Question
How would you set up a circuit to obtain NOT gate using a transistor?
✓
Answer
- It has only one input and only one output.
- Boolean expression is Y = Ᾱ and is read as "y equals not A".Logical symbol of NOT gate.
- Realization of NOT gate: The transistor is so biased that the collector voltage $V_{CC} = V$ (Voltage corresponding to 1 state).
If the input is high, the transistor current is in saturation and the net voltage at the output Y is 0 (in state 0).
- Truth table for not gate:
| A | Y = Ᾱ |
| 0 | 1 |
| 1 | 0 |
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