Re: [SI-LIST] : Urgent help needed on HSPICE simulation

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From: Perry Qu (perry.qu@alcatel.com)
Date: Tue Aug 01 2000 - 06:25:11 PDT


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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