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Analog ElectronicsDifferential Amplifiers

In an ideal BJT differential amplifier with perfectly matched transistors and equal collector resistors, applying the same signal to both inputs ideally produces a differential output of?

  • AZero
  • BEqual to twice the input
  • CInfinite
  • DEqual to the supply voltage
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Correct Answer: A. Zero
Explanation: An ideal differential amplifier rejects a signal common to both inputs, so the differential output due to a pure common-mode signal is zero.
Reference: Standard analog electronics: differential amplifiers
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