[SI-LIST] Re: TMDS routing through multiplexer
- From: steve weir <weirsp@xxxxxxxxxx>
- To: ivor@xxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Thu, 12 Feb 2004 12:26:04 -0800
Ivor, the options that make sense to me:
1) Eat the mismatch, simplest.
2) Use 50 ohm traces and apply a parallel resistor on either side of the
part to match the network to the line impedance. This will impose a little
loss, around 1db, but that shouldn't be any big deal.
Steve.
At 10:21 AM 2/12/2004 -0800, Ivor Bowden wrote:
>What special considerations should be made for routing DVI (TMDS)
>signals through a FET multiplexer, such as the Pericom P13DBV20 (
>http://www.pericom.com/products/switch/assp/psempart.php?productID=PI3DBV20
>) or the IDT QS4A201 (
>http://www.idt.com/products/pages/Bus_Switches-QS4A201.html ) ? Has
>anyone used these parts, can comment on their use in this application?
>
>DVI impedance is 100 ohm differential. As the switch on resistance is
>about 4 ohms, should I route from the DVI transmitter 46 ohm (loosely
>coupled) traces to the switch, and then 50 ohm to the connector? I
>assume I will need to increase the drive slightly to make up for the
>insertion loss. What sort of performance loss compared to continuous
>copper trace routes should I expect?
>
>Any ideas much appreciated,
>
>Ivor Bowden
>
>
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