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Analog ElectronicsDifferential Amplifiers

For a long-tailed differential pair, increasing the small-signal resistance of the tail-current source primarily reduces?

  • ACommon-mode gain
  • BDifferential input resistance to zero
  • CDifferential gain to zero
  • DSupply voltage
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Correct Answer: A. Common-mode gain
Explanation: A high tail resistance makes total current less sensitive to common-mode voltage changes, reducing common-mode gain and improving CMRR.
Reference: Standard analog electronics: common-mode rejection
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