Oct 2013 Sharif University of Technology 1

Simple Half-rate phase detector detects but has no reference!

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 2

Half-rate linear phase detector detects plus producing a reference!

But do I believe it?

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 3

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 4

Frequency detector shows that slow and fast clocks can have a bang bang performance using three flip-flops.

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 5

CDR sample architecture 1. Frequency Detector and Phase Detector both used.

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 6

CDR Sample Architecture 2.FD plus PD! Coarse plus fine VCO Control

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 7

CDR Sample Architecture 3.Using two coupled VCO’s

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 8

CDR Sample Archtecture 4.Using External reference.

Optical Communications: Circuits, Systems and Devices

Oct 2013 Sharif University of Technology 9

Questions

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