Thursday 14 February 2019

Differential amplifier and op-amp


What are the differences between a differential amplifier and an op-amp? Both have two inputs. How do they differ from each other?



Answer




A differential amplifier traditionally has differential outputs: -


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Opamps almost without exclusion have a single output. However, over the years the distinction has become a bit cloudy. For instance, this is also called a differential amplifier: -


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Basically it's an op-amp with a differential input configuration.


Then there is the difference amplifier that I would say is the more correct way to describe the op-amp circuit above. There is also the Instrumentation amplifier (really just a difference amplifier): -


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