1. Phase Locked Loop Design Presentation ECE 442 Lab April 27, 2010 Ari Mahpour

2. Phase Locked Loop Usage of a Voltage Controlled Oscillator – Creating an oscillating waveform and finds an offset between it and the target frequency – Loops until locks on with target frequency, thus creating a identical copy of it

3. Phase Locked Loop Voltage Controlled Oscillator - Diagram

4. Phase Locked Loop Voltage Controlled Oscillator - Simulation

5. Phase Locked Loop Phase Locked Loop Block Diagram

6. Phase Locked Loop Application of a Phase Locked Loop – Clock Synchronizer Checks whether clocks on a circuit are all synchronous with each other

7. Phase Locked Loop Where is this needed? – All memories constantly being read and written to need to work on the same clock i.e. Can not be out of phase with each other