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Electronic Devices & CircuitsDifferential Amplifiers

In a differential amplifier, using a high-output-resistance tail current source generally improves?

  • ACommon-mode rejection
  • BRectifier efficiency
  • CDiode reverse recovery
  • DLED optical power only
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Correct Answer: A. Common-mode rejection
Explanation: A high-resistance tail source makes the total tail current less sensitive to common-mode input changes, thereby improving CMRR.
Reference: Standard analog electronics: differential pair tail source
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