Phase locked loop design
- 1. Phase Locked LoopPhase Locked Loop DesignDesign T.Kalavathi DeviT.Kalavathi Devi ASPASP EIEEIE Kongu Engineering CollegeKongu Engineering College
- 2. IntroductionIntroduction What is a PLL?What is a PLL? Control System RepresentationControl System Representation Parts of a PLLParts of a PLL PLL in SimulinkPLL in Simulink
- 3. What is a PLL?What is a PLL? Digital frequency control systemDigital frequency control system Generate high speed oscillationsGenerate high speed oscillations Acquire and track signalsAcquire and track signals • Radio Frequency DemodulationRadio Frequency Demodulation • DX-ingDX-ing • RF communicationsRF communications
- 4. Control system representationControl system representation
- 5. Modeling a PLLModeling a PLL
- 6. PLL Control SystemPLL Control System
- 7. Parts of a PLLParts of a PLL Phase DetectorPhase Detector FilterFilter Voltage Controlled OscillatorVoltage Controlled Oscillator Programmable CounterProgrammable Counter
- 8. Parts of a PLLParts of a PLL Phase DetectorPhase Detector Acts as comparitorActs as comparitor Produces a voltage proportional to the phaseProduces a voltage proportional to the phase difference between input and output signaldifference between input and output signal Voltage becomes a control signalVoltage becomes a control signal
- 9. Parts of a PLLParts of a PLL FilterFilter Determines dynamic characteristics of PLLDetermines dynamic characteristics of PLL Specify Capture Range (bandwidth)Specify Capture Range (bandwidth) Specify Tracking RangeSpecify Tracking Range Receives signal from Phase Detector and filtersReceives signal from Phase Detector and filters accordinglyaccordingly
- 10. Parts of a PLLParts of a PLL Voltage Controlled OscillatorVoltage Controlled Oscillator Set tuning rangeSet tuning range Set noise marginSet noise margin Creates low noise clock oscillationCreates low noise clock oscillation
- 11. Parts of a PLLParts of a PLL DividerDivider Divides the VCO output by the degree of the openDivides the VCO output by the degree of the open loop gainloop gain Feedback loop allows phase comparisonFeedback loop allows phase comparison
- 12. PLL in SimulinkPLL in Simulink