From: Perry Qu ([email protected])
Date: Tue Aug 01 2000 - 13:01:01 PDT
Hi!
I think Hassan's reply to my question this morning will be helpful for
you guys, especially those working with both PC Windows platform and
Unix workstation and do "cut & paste" on text file from PC to UNIX. Be
aware of the strange characters invisible in SUN's standard desktop
editor, which can be seen using UNix's textedit. It is exactly those ^M
that cause problems in my simulation.
Regards
Perry
attached mail follows:
Perry,
You possibly have a corrupt file. This may happen if the file was initially
created on a UNIX machine and now you're working on it on a Windows PC or
vice versa. If you're now working on it on a UNIX machine you have to find a
way to remove the carriage returns which may appear as ^M characters if you
edit the file using a vi editor. In vi, use the following command to remove
the ^M characters:
:%s/Ctrl-V Enter//g
where "Ctrl-V Enter" means press the Ctrl key and then letter V and then
the Enter key.
Good luck.
Hassan.
-----Original Message-----
From: Perry Qu [mailto:[email protected]]
Sent: Tuesday, August 01, 2000 9:25 AM
To: [email protected]
Subject: Re: [SI-LIST] : Urgent help needed on HSPICE simulation
Good morning, everyone:
Thank you for your help on my previous question posted on the SI list. I
tried out
the SPICE simulation that you guys suggested and I have the following
problems:
1. For a simple differential driver -> differential pair TL -> differential
receiver
kind of setup, I got the following error message when I run HSPICE:
**error** no definition for 0:
it was called by 0:v_inputp
**error** no definition for 0:
it was called by 0:v_inputn
My SPICE file looks like:
#######################
.options acct nomod post=1
v_inputP nd_inP 0 pulse (0V 1V 10ns 150ps 150ps 653.5ps 1.607ns)
v_inputN nd_inN 0 pulse (1V 0V 10ns 150ps 150ps 653.5ps 1.607ns)
* 50 ohm transmission line on high speed output
t0 (nd_outP 0 in_P 0) z0=50.0 td=500e-12
t1 (nd_outN 0 in_N 0) z0=50.0 td=500e-12
b_out_P nd_puP nd_pdP nd_outP nd_inP
+ file = 'transmit.ibs'
+ model = 'LVDSout'
+ typ = typ
+ power = on
+ buffer = output
b_out_N nd_puN nd_pdN nd_outN nd_inN
+ file = 'transmit.ibs'
+ model = 'LVDSout'
+ typ = typ
+ power = on
+ buffer = output
b_in_P nd_pc_P nd_gc_P in_P nd_out_of_P
+ file = 'recieve.ibs'
+ model = 'LVDSin'
+ typ = typ
+ power = on
+ buffer = input
b_in_N nd_pc_N nd_gc_N in_N nd_out_of_N
+ file = 'recieve.ibs'
+ model = 'LVDSin'
+ typ = typ
+ power = on
+ buffer = input
* 100 ohm differential terminator for high speed output
r0 (in_P in_N) r=100.0 m=1.0
.tran 10p 36n
.temp 60
.end
######################
2. In another case, I used a driver with SPICE model to drive a LVDS
differential
receiver with IBIS model. The voltage swing I got at the receiver pin much
larger
than the LVDS specifications. Do you have any idea what could be wrong ?
Thank you very much for your help.
Best Regards
Perry
SI Specialist
Alcatel CID
Kanata, ON, Canada
Tel: (613) 7846720
Perry Qu wrote:
> Dear SI Experts:
>
> I need some urgent help from you on the HSPICE simulation of differential
pair.
> Since I know very little about HSPICE, I would like to ask you the
following
> questions:
>
> 1. Can I do mixed simulation with HSPICE by using both SPICE models and
IBIS
> models for my driver/reciever pair ?
> 2. How can I do the differential signal simulation in HSPICE for a
simple
> topology, saying a differential driver drive a differential receiver
through a
> 100 ohm differential pair transmission line ? If anyone can give me a
simple .sp
> example, that will be great.
>
> Thank you very much for your help.
>
> Perry
>
> ------------------------------------------------------------------------
> Name: perry.qu.vcf
> perry.qu.vcf Type: VCard (text/x-vcard)
> Encoding: 7bit
> Description: Card for Perry Qu
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