In phase locked loop, the primary role of the voltage controlled oscillator is _______________.

Explanation:

A Phase Locked Loop (PLL) is an electronic circuit that synchronizes an output signal's phase and frequency with a reference signal. It is widely used in communication systems, signal processing, and control systems for applications such as frequency synthesis, demodulation, and clock recovery.e.

Working Principle of VCO in a PLL:

• The VCO generates an output signal whose frequency is determined by the DC control voltage applied to it.
• The output signal from the VCO is compared with the input reference signal in the phase detector of the PLL.
• The phase detector produces an error signal proportional to the phase difference between the reference signal and the VCO output.
• This error signal is filtered by the loop filter and applied to the VCO as a control voltage.
• The control voltage adjusts the frequency of the VCO output to minimize the phase difference, achieving phase synchronization between the input reference signal and the VCO output.

Role of VCO in PLL:

The primary role of the Voltage Controlled Oscillator in a Phase Locked Loop is to generate a frequency that is proportional to the DC input voltage. This frequency is adjusted based on the feedback provided by the phase detector and loop filter to synchronize with the reference signal. This role ensures that the PLL can lock onto and track the desired frequency and phase accurately.

Correct Option Analysis:

The correct option is:

Option 2: To generate a frequency which is proportional to the DC input voltage.

This option accurately describes the primary role of the Voltage Controlled Oscillator in a Phase Locked Loop. The VCO generates an output signal whose frequency is directly proportional to the applied DC input voltage. This frequency is adjusted dynamically during the PLL operation to achieve synchronization with the reference signal.