> Depending on the voltage across a resistor like that, you may calculate less than one electron passing through the resisitor per second. If memory serves (th

> Depending on the voltage across a resistor like that, you may calculate less than one electron passing through the resisitor per second. If memory serves (this was a very long time ago) the output signal was a couple of millivolts, so it wasn't quite that bad. But one other thing that saved us was that we only needed a few hertz of bandwidth.