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Analog ElectronicsOscillators & PLL

In a phase-locked loop, the phase detector produces a signal related to?

  • AThe phase difference between reference and feedback signals
  • BOnly the output amplitude
  • CThe transistor collector current only
  • DThe power-supply voltage
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Correct Answer: A. The phase difference between reference and feedback signals
Explanation: The phase detector compares reference and feedback phases; after loop filtering, its error signal controls the VCO to establish lock.
Reference: Standard analog electronics: phase-locked loop
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