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MCQ Practice Question
Analog ElectronicsCurrent Mirrors

In a basic BJT current mirror, finite transistor beta causes the output current to differ from the ideal reference mainly because?

  • AThe reference branch must also supply base currents
  • BCollector resistors become inductors
  • CThe Early voltage becomes zero
  • DBoth transistors enter breakdown automatically
Report an error
Correct Answer: A. The reference branch must also supply base currents
Explanation: The reference current supplies the diode-connected transistor collector current plus the base currents of the mirror transistors, producing finite-beta error.
Reference: Standard analog electronics: current-mirror error
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