Definition of Ideal Op Ampand its Characteristics
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 V 1 is inverted at the output, a signal at the positive terminal V 2 appears at the output with no change in sign. Hence the negative terminal is called the “inverting terminal” and the positive terminal the “non-inverting terminal.” In general the output voltage is directly proportional to the difference of the input voltage. The constant of proportionality, - A; is the voltage gain of the amplifier. (a) Symbol (b) Equivalent Circuit Characteristics The ideal op...