Where do input bias currents flow?
This is my answer to SE EE question AC coupled differential op amp bias current return path . My answer The best way to understand and explain circuits in an intuitive way is to show where currents flow and what voltages are in circuits and inside resistors . Here the OP is interested in where the input bias currents flow. That is why I have shown in Fig. 1 only their paths on a simplified conceptual circuit diagram of a part of an internal op-amp structure. Fig. 1. A conceptual op-amp circuit diagram with input bias currents visualized. It can be supplemented with (thicker) loops representing the collector currents flowing in the input and output stage - Fig. 2. Fig. 2. A conceptual op-amp circuit diagram with all currents visualized. It is interesting to see that the input bias current I- entering the inverting op-amp input is provided by both the positive power supply V+ and negative V- (connected in series) while the input bias current I+ entering the non-inverting inpu...