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A signal that is applied with equal strength to both inputs of a differential amplifier or an operational amplifier
  • a)
    common mode signal
  • b)
    common emitter circuit
  • c)
    common ratio signal
  • d)
    none of the above
Correct answer is option 'A'. Can you explain this answer?
Most Upvoted Answer
A signal that is applied with equal strength to both inputs of a diffe...
Concept:
Common mode signal:
  • A common-mode signal is one that drives both inputs of a differential amplifier equally
  • The common-mode signal is interference, static and other kinds of undesirable pickup etc
Application:
  • The transistors in the differential amplifier are chosen to be closely matched
  • If both the transistors were matched in all respects then the balanced output would be theoretically zero
  • This is the important characteristic of a differential amplifier
  • It discriminates against common-mode input signals i.e. it refuses to amplify the common-mode signals
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A signal that is applied with equal strength to both inputs of a differential amplifier or an operational amplifiera)common mode signalb)common emitter circuitc)common ratio signald)none of the aboveCorrect answer is option 'A'. Can you explain this answer?
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