[SI-LIST] Re: Scale option in Hspice

Andrew:

  =20
   If you look at Hspice maual ( page 4-35) in document " Hspice
analysis and simulation user guide"  ( version 2004.03), it says:=20

   Td: signal delay from transmission line, in seconds per meter
   L : physical length of the transmission line, in units of meters.
Default =3D1
  =20
   I also did  a simple spice simulation, first define  T element as :

    TXtline near  vss far vss Z0=3D50  Td=3D5n , total delays is 5n
=20
   next define T element as:
  =20
     TXtline near  vss far vss Z0=3D50  L=3D2 Td=3D5n , total delays is =
10n

  Since the default value of L is 1 meter, that why  Td "looks like" the
total delay of the transmission line. I ask this " scale"  question
because I find out in some cases, scale option affects Td but  not
affects L.=20

Thanks,
Jing=20

-----Original Message-----
From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
On Behalf Of Andrew Ingraham
Sent: Saturday, May 28, 2005 6:48 PM
To: si-list@xxxxxxxxxxxxx
Subject: [SI-LIST] Re: Scale option in Hspice


It affects length, not time.

T-elements have no "length".  The delay you specify is the total delay,
not the delay per length.  In your case it is 5ns, period.

In my opinion, the "scale" option is one of the more dangerous features
in Hspice.

Regards,
Andy

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 =20



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