[SI-LIST] Re: Scale option in Hspice

Andrew is completely correct.  The scale feature is extensively used in the 
semiconductor models in HSPICE.  In fact I have had problems when different 
models use different scale factors.  If you need to come up with a scale 
factor introduce it as your own variable.

Have fun

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At 09:39 AM 5/31/2005 -0700, Jing Wu wrote:
>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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