[SI-LIST] AW: Re: more on PWL statement generation for PRBS simulatio n in spice

Hello,

one stupid question:

I thought PRBS is a well defined sequence (with undefined starting =
point).
So how could the Excel int(rand()+0.5) function create this sequence ?
I expected this to be (more or less) random!

regards

hermann

-----Urspr=FCngliche Nachricht-----
Von: Keskinen, Kai [mailto:KaiKeskinen@xxxxxxxxxxxxx]
Gesendet am: Freitag, 22. November 2002 13:49
An: 'Raymond.Anderson@xxxxxxx'; si-list@xxxxxxxxxxxxx
Betreff: [SI-LIST] Re: more on PWL statement generation for PRBS
simulatio n in spice


The same thing can be easily done using the int(rand()+0.5)function in
excel.

Cheers,

Kai Keskinen
Signal Integrity Advisor
Solectron Technical Center
425 Legget Drive,=20
Kanata, ON K2K 2W2
kaikeskinen@xxxxxxxxxxxxx
www.solectron.com



-----Original Message-----
From: Ray Anderson [mailto:Raymond.Anderson@xxxxxxx]
Sent: Thursday, November 21, 2002 4:00 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] more on PWL statement generation for PRBS simulation
in spice



Follow on to my recent posting on generation PWL PRBS
excitation for spice simulations.

I mentioned that one could take the recently posted Perl
code and modify it to output a PWL statement.

Check the Microsim app note document at:

  http://www.pspice.com/upload/appnotes/appnts.pdf
 =20
 On page 231 of the pdf file a chapter entitled
 "Test Analog circuits with Random Digital Data"
 begins. On page 233, figure 124 is a simple program
 listing in BASIC that allows one to generate a PWL
 statement based on random data generated by the BASIC
 rand() statement. The logic in that listing could be
 ported into the PERL prbs code to create an integrated
 program.
=20
 -Ray

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