Solution to problem 1

(i) The circuit shown is a two - input NAND gate.

(ii) The critical voltages for the circuit are :

VIL = 1.4V

VIH = 1.7V

VOH = 4.3V

VOL = 0.5V

 

(iii) The VTC for the circuit :

(iv) The knee region does not exist as the circuit has an active

discharge path for output transistor.