[SI-LIST] Re: LA probes

Dear Anand
It may be happening because of probe loading. Please check your Probe
Capacitance, Frequency of Operation and also Load impedance.


Best Regards
Prajit


On 7/30/07, SRINIVASAN ANAND-B06739 <anand.srinivasan@xxxxxxxxxxxxx> wrote:
>
> Content-Type: text/plain;
>        charset="us-ascii"
> Content-Transfer-Encoding: quoted-printable
> Hi All,
> I have a problem. Given below is a topology that i have.=20
>
>
>
> =20
>
> =20
>
> I have a bidirectional bus which connects a FPGA to the CHIP. The
> distance between them is 2 inches. Now to probe this bus, i have the
> signals coming out to the right at a distance of about 6 inches. Note
> that i am using active probes to probe this interface and there are NO
> buffers on the line between the chip and LA probes. Now the problem is
> that when the LA is plugged in I find that the strength of the signals
> driven by the chip comes down from 3.3V to 2V. Without the LA plugged,
> the signal strength remains intact. Could anyone help me in
> understanding this? If a solution is possible to get around this, it
> will be great.
>
> =20
> Regards,
> Anand
>
> =20
>
> =20
>
>
>
>
> -- Binary/unsupported file stripped by Ecartis --
> -- Type: image/jpeg
> -- File: Outlook.jpg
> -- Desc: Outlook.jpg
>
>
> ------------------------------------------------------------------
> To unsubscribe from si-list:
> si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
>
> or to administer your membership from a web page, go to:
> http://www.freelists.org/webpage/si-list
>
> For help:
> si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
>
>
> List technical documents are available at:
>                http://www.si-list.net
>
> List archives are viewable at:
>                http://www.freelists.org/archives/si-list
> or at our remote archives:
>                http://groups.yahoo.com/group/si-list/messages
> Old (prior to June 6, 2001) list archives are viewable at:
>                http://www.qsl.net/wb6tpu
>
>
>


------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field

or to administer your membership from a web page, go to:
http://www.freelists.org/webpage/si-list

For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field


List technical documents are available at:
                http://www.si-list.net

List archives are viewable at:     
                http://www.freelists.org/archives/si-list
or at our remote archives:
                http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
                http://www.qsl.net/wb6tpu

Other related posts: