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If A and B are the logical inputs to the following circuit, determine the logical relation between the inputs and the output X.
  • a)
    X = AB
  • b)
  • c)
  • d)
    X = A + B
Correct answer is option 'A'. Can you explain this answer?
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Most Upvoted Answer
If A and B are the logical inputs to the following circuit, determine ...
Concept:
  • In a Common Emitter transistor, if input A is at low potential (Logic0) than, there is no voltage drop across Base Emitter junction and hence no current will flow through the Transistor (Cut Off state). therefore output is at high potential (Logic1).
  • In a Common Emitter transistor, if input A is at high potential (Logic1) than, there will be a voltage drop across Base Emitter junction and hence current will flow through the Transistor (Saturation state). therefore output is at low potential (Logic0).
Application:
⇒ It can be NOT or NAND (because the output is inversion of input in these two cases)
⇒ NAND Gate (output is inversion of product of both the inputs)

Now,


∴ Output, X = A⋅B
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Community Answer
If A and B are the logical inputs to the following circuit, determine ...
Concept:
  • In a Common Emitter transistor, if input A is at low potential (Logic0) than, there is no voltage drop across Base Emitter junction and hence no current will flow through the Transistor (Cut Off state). therefore output is at high potential (Logic1).
  • In a Common Emitter transistor, if input A is at high potential (Logic1) than, there will be a voltage drop across Base Emitter junction and hence current will flow through the Transistor (Saturation state). therefore output is at low potential (Logic0).
Application:
⇒ It can be NOT or NAND (because the output is inversion of input in these two cases)
⇒ NAND Gate (output is inversion of product of both the inputs)

Now,


∴ Output, X = A⋅B
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If A and B are the logical inputs to the following circuit, determine the logical relation between the inputs and the output X.a)X = ABb)c)d)X = A + BCorrect answer is option 'A'. Can you explain this answer?
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