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In: Electrical Engineering

Explain how the BJTs are used as switches to implement the NAND and NOR gates respectively.

Explain how the BJTs are used as switches to implement the NAND and NOR gates respectively.

Solutions

Expert Solution

BJT:

bipolar junction transistor

they can operate in reverse, saturation and active modes depending upon the biasing used

BJT can acts as a switch when the biasing is such that any form on input present at the base can lead to the conduction of current from emitter to collector. In this situation, the BJT will work as a switch.

as we know that Nand gate truth table the output is 0 when both the inputs are 1.

hence the two BJT will be series hence the collector of 1 will be connected to emitter and inputs will be given to the base o the two transistors. as shown the output is taken right after the supply to the first BJT since the output is always 1 until both the transistors are ON.

similarly with nor gates.

the output is 0 even if any 1 of transistors is on hence the transistors should be parallel. the output is taken near the vcc .

as shown:

Manojponduru answered 3 weeks ago
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