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Phase Locked Loop Design

Phase Locked Loop Design. Matt Knoll Engineering 315. Introduction. What is a PLL? Control System Representation Parts of a PLL PLL in Simulink. What is a PLL?. Digital frequency control system Generate high speed oscillations Acquire and track signals Radio Frequency Demodulation

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Phase Locked Loop Design

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  1. Phase Locked Loop Design Matt Knoll Engineering 315

  2. Introduction • What is a PLL? • Control System Representation • Parts of a PLL • PLL in Simulink

  3. What is a PLL? • Digital frequency control system • Generate high speed oscillations • Acquire and track signals • Radio Frequency Demodulation • DX-ing • RF communications

  4. Control system representation

  5. Modeling a PLL

  6. PLL Control System

  7. Parts of a PLL • Phase Detector • Filter • Voltage Controlled Oscillator • Programmable Counter

  8. Parts of a PLL • Phase Detector • Acts as comparitor • Produces a voltage proportional to the phase difference between input and output signal • Voltage becomes a control signal

  9. Parts of a PLL • Filter • Determines dynamic characteristics of PLL • Specify Capture Range (bandwidth) • Specify Tracking Range • Receives signal from Phase Detector and filters accordingly

  10. Parts of a PLL • Voltage Controlled Oscillator • Set tuning range • Set noise margin • Creates low noise clock oscillation

  11. Parts of a PLL • Divider • Divides the VCO output by the degree of the open loop gain • Feedback loop allows phase comparison

  12. PLL in Simulink

  13. Questions?

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