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Return Loss in Professional Video Systems

Event Type: 
Section Meeting
Event Date: 
Wednesday, November 17, 2010 - 19:00
AJA Video Systems
180 Litton Drive
95945 Grass Valley, CA
United States
Event Details: 

Mark Sauerwald, Applications Engineer
National Semiconductor

What is Return Loss? Overview of the definition of return loss

What are the SMPTE Return Loss specifications? Specs for the various SMPTE SDI interfaces

How is Return Loss Measured? Overview of the two primary instruments used for measuring return loss (VNA and TDR), and a demonstration of the use of each. Discussion of how measurement technique is different for different types of ports, input vs output, Serializer vs DA or other types of instruments.

How do I design my system to get good return loss? Discussion of controlled impedance PCB layout. Layout tips and techniques. Return Loss Compensation Networks

Shifting the burden: Isolating components which are known to cause return loss issues from the input/output port. Using components with built in return loss compensation networks.

Play time: We will look at a variety of different boards on the network analyzer and see how different design decisions impact the return loss performance..

Mark Sauerwald has been involved in semiconductor components for digital video – first at TRW LSI products, working on A/D converters for digital video, then at Comlinear, later acquired by National Semiconductor for 28 years.  Mark spent a few years working for Gennum Corporation before returning to National Semiconductor where he now works as an Applications Engineer with the Interface Products Group.  When not working, Mark is an avid cyclist, and a serious amateur photographer.

Mark Sauerwald graduated from the University of California at San Diego in 1982 with a bachelor’s degree in electrical engineering.