[SI-LIST] Re: Crosstalk due to package
- From: Jory McKinley <jory_mckinley@xxxxxxxxx>
- To: Ravinder.Ajmani@xxxxxxxxxxxxxx, si-list@xxxxxxxxxxxxx
- Date: Fri, 2 Nov 2007 12:06:42 -0700 (PDT)
Yes in the order of 5% of your voltage pulse is not uncommon with package etch
lengths in the 150-200mil range. Do you have the power/ground returns modeled
for potential SSO or other pwr/gnd noise?
----- Original Message ----
From: "Ravinder.Ajmani@xxxxxxxxxxxxxx" <Ravinder.Ajmani@xxxxxxxxxxxxxx>
To: si-list@xxxxxxxxxxxxx
Sent: Friday, November 2, 2007 12:07:56 PM
Subject: [SI-LIST] Crosstalk due to package
Hi SI Experts,
I was running crosstalk simulations in a design using Cadence Allegro
PCB
SI GXL, and observed very high crosstalk (about 100 mV). The Driver
ASIC
is in a 10 x 10 mm 64-pin TQFP package. A similar design using the
previous version of the ASIC in same package had shown crosstalk of
about
50 mV only. The signal slew rate has not changed significantly between
the two ASIC versions. Only difference was that the package model for
the
older ASIC was a simple RLC model, whereas the ASIC vendor provided a
coupled model for the new ASIC package. To confirm my doubt, I edited
the
package model to remove the coupling parameters, and the crosstalk
dropped
to 50 mV.
I am curious if it is possible for a 10 x 10 mm TQFP package to
introduce
crosstalk to the tune of 50 mV.
Regards, Ravinder
Server PCB Development
Hitachi Global Storage Technologies
Email: Ravinder.Ajmani@xxxxxxxxxxxxxx
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