[SI-LIST] Re: Minimum length for SERDES
- From: cris_filip2002@xxxxxxxx
- To: "mickey.felton@xxxxxxx" <mickey.felton@xxxxxxx>
- Date: Fri, 20 Mar 2015 01:19:24 -0600
Mickey,
What spec are you considering and what minimum IL limit is required to avoid
the clipping that you are talking about?
Thanks,
Cristian
> On Mar 19, 2015, at 10:40 AM, Felton, Mickey <mickey.felton@xxxxxxx> wrote:
>
> Should also consider the max voltage output, and the max input voltage
> possible. Too little Insertion loss can lead to clipping.
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] On
> Behalf Of Conrad Herse
> Sent: Thursday, March 19, 2015 11:26 AM
> To: 'balaseven@xxxxxxxxx'; si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Re: Minimum length for SERDES
>
> In my experience I've found that, all other things being equal, shorter
> channels will exhibit more return loss than longer channels. So, as Chris
> points out, if you have lots of discontinuities in your channel you could
> have more trouble meeting return loss requirements with your shorter channels
> than with your longer channels.
>
> Conrad
>
>> On 3/19/2015 9:47 AM, Cotton, Chris wrote:
>> Of course, there could be a minimum requirement because the designer only
>> chose to validate signal integrity starting at some given length. But I
>> suspect that what you are really asking is if there is ever a need for a
>> minimum trace length requirement? I believe the answer is yes. For minimum
>> lengths, loss (i.e., insertion loss) will be low. If the driver and/or
>> receiver are mismatched to the channel impedance or if there are significant
>> discontinuities in the channel then reflections may take many roundtrips to
>> dampen and this may wreak havoc on your eye.
>>
>> Chris
>>
>> -----Original Message-----
>> From: si-list-bounce@xxxxxxxxxxxxx
>> [mailto:si-list-bounce@xxxxxxxxxxxxx] On Behalf Of bala
>> Sent: Thursday, March 19, 2015 10:36 AM
>> To: si-list@xxxxxxxxxxxxx
>> Subject: [SI-LIST] Minimum length for SERDES
>>
>> Hi all,
>> Is there any minimum trace length requirement for high speed SERDES?if yes,
>> why?
>>
>> Regards
>> bala
>>
>>
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