I've recently come across a topic that has not been covered in my studies (or at least not as yet). It's positive feedback of an amplifier.
I have been reading this link on positive feedback. From what I've read, positive feedback appears to work as a bistable device. For the output to change from one state to the opposite, the same state needs to be applied at the inverting input, but at a slightly greater magnitude. Which means we would need AC voltage on the inputs to effectively see this. This is the application of how hysteresis works.
I've noticed that the output voltage is saturated by a value that is close to the supply voltage:
Is this as a result of the input being amplified, or is the saturation happening due to the supply voltage?