[SI-LIST] Re: Routing diff pair HDMI signals at 85 Ohms as opposed to 100 Ohms reduces radiation?
- From: "Lee " <leeritchey@xxxxxxxxxxxxx>
- To: <boris.traa@xxxxxxxxxxx>, <jeff.loyer@xxxxxxxxx>, <tom_cip_11551@xxxxxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Mon, 17 Dec 2012 12:56:09 -0800
More than most of the time. More like all the time. And how you route ort
he impedance doesn't change that.
-----Original Message-----
From: Traa, Boris
Sent: Monday, December 17, 2012 12:10 PM
To: jeff.loyer@xxxxxxxxx ; tom_cip_11551@xxxxxxxxxxx ; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Routing diff pair HDMI signals at 85 Ohms as opposed
to 100 Ohms reduces radiation?
Most of time the common mode effects are the cause of EMI
Kind regards
Boris Traa
System design engineer EMC
It's the currents that make circuits work or fail.
Philips Innovation Services/EMC center
Room 2.020
High Tech Campus 26
5656AE Eindhoven, The Netherlands
Tel: ++ 31 40 27 43766
Fax: ++ 31 40 27 42224
E-mail: boris.traa@xxxxxxxxxxx
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of Loyer, Jeff
Sent: Monday 17 December 2012 5:31 PM
To: tom_cip_11551@xxxxxxxxxxx; si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Routing diff pair HDMI signals at 85 Ohms as opposed
to 100 Ohms reduces radiation?
Much of the reasoning for 85 ohms is outlined in the paper "Improve Storage
IO Performance by Using 85Ohm Package and Motherboard Routing", but that is
for the entire channel, not just a segment of it (as Steve said).
I can imagine someone reasoning that the increased coupling implied by 85
ohms would decrease EMI, but am skeptical that would be the case in
practice.
Jeff Loyer
-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
Behalf Of miner_tom Cipollone
Sent: Sunday, December 16, 2012 4:19 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Routing diff pair HDMI signals at 85 Ohms as opposed to
100 Ohms reduces radiation?
I was told recently that in order to help reduce radiated emissions in HDMI
signals, routed from a PCB to an HDMI connector, that it was better to route
the signals at 85 Ohms differential as opposed to 100 Ohms differential.
The contention was that with added connector L/C the overall average
impedance normalized closer to 100 Ohms.
Is there any credence to this? Is there any research material that agrees
with this?
(Hi Nazish)
Thank You
Tom
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