[SI-LIST] Re: Scale option in Hspice
- From: "Jing Wu" <JIWU@xxxxxxxxxx>
- To: <a.ingraham@xxxxxxxx>, <si-list@xxxxxxxxxxxxx>
- Date: Tue, 31 May 2005 09:39:45 -0700
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
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at: =20
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
=20
------------------------------------------------------------------
To unsubscribe from si-list:
si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field
or to administer your membership from a web page, go to:
//www.freelists.org/webpage/si-list
For help:
si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field
List FAQ wiki page is located at:
http://si-list.org/wiki/wiki.pl?Si-List_FAQ
List technical documents are available at:
http://www.si-list.org
List archives are viewable at:
//www.freelists.org/archives/si-list
or at our remote archives:
http://groups.yahoo.com/group/si-list/messages
Old (prior to June 6, 2001) list archives are viewable at:
http://www.qsl.net/wb6tpu
Other related posts:
