Embedded Systems Conference
Breaking News
Comments
_hm
User Rank
Author
Low value capacitor
_hm   3/5/2014 6:39:36 PM
NO RATINGS
If high speed differential has very low value capacitors to gnd, will it help prevent limited energy ESD damage?

 

Measurement.Blues
User Rank
Author
Re: Low value capacitor
Measurement.Blues   3/5/2014 9:05:22 PM
NO RATINGS
Any capacitance will slow the edges of the signal. If you can tolerate that, you may be OK.

millikans drop
User Rank
Author
Re: Low value capacitor
millikans drop   3/6/2014 1:06:15 PM
NO RATINGS
The problem with using capacitors as ESD protection elements is that to have any clamping effectiveness against the ESD pulse, you need a relatively high cap value... >10nF.  Of course, this high of cap will kill the link on higher speed ports (diff pairs).   The other issue is that unless the capacitor is physically large (0805 or larger), the capacitor itself could be damaged by the ESD.  

resistion
User Rank
Author
RC
resistion   3/6/2014 10:44:32 PM
NO RATINGS
Generally understood the capacitor to charge or discharge to steady state value, over a time scale of RC. So it effectively slows down the ESD pulse while also damping it and drawing the current. Also recall, no voltage discontinuities allowed on a capacitor.

x_acto
User Rank
Author
More than just hard failures
x_acto   3/13/2014 6:08:15 PM
NO RATINGS
Most PCB and System designers focus on trying to eliminate hard failures and often overlook user induced soft failures. 

Pulse simulator systems for product characterization and qualification techniques were never intended for use by the system design engineer as root-cause analysis and debug tools.

Instead a solution to this problem has adapted EMI/EMC 3D scanning systems in conjunction with injected pulse generator simulators in both "current reconstruction" and transient susceptibility scanning modes to attempt to identify which individual components and nodes actually "feel" the residual and induced transient pulses, how much, and to what effect.

A recent EDN article <http://edn.com/design/test-and-measurement/4427136/Embedded-scanning--The-next-step-in-ESD-detection> takes a look toward the future of ESD scanning/reconstruction technology, including Embedded ESD Scanning.

The author of the article, Jeff Dunnihoo of Pragma Design in Austin, Texas, specializes in interface design and ESD architecture analysis.

Jeff recently presented his EMI/EMC 3D scanning solution to the members and guests of the IEEE Boston Reliability Society and the North East Chapter of the ESD Association.



Top Comments of the Week
Flash Poll
Radio
LATEST ARCHIVED BROADCAST
EE Times Senior Technical Editor Martin Rowe will interview EMC engineer Kenneth Wyatt.
Like Us on Facebook

Datasheets.com Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
Special Video Section
After a four-year absence, Infineon returns to Mobile World ...
A laptop’s 65-watt adapter can be made 6 times smaller and ...
An industry network should have device and data security at ...
The LTC2975 is a four-channel PMBus Power System Manager ...
In this video, a new high speed CMOS output comparator ...
The LT8640 is a 42V, 5A synchronous step-down regulator ...
The LTC2000 high-speed DAC has low noise and excellent ...
How do you protect the load and ensure output continues to ...
General-purpose DACs have applications in instrumentation, ...
Linear Technology demonstrates its latest measurement ...
10:29
Demos from Maxim Integrated at Electronica 2014 show ...
Bosch CEO Stefan Finkbeiner shows off latest combo and ...
STMicroelectronics demoed this simple gesture control ...
Keysight shows you what signals lurk in real-time at 510MHz ...
TE Connectivity's clear-plastic, full-size model car shows ...
Why culture makes Linear Tech a winner.
Recently formed Architects of Modern Power consortium ...
Specially modified Corvette C7 Stingray responds to ex Indy ...
Avago’s ACPL-K30T is the first solid-state driver qualified ...
NXP launches its line of multi-gate, multifunction, ...