instrumentation amplifier is a type of operational amplifier that has been specifically designed to have characteristics suitable for use in measurement and test equipment. These characteristics include very low d.c. offset, low drift, low noise, very high open loop gain, very high common mode rejection, and very high input impedances. They are used where great accuracy and stability of a circuit both short and long term are required.

 

[maharshi_qis]

op-amp instrument

The main thing abt instrument opamp is it has no loading effects..

 

[nguyennam]

quad op amp instrument

Plus, instrumentation op amp has more even and linear gain within the whole bandwith in comparison with the GP op amp.

nguyennam

 

[Learner]

using op-amp of the instrument

Have a read of this, you questions and more are explained here...

**broken link removed**

Chapter I - In-Amp Basic
Chapter II - Inside an Instrumentation Amplifier