This website uses cookies
We use cookies or simmilar technologies to ensure you get the best experience on our website. By continuing to browse this website you consent to the use of such technologies. For more information visit our Privacy Policy.
| FORUM

FEDEVEL
Platform forum

USE DISCOUNT CODE
EXPERT30
TO SAVE $30 USD

3h rule

shahabjafari372@gmail.com , 07-26-2022, 05:13 AM
hello every one . in my stackup the h1(distance between signal layer and upper ground) is 3.2 mil and h2(distance between signal layer and downer ground) is 4.2 . if i want to use 3h rule for minimize crosstalk i should use 3h1 or 3h2?
binayak , 07-28-2022, 12:15 AM
Your stripline configuration is more or less symmetric. Both planes will act as return planes. Normally you would take the lesser among h1 and h2.

How wide are your traces ? Normally for 50 ohm configuration:

(a) if edge to edge spacing (s) = trace width (w), we call it tightly coupled
(b) if s = 2w, we call it loosely coupled
(c) if s = 3w or more, we call it uncoupled

PS. Look at Dr. Eric Bogatin's "Signal integrity and power integrity simplified" for more information.
robertferanec , 07-29-2022, 07:23 AM
nearest reference plane:

"It is called the 3H rule. You may already be familiar with an implementation of this rule. 3H stands for three times the dielectric thickness or Height in the Z-axis from the signal layer to the nearest reference ground plane."
“Circle the wagons.” We can find wisdom in these Pilgrim words. The majority of multi-layer printed circuit boards feature at least one, and often a few or several layers that are a ground pour....

Use our interactive Discord forum to reply or ask new questions.
Discord invite
Discord forum link (after invitation)

Didn't find what you were looking for?