Phase Locked Loop Design

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

Control system representation

Modeling a PLL

PLL Control System

Parts of a PLL

Phase Detector
Filter
Voltage Controlled Oscillator
Programmable Counter

Parts of a PLL

Phase Detector
Acts as comparitor
Produces a voltage proportional to

Parts of a PLL

Filter
Determines dynamic characteristics of PLL
Specify Capture Range (bandwidth)
Specify

Parts of a PLL

Voltage Controlled Oscillator
Set tuning range
Set noise margin
Creates low

Parts of a PLL

Divider
Divides the VCO output by the degree of

PLL in Simulink