Multiple Voltage Rails Message from Cadence

Note: I am posting this for Kumar, who is experiencing difficulties accessing
vhdl.org.

Will

To: ibis@vhdl.org
Subject: suggested data format for handling multiple rail

 Re: Ibis meeting on Oct 29, 1993
     Discussion on multiple voltage rails
     
     
Ibis specs as of today allows referencing v-i data to either a power
or ground rail. Now it has been recognized that multiple rails may
exist and there may be components connected to the output whose v-i
data may reference these other rails.

We at cadence have used a simple representation for v-i data which
embeds the rail reference voltage. Something similar, if adopted by
ibis will allow much greater flexibility and allow for painless
incorporation of multiple rails.

Following is a sample of the data format

datapoints vi vref=5
-5 -142ma
0.0 -137ma
0.5 -133ma
1 -128ma
1.5 -123ma
2 -118ma
2.5 -110ma
3 -98ma
3.5 -83ma
4 -64ma
4.5 -38ma
5 0
6 64ma
7 98ma
8 118ma
9 126ma
10 137ma
end vi

At the start of the vi statment the referencing voltage vref is
explicitly given. The voltage value in the left column is absolute
voltage (referenced to 0).

- kumar
Received on Fri Oct 29 15:12:42 1993