Prev: Bluetooth Antenna Design FAIL
Next: Blew the fuse in my multimeter, wanted to replace it, grabbed it, but
From: Etienne Menier on 28 Apr 2010 04:13
Hi all,

I am working on an 10Mbps/100Mbps Ethernet device. On this device, I
want to qualify the Ethenet signal quality.
I use for this operation a dedicated application on an DSO.

This application reports two failures concerning rise/fall symmetry.
The falling edge (4.907ns) is slower as the rising edge (4.38ns).

As I have no visible overshoot, I suppose that the impedance are
matching. I imagine that this dissymetry comes from the PHY driver
stage.

But is there a way to reduce this dissymetry as I can not change the
selected PHY?

Thank you in advance for the help.

Etienne
From: Etienne Menier on 29 Apr 2010 02:31
On 28 avr, 10:13, Etienne Menier <etienne.men...(a)gmail.com> wrote:
> Hi all,
>
> I am working on an 10Mbps/100Mbps Ethernet device. On this device, I
> want to qualify the Ethenet signal quality.
> I use for this operation a dedicated application on an DSO.
>
> This application reports two failures concerning rise/fall symmetry.
> The falling edge (4.907ns) is slower as the rising edge (4.38ns).
>
> As I have no visible overshoot, I suppose that the impedance are
> matching. I imagine that this dissymetry comes from the PHY driver
> stage.
>
> But is there a way to reduce this dissymetry as I can not change the
> selected PHY?
>
> Thank you in advance for the help.
>
> Etienne

No ideas or suggestion?

Etienne
 | 
Pages: 1
Prev: Bluetooth Antenna Design FAIL
Next: Blew the fuse in my multimeter, wanted to replace it, grabbed it, but