Operational Amplifier
The operational amplifier is a basic analog building block
common to a number of electronic functions performed in instrumentation,
computation and control. Op-amp is basically a differential amplifier whose
function is to amplify the difference between two input signals. Op-amp is
available in IC form.
Ideal Op Amp Characteristics
The ideal operational amplifier is shown in the below fig, and
its equivalent circuit. A signal appearing at the negative terminal V1
is inverted at the output, a signal at the positive terminal V2
appears at the output with no change in sign.