What is Virtual short?
The property of an ideal op-amp with negative feedback that its two input voltages become nearly equal. Although no current flows between them, they can be treated as shorted, which makes gain calculations simple.
Virtual short in the explanations
From these assumptions, a negative-feedback circuit keeps both inputs at the same voltage—the "virtual short"—so circuit gain depends only on resistor ratios.
Which combination correctly describes an ideal op-amp?The inputs look shorted without being connected, hence "virtual short"; with the non-inverting input grounded, the inverting input sits at 0 V (virtual ground).
In an ideal op-amp circuit with negative feedback, what is …
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Related terms
Operational amplifier (op-amp) Negative feedback 1/f noise (flicker noise) Bandgap voltage reference CMRR (common-mode rejection ratio) Comparator Cutoff frequency Differential amplifier Gain-bandwidth product (GBW) Instrumentation amplifier