LIC-PLL

What is the primary function of a phase-locked loop?

• A. Signal amplification
• B. Frequency modulation
• C. Phase detection
• D. Amplitude modulation

What is the output frequency of a phase-locked loop equal to?

• A. The input frequency
• B. The VCO frequency
• C. The sum of the input and VCO frequencies
• D. The difference between the input and VCO frequencies

What is the role of the phase detector in a phase-locked loop?

• A. To amplify the input signal
• B. To compare the input and VCO signals
• C. To generate the output signal
• D. To filter the input signal

What is the role of the low-pass filter in a phase-locked loop?

• A. To amplify the input signal
• B. To compare the input and VCO signals
• C. To generate the output signal
• D. To filter the VCO signal

What is the purpose of the voltage-controlled oscillator in a phase-locked loop?

• A. To amplify the input signal
• B. To compare the input and VCO signals
• C. To generate the output signal
• D. To provide a frequency reference

What happens to the phase error signal when the input frequency is higher than the VCO frequency?

• A. The phase error signal increases
• B. The phase error signal decreases
• C. The phase error signal remains constant
• D. The phase error signal oscillates

What happens to the output frequency of a phase-locked loop if the input frequency increases?

• A. The output frequency increases
• B. The output frequency decreases
• C. The output frequency remains constant
• D. The output frequency becomes unstable

What is the function of the loop filter in a phase-locked loop?

• A. To filter out noise
• B. To amplify the input signal
• C. To provide feedback
• D. To control the gain of the phase detector

What is the effect of increasing the loop gain of a phase-locked loop?

• A. The stability of the loop decreases
• B. The bandwidth of the loop decreases
• C. The phase noise of the loop decreases
• D. The settling time of the loop decreases

What is the advantage of using a phase-locked loop in a communication system?

• A. Increased bandwidth
• B. Improved signal-to-noise ratio
• C. Greater frequency stability
• D. Reduced phase noise