What is Phase Lock Loop (PLL)? How Phase Lock Loop Works ? PLL Explained

In this video, the basics of the Phase Lock Loop (PLL) have been explained. By watching this video, you will learn the following topics: 0:00 Introduction 0:20 Applications of Phase Lock Loop 1:24 How Phase Lock Loop Works 3:30 Capture Range and Lock Range of PLL 5:11 How Phase detector works? XOR Gate as Phase Detector 9:30 Phase Frequency Detector 13:41 PLL as Frequency Synthesizer What is Phase Lock Loop : The Phase Lock Loop is the control loop or the control system which maintains the same phase between the input or the reference signal and the output signal. The Phase Lock Loop consist of three basic blocks: 1) Phase Detector 2) Loop Filter (Low Pass Filter) 3) Voltage Controlled Oscillator (VCO) Working of PLL: Phase Detector : The Phase detector detects the phase difference between the VCO and the input, or the reference signal. Based on the phase difference, it generates the error signal. At RF frequencies, the balanced mixer is used as a phase detector, while for the digital signal, the XOR gate and Phase Frequency Detector is used for the phase detection. Low Pass Filter: The low pass filter removes the high-frequency components from the error signal and generates the error voltage. The error voltage is fed to the VCO for the frequency correction. Voltage Controlled Oscillator: Based on the Control Voltage, the output frequency of the VCO can be controlled around the center frequency. Based on the error voltage, the output frequency of the VCO...