The PLL device is:

The PLL device is: Correct Answer Feedback system that compares output phase and input phase

The PLL device is a feedback system that compares output phase and input phase.

Related Questions

If high pass filter is used instead of Low pass filter in the PLL the response of PLL would be:
What expansion types do most pll/plll motherboards support?
When a PLL is being used as a frequency synthesizer, the output is taken from