OpAmp from MOSFETs? It's harder than what you think!

[@fatiheneskuru4332]

Nice vid ! While trying to compehend how it operates, one thing boggled my mind, how does it compare the input voltages ? is it because saturation of one transistor namely the inverting input transistor raises the voltage at emitters of both input transistors node and therefore raising the thresold voltage of the other transistor. Presuming that's the case can we say that in this configuration with bjt's the input offset is 700mV ?

[@martin_racz_a_szerelo]

I don't know what are you trying to say. I did learned a bit about the working principle of the OpAmp, that's why I went with that design. I know, there should be a current mirror with a constant current drive, but I don't have enough knowledge to design one. Not talking about to do it with CMOS tech, of course. Away from the topic, you can also check out my little paint program in Snap! : snap.berkeley.edu/project?username=martinracz&projectname=Paint%20Program%20%282023%29%20by%20Martin%20R%c3%a1cz