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Q#1
Logic Family
GATE EC 2002
MSQ
+2 marks
-0 marks
Each transistor in Figure has dc current gain 
, cut-in voltage 
and 
. The output voltage 
for 
in saturation can be as high as 0.2 V. Assume 0.7 V drop across a conducting p-n junction. Determine
(a) The minimum level 
necessary to keep saturation.
(b) The maximum permissible value for the resistance 
.
(c) The worst-case high input (logic 1) and the worst-case low input (logic 0) for which will be either in saturation or in cut off.
(a) 
(a) 
(b) 
(c) 
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