day4_amShort Course On Phase-Locked Loops and Their Applications Day 4, AM Lecture Digital Frequency Synthesizers Michael Perrott August 14, 2008 Copyright 2008 by Michael H. Perrott All rights reserved. Why Are Digital Phase-Locked Loops Interesting? PLLs are needed for a wide range of applications - Communication systems (both wireless and wireline) - Digital processors (to achieve GHz clocks) - Phase noise can limit wireless transceiver performance - Jitter can be a problem for digital processors - Analog building blocks on a mostly digital chip pose design and verification challenges - The cost of implementation is becoming too high … Can digital phase-locked loops offer excellent performance with a lower cost of implementation? Performance is important The standard analog PLL impl……