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Analog ElectronicsOscillators & PLL

A voltage-controlled oscillator (VCO) is an oscillator whose output frequency is primarily controlled by?

  • AAn applied control voltage
  • BOnly ambient temperature
  • CThe load resistance alone
  • DA fixed diode current with no control input
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Correct Answer: A. An applied control voltage
Explanation: A VCO converts a control voltage into a corresponding change in oscillation frequency and is widely used in modulation and PLL systems.
Reference: Standard analog electronics: voltage-controlled oscillator
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