Is virtual ground concept a property that arises due to internal structure of operational amplifiers or due to circuit configuration?

 

It is usually used when you want to use only one power supply to power an amplifier. You create a virtual ground at 1/2 the supply voltage so the signal can swing above at below it.

 

Virtual ground is equivalent to biasing, as in biasing a signal to be centered in the linear region of an amplifier.

 

Is virtual ground concept a property that arises due to internal structure of operational amplifiers or due to circuit configuration?

Another definition of a virtual ground, in addition to that previously discussed, is the summing junction of an op amp configured as an inverter with the (+) input grounded. In that configuration the (-) input will stay very close to ground potential due to the negative feedback as determined by the high open-loop gain of the op amp and its input offset (as long as the op amp output is not saturated). Since the (-) input stays very close to ground potential, even though it is not connected to ground, it is referred to as a virtual ground point.

I prefer the term pseudo-ground for a reference point at 1/2 the supply voltage to differentiate it from the op amp input virtual ground but that is not a commonly used designation.

So, in answer to your question, this type of virtual ground is a property of the op amp circuit configuration.

 

thanks so much