Advanced Member level 4
Give you only three voltage A, B, and C, no other voltage available. That means you don't know which one can be used as supply voltage for decision circuit. The other difficult part is that at certain time A could be the smallest voltage, while at other time B or C could be smallest voltage. Design a circuit to find the smallest voltage among these three and output it using a CMOS tri-well process. Be careful of parasitic diode or SCR when you design this circuit. How to do that?