[SI-LIST] Re: impedance mismatch
- From: V S <for_si2003@xxxxxxxxx>
- To: clandrum@xxxxxxxxx,"'si-list@xxxxxxxxxxxxx'" <si-list@xxxxxxxxxxxxx>
- Date: Wed, 5 Nov 2003 06:27:12 -0800 (PST)
<Assuming that IC1 is the source and IC2 is the
receiver ALL OF THE TIME, I would simply series
terminate the transmission line as close to IC1 as
possible.>
I believe the result will hold good even if IC2 is the
transmitter and IC1 is the receiver.
Simulation should be performed for confirmation.
V S
--- Chris Landrum x311 <clandrum@xxxxxxxxx> wrote:
> Assuming that IC1 is the source and IC2 is the
> receiver ALL OF THE TIME, I
> would simply series terminate the transmission line
> as close to IC1 as
> possible. A 25 Ohm resistor should make up the
> difference.
>
> -----Original Message-----
> From: Chin, Dominic Kin Hii
> [mailto:dominic.kin.hii.chin@xxxxxxxxx]
> Sent: Wednesday, November 05, 2003 3:05 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] impedance mismatch
>
>
>
>
>
> Hi experts,
> I am doing PCB design to communicate IC1 to IC2. The
> termination of
> these ICs:
>
> IC1 buffer: 25 ohm
> IC2 buffer: 50 ohm
>
> If I use a 50 ohm trace, there will be impedance
> mismatch and reflection
> at IC1 or vice versa. How should I design PCB to
> cater for these
> different terminated impedance ICs?=20
>
> Thanks
> Dom
>
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