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Semiconductor Electronic: Material, Devices And Simple Circuits — Physics STD 12 Science — Question

Gujarat BoardEnglish MediumSTD 12 SciencePhysicsSemiconductor Electronic: Material, Devices And Simple Circuits5 Marks
Question
How would you set up a circuit to obtain NOT gate using a transistor?
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Answer

  1.  It has only one input and only one output.
  2. Boolean expression is Y = Ᾱ and is read as "y equals not A".Logical symbol of NOT gate.

  1. Realization of NOT gate: The transistor is so biased that the collector voltage VCC = V (Voltage corresponding to 1 state).

The resistors R and RB are so chosen that if the input is low, i.e. 0, the transistor is in the cut off and hence the voltage appearing at the output will be the same as applied V = 5V. Hence Y = V(or state I).

If the input is high, the transistor current is in saturation and the net voltage at the output Y is 0 (in state 0).

  1. Truth table for not gate: 
AY = Ᾱ
01
10

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