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.Is virtual ground concept a property that arises due to internal structure of operational amplifiers or due to circuit configuration?
by Duane Benson
by Aaron Carman
by Duane Benson