I am trying to understand what happens when 2 supplies or voltage signals are tied to together as I come across similar situations where a Totem-pole output is also being pulled-up by a weak pull-up. In these cases I am wondering if the signal would conflict and result in an unknown final voltage level. Also, wouldn't the voltage difference between the signals cause unwanted current to flow between them which could be undesirable?
The simulation result showed that the voltage across the load is 1.8v. On checking the current in the simulator, I observe that DC supply V1 provides the 0.18mA to the load, but DC supply V2 doesn't. I am wondering - how does the simulator decide which voltage sources provides the 0.18mA to the load (in this case V1 is providing 0.18mA and V2 is 0mA)? Also, shouldn't the current be provided equally by both supplies (V1 providing 0.09mA and V2 providing 0.09mA)?
Thanks for any help in developing a better understanding.