In VCO the output frequency is a linear function of its input : 

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  1. Frequency 
  2. Voltage 
  3. Time period
  4. None of the option

Answer (Detailed Solution Below)

Option 2 : Voltage 
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The correct answer is Voltage.

key-point-image Key Points

  • A Voltage-Controlled Oscillator (VCO) is an electronic oscillator whose oscillation frequency is controlled by a voltage input.
    • The output frequency of a VCO is directly proportional to the input voltage, meaning that as the input voltage changes, the output frequency changes linearly.
    • VCOs are widely used in communication systems, function generators, and phase-locked loops (PLLs).
    • The input voltage is typically applied to a varactor diode or a voltage-controlled capacitor, which adjusts the frequency of the oscillator circuit.
    • VCOs can generate a wide range of frequencies, making them versatile in various applications.

additional-information-image Additional Information

  • VCOs can be designed using different technologies, including analog and digital circuits.
  • In analog VCOs, the frequency is usually adjusted by changing the capacitance or inductance in the circuit.
  • Digital VCOs use digital-to-analog converters (DACs) to convert a digital input into a corresponding voltage that controls the frequency.
  • VCOs are critical components in frequency modulation (FM) and phase modulation (PM) systems.
  • Modern VCOs offer high-frequency stability and low phase noise, which are essential for high-performance communication systems.
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