It is not as simple as that (it never is).Do bias current of opamp flow into inverting & non-inverting terminal? how to determine in which direction current will flow.
And that's not entirely true either. Some bipolar op amps have compensation bias circuits at the input (not always shown on the data sheet schematic) in an attempt to cancel the input bias current. This compensation is never perfect and sometimes the left-over uncompensated current goes out of the input terminal and sometimes it goes into the terminal. There's no way to predict.Disagreeing with studiot, agreeing with Audioguru,
By looking at the internal construction of a bipolar input op-amp, you can determine the direction of current flow. Often enough, it is significantly large to require you to account for it in your design. This type of op-amp is not, "Ideal"..............
If the opamp uses PNP devices, the bias current flows out of the inputs. If it is NPN devices, flows in. If it's FET input, current doesn't flow in or out.Do bias current of opamp flow into inverting & non-inverting terminal? how to determine in which direction current will flow.
For Jfet, the bias current is actually leakage current and if measurable is in the order of 1nA or lessIf the opamp uses PNP devices, the bias current flows out of the inputs. If it is NPN devices, flows in. If it's FET input, current doesn't flow in or out.
by Jake Hertz
by Jake Hertz
by Jake Hertz
by Jake Hertz