![ideal op amp offset vout ideal op amp offset vout](https://slidetodoc.com/presentation_image_h/8a7fc816f2a8f8b972b20f94656c3a2e/image-38.jpg)
Real op-amps have an input offset voltage caused by imperfect matching between the input transistors.
![ideal op amp offset vout ideal op amp offset vout](https://www.analog.com/-/media/images/analog-dialogue/en/volume-45/number-2/articles/simple-op-amp-measurements/simple-op-amp-measurements_fig_01.png)
![ideal op amp offset vout ideal op amp offset vout](https://i.stack.imgur.com/jTJqc.png)
Let's look at the venerable uA741C datasheet. The next question, is what are all the different reasons that Vout is not equal to 101 times Vin? If not, then we go into triage mode and see if there's any reason we should not end the interview sooner rather than later. Presumably the interview candidate responds by working out the problem and calculating Vout = Vin * (1 + R2/R1) = 101mV. Real op-amps have limitations.Īnd so one of the questions I ask on technical interviews is the following: Op-amp is short for operational amplifier, and we start our education on them by learning about these mythical beasts, which have the following properties:Īnd on top of it all, they will do whatever it takes to change their output in order to make their two inputs equal.īut they don't exist. Somewhere, along with unicorns and the Loch Ness Monster, lies a small colony of ideal op-amps.