Suitable op-amps/ parameters for subtractor circuits

[oldfoggy]

Hi all,

I would like to know which op-amps are more suitable for an analog voltage subtractor circuit? Are there any parameters of the op-amp that I should take special note of, which has a more crucial effect on the subtractor circuit?

Thanks for your help in advance!

 

[sachooo]

You can use any general purpose Op Amp such as uA741 as long as you don't need very high level of accuracy.
Take care you need +12 & -12 Volt dual supply for OpAmp.
Or you can use LM358 dual Opamp whis works with single 5 to 15 Volt DC supply.

 

[╔(σ_σ)╝]

Well there are things like the slew rate and maximum output voltage to take into consideration. It all depends on how much voltage you want at the output as well as what frequency you will be driving it at.

 

[Bob S]

You should also review the input voltage offset and other similar offset parameters, because they will limit the analog dynamic range. If individual op-amps have an uncorrected 1-mV input voltage offset, then the quadrature input offset for two op-amps is ±1.4 mV. If you need 10 bit equivalent accuracy, then your subtracted signal amplitude should be at least 1.4 volts. So if the maximum linear output range is ±10 volts, your useful dynamic range is only about 10/1.4 = 7:1.

Bob S