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What is an imaginary short?

Latest Updated:03/01/2006

Question:

What is an imaginary short?

Answer:

An imaginary short is the state where there is no difference between the positive input potential and the negative input potential when negative feedback is applied in an operational amplifier. It is called an imaginary short because the potential between the positive input and negative input is the same in terms of voltage, so it seems as if these pins are shorted.

<Example using inverting amplifier>



In the above diagram, the negative input and positive input have the same GND level. Ideally, the operational amplifier executes amplification operations using feedback characteristics that preserve this imaginary short state.
Suitable Products
Operational Amplifiers
USB2.0 Host/Peripheral Controller
M66596, R8A66597
UPD720150