Design Con 2015
Breaking News
Newest First | Oldest First | Threaded View
Guru of Grounding
User Rank
re: Electrical noise and mitigation - Part 2: Ground loops, noise transmission and shielding
Guru of Grounding   9/3/2010 7:13:18 PM
What I was told by Belden (and it makes perfect sense) is that different color wires must have insulation applied by different extruders (where liquid PVC coats bare wire pulled through a small die). The tolerances on the die, and therefore, insulation thickness can vary by .001". Using 8451 as an example, this makes capacitance change by about 5%. However, by grounding a (balanced interface) cable shield only at the source end, most of the CMRR-degrading effects of the capacitance imbalance disappear. My generic seminar (see explains in detail.

Guru of Grounding
User Rank
re: Electrical noise and mitigation - Part 2: Ground loops, noise transmission and shielding
Guru of Grounding   9/3/2010 5:21:56 AM
I fail to see how the circuit in Figure 8.19 is "balanced". When one of the signal lines is grounded, the interface is unbalanced by definition. Also, anyone who believes that two conductors in a shielded cable have equal capacitance to the shield is a fool! If the wires are different colors (no joke), their capacitances can easily differ by 5% or more. I've measured this myself on many commercial cables (try Belden 8451, for example). Bill Whitlock, president & chief engineer of Jensen Transformers and Fellow of the Audio Engineering Society

User Rank
re: Electrical noise and mitigation - Part 2: Ground loops, noise transmission and shielding
chcuk   12/24/2008 2:50:11 AM
It is very good and comprehensive. But it seems to me that we need have a different approach for electrostatic or magnetic problem. Sometimes they are even against each other. The point is what is the scenario of which, electrostatic or magnetic play more dominant role.

Top Comments of the Week
Flash Poll
Like Us on Facebook Parts Search

185 million searchable parts
(please enter a part number or hit search to begin)
EE Life
Frankenstein's Fix, Teardowns, Sideshows, Design Contests, Reader Content & More
Max Maxfield

Is Your System Cyber-Secure?
Max Maxfield
Until recently, I was under the impression that my computer system in general -- and my precious data in particular -- was reasonably secure against the forces of evil, but then my eyes ...

Rich Quinnell

Bloopers Book Helps Improve GUI Development
Rich Quinnell
Courtesy of fellow editor "Max" Maxfield (aka Max the Magnificent), I recently acquired a copy of GUI Bloopers 2.0 by Jeff Johnson of UI Wizards. I found it an interesting read chock full ...

Martin Rowe

Make This Engineering Museum a Reality
Martin Rowe
Post a comment
Vincent Valentine is a man on a mission. He wants to make the first house to ever have a telephone into a telephone museum. Without help, it may not happen.

Rich Quinnell

Making the Grade in Industrial Design
Rich Quinnell
As every developer knows, there are the paper specifications for a product design, and then there are the real requirements. The paper specs are dry, bland, and rigidly numeric, making ...

Special Video Section
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 ...
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, ...
Doug Bailey, VP of marketing at Power Integrations, gives a ...
See how to ease software bring-up with DesignWare IP ...
DesignWare IP Prototyping Kits enable fast software ...
This video explores the LT3086, a new member of our LDO+ ...
In today’s modern electronic systems, the need for power ...