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 changes until the VCO frequency is equal to the input frequency.
Lock condition:
When the VCO frequency is the same as the input frequency and there is no phase difference or the constant phase difference between the two signals then the loop is said to be in the lock condition.
Capture Range of PLL :
Capture range is the range of input frequencies around the VCO center frequency onto which the loop can lock when starting from the unlocked condition.
Lock Range of PLL :
It is the range of input frequencies over which the loop remains in the lock condition once it has captured the input signal.
Applications of PLL :
1) Frequency Synthesizers and tone generation
2) System Clock generation and for Clock distribution in processors
3) For Synchronization and demodulation in the communication system
4) Jitter and Noise reduction
5) Clock Recovery
In this video, the different building blocks of the PLL and the basic working of the loop is explained.
The link of the other useful videos:
1) Voltage Controlled Oscillator
• Voltage Controlled Osc...
2) Low Pass Filter
• RC Low Pass Filter Exp...
This video will be helpful to everyone in understanding what is Phase Lock Loop and how it works?
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