HDMI接口的ESD保护技术(不牺牲性能)

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HDMI ESD Protection Without Sacrificing Performance
Adding ESD Protection to HDMI, Even at 3.4GHz, Just Became Easier

ABSTRACT
The newest high-definition multimedia interface (HDMI) 1.3
standard doubles the previous HDMI 1.0 - 1.2 data rate to 3.4Gbps
per differential signal pair. This increased data rate introduces
new challenges in implementing a solid board design with low
capacitance that ensures adequate signal integrity. This is
particularly important when executing a robust electrostatic
discharge (ESD) protection solution. Adding ESD protection to
your HDMI system design can be simplified by choosing the
proper solution. Tyco Electronics’ ESD and overcurrent
protection reference layout complies with the HDMI 1.3
specification at 3.4GHz, helps meet the requirements of the IEC
61000-4-2 ESD protection specification, and optimizes board
space, all of which helps minimize risk for designers. This paper
explores the requirements and pitfalls of designing ESD
protection into HDMI 1.3 systems.
OVERVIEW
Adding ESD protection to high-definition video systems raises
many complex and confusing issues that can increase costs and
time-to-market. Often choices are made based on what looks like
an easy solution to implement; however, the simplest approach
may not provide adequate ESD protection performance or
optimal board footprint. In other cases, what seems like the best
ESD protection solution at first is later found to require multiple
board spins to ensure that adequate timing is met. Providing
adequate protection has usually meant making tradeoffs
between size, ESD protection performance, and ease of
implementation. Until now.
The purpose of this paper is to discuss the principal cause of
complexity in implementing robust ESD protection for HDMI 1.3
systems – operation speed – and the design criteria that must be
considered to provide adequate protection.

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