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
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