An amplifier is a circuit which can produce an output voltage, which is the product of input voltage with a value called voltage gain. An op-amp (operational amplifier) is a kind of amplifier circuit which can perform an operation (addition, subtraction etc.) on the input voltages, apart from simply amplifying the input. An op-amp (operational amplifier) is an electronic circuit made of several active devices (transistors) and passive devices (resistor, capacitors) etc. which is capable of realizing following the common features:The term op-amp first appeared in a patent produced by Karl D. Swartzel of Bell Labs in 1941. This amplifier was capable of doing a summing operation on the input voltages.
Suggested Reading:-
Operational Amplifiers Tutorials Series�
Linear Op-amp Operation-Inverting And Non-Inverting Configuration
Voltage Follower and Difference Amplifier Configuration
Instrumentation and Summation Configuration
Op-amp with T-bridge Feedback Network
Op-amp Integrator Network
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