[SI-LIST] Re: Simulationsof a connector
- From: "istvan novak" <istvan.novak@xxxxxxxxxxxxxxxx>
- To: <michael.kurten@xxxxxxxxxxxxxxx>
- Date: Mon, 20 Jan 2003 20:28:01 -0500
Michael,
If by grounding 21 pins you mean to connect both ends of 21 connector pins
to ideal SPICE node zero, this way you create 21 hal-wave resonators. You
can try to terminate the unused pins instead of grounding. If in the
connector you use the unconnected pins to provide isolation between the
active and victim pins, this will eliminate the effectiveness of the
shielding pins. If you dont need the 21 pins for shielding/isolation,
matching those pins will probably get rid of the ringing without adversely
affecting your crosstalk result.
Regards
Istvan Novak
SUN Microsystems
----- Original Message -----
From: "Michael Kurten" <michael.kurten@xxxxxxxxxxxxxxx>
To: "Si-List" <si-list@xxxxxxxxxxxxx>
Sent: Monday, January 20, 2003 6:14 PM
Subject: [SI-LIST] Simulationsof a connector
>
> I'm simulating a connector (6x6 coupled spice model) with HSPICE to
> determine the crosstalk caused by the connector. The connector is
connected
> to one active line, 14 quiet lines, and the remaining 21 pins are
grounded.
>
> * topology of the active line
> *
> * source 50Ohm 50Ohm 50Ohm 50Ohm 50ohm
> * |>--/\/\/----=========----{CONNECTOR}-------=========---/\/\/--|gnd_a
> * | | |
> * = = \ 1e6Ohm
> * | | /
> * gnd | |
> * | gnd
> * |
> * gnd_a
> * topology of the quiet lines
> *
> * gnd 50Ohm 50Ohm 50Ohm 50Ohm 50Ohm
> * |---/\/\/----=========----{CONNECTOR}----=========---/\/\/--|gnd_a
> * | |
> * = =
> * | |
> gnd gnd_a
>
> The active line is excited by a single rising edge with a rise time of
> 500ps.
> The transmission lines are all 50 Ohm T-element
> The capacitors at the left and right side of the connector have a value of
> 1.0pF
> The grounded pins are connected directly to ground via a 1m resistor in
> parallel with a 1.0pF capacitor
>
> The results on the quiet lines show the crosstalk followed by an
> establishing sine function which decays very slowly. The frequency of the
> sine function is in the 4-5 GHz range.
>
> I'm trying to understand where this behavior comes from. I tried a couple
of
> arrangements to get rid of this sine function but none of them changed the
> behavior significantly. E.g. option gshunt and cshunt, connecting gnd and
> gnd_a via a high impedance resistor and a small capacitor.
>
> Any help is highly appreciated.
>
> Regards
> Michael
>
>
>
>
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