Question

can any one tell me the detailed explanation of virtual gnd in op amp..?

Answer 1

Virtual Gnd as explained in "fundamentals of Microelectronics" by Razavi is that the point is at 0 potential ( rather same as that of the voltage on ther terminal of opamp) but it does not possess properties of a normal ground connection (remember ground also acts as a sink for current in the circuit).

Answer 2

study ideal op amp

Answer 3

which 1 is the best book for op amp...?

Answer 4

hey I'm Tolu from Nigeria, can any1 explain d mosfet amplier

Answer 5

Virtual ground means,the position where we assumed that it is zero potential even though there have a voltage that is negligible.

Answer 6

but what is exact reason for it...?
is dat the closed loop config of op amp or infinite input impedance of th op amp..?

Answer 7

Due to the negative feedback the op-amp tries to put both its inputs at the same voltage; so if one of them is tied to the real ground, the other is quite at the same voltage (0V) but it can't sink current, because of the great internal resistance of the op-amp. That's the reason we call it "virtual" ground: you use it as a 0 voltage reference point.