modified 9 years ago

Virtual short in OPAMP

00:33:00

Equivalent circuit is shown at right side. 
The green resistor is input impedance of opamp. 

----- Virtual short --------
Ideally the voltage across input impedance is zero. ie. Voltage difference  between two  input terminals  is zero. 
ie Vd=0 
ie V1-V2=0 
ie  V1 = V2 
This is possible only if the two terminals are actually shorted. As they are not, they are said to be "virtually shorted".

----- Virtual ground -----
Now if one of the terminal is actually grounded. Then the other terminal appears to be grounded. This is referred as "virtual ground".


Keep circuiting. Take care. ☺

published 9 years ago

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