[SI-LIST] Re: Driver slew rates
- From: ravikumar potluri <potluri.ravikumar@xxxxxxxxx>
- To: steve weir <weirsi@xxxxxxxxxx>
- Date: Sat, 23 Nov 2013 17:47:31 +0100
I am sorry but the time scale in nanoseconds with 8ns cycle time. Yes, I
think I understand you correctly. The high transition rates indeed is the
cause for these reflections?. I have already terminated the traces
internally at the receiver. I think I need an external termination too If I
am not mistaken.
On Sat, Nov 23, 2013 at 5:41 PM, steve weir <weirsi@xxxxxxxxxx> wrote:
> The time scale is not visible in your traces, but the top trace is the
> result of an unterminated transmission line that is electrically long
> compared to the transition times. The signal energy is not being absorbed
> within the round trip so memories of transitions past haunt the present.
> Change the configuration of the receiver input buffer to terminate the
> signal.
>
> Steve.
>
> On 11/23/2013 8:26 AM, ravikumar potluri wrote:
>
> Thank you all very much. Please find the attached figure. I downloaded
> the IBIS model from TI and spartan websites. Also I used different drive
> strengths but no improvement.
>
> Regards,
> Ravi
>
>
> On Sat, Nov 23, 2013 at 5:20 PM, bala <balaseven@xxxxxxxxx> wrote:
>
>> Ravi,
>> Pls check driver's input impedance and use low strength model if your
>> tline
>> is short.check your package model too.
>> Regard
>> bala
>> On 23 Nov 2013 21:34, "steve weir" <weirsi@xxxxxxxxxx> wrote:
>> > No.
>> >
>> > Check your models and your simulation set-up.
>> >
>> > Steve.
>> > On 11/23/2013 7:48 AM, ravikumar potluri wrote:
>> > > Hello friends,
>> > > If the slew rate of driver is much higher than the slew rate of
>> receiver
>> > > does this cause reflections on the transmission line?
>> > >
>> > >
>> > > I am simulating ADS62P49, 250 MSPS ADC chip (Driver) with Spartan
>> 3A-DSP
>> > > (Reciever). I see lot of ringing at the output even when the chips are
>> > > connected directly with termination in between and with no
>> transmission
>> > > line.
>> > >
>> > > Could someone explain this?
>> > >
>> > > Thanks and Regards,
>> > > Ravi
>> > >
>> > >
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>
>
> --
> Steve Weir
> IPBLOX, LLC
> 1580 Grand Point Way
> MS 34689
> Reno, NV 89523-9998 www.ipblox.com
>
> (775) 299-4236 Business
> (866) 675-4630 Toll-free
> (707) 780-1951 Fax
>
> All contents Copyright (c)2013 IPBLOX, LLC. All Rights Reserved.
> This e-mail may contain confidential material.
> If you are not the intended recipient, please destroy all records
> and notify the sender.
>
>
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