virtual ground

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Discussion in 'General Electronics Chat' started by dileepchacko, Aug 7, 2008.

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Aug 7, 2008 #1

dileepchacko Thread Starter Active Member

May 13, 2008

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1

Hi All

What is the exact meaning of the virtual ground of an op-amp, why we are calling as virtual ground. Is the point is directly connected or internally connected.

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Aug 7, 2008 #2

studiot AAC Fanatic!

Nov 9, 2007

5,005

515

The answers to your question can be found here

http://www.allaboutcircuits.com/vol_3/chpt_8/5.html

Note in particular the virtual ground only applies to the inverting input of an amplifier, and that it is not directly connected to ground, either internally or externally.

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Aug 7, 2008 #3

Wendy Moderator

Mar 24, 2008

20,874

2,654

It is not directly connected, but if you were to measure it with a meter it appears to be ground, hence the name. The op amp does an excellent job of making that point "appear" to be ground, even to instrumentation.

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