Computing slew rate through PSS analysis

[cupric]

Hi!

I am running a PSS analysis for a frequency divider. I want to compute
the slew rate for the resulting output waveform from the PSS
simulation. How do I do it?

There should be some way in which I could use the calculator function
"slew rate" for this (right?). But, I don't know how to input the
waveform information to this function in the calculator.

thanks in advance.

cupric

 

[Vikas Vijay]

hi,
In the calculator u can use
slewrate((v "/net5" ?result "pss-td.pss" ?resultsDir
"/home/ur-result-path") 3e-10 t 4e-10 t 10 90)

assuming net5 is ur output net and 3e-10, 4e-10 represents the initial
and final xcoordinates of ur computation and 10, 90 represent the low
and high percentages of the step for ur calculation. If you want to
use the y coordinates replace 't' by 'nil'.

check out ocean manual for more.

Hope this helps
-Vikas


cupricwhistle@yahoo.com (cupric) wrote in message news:<7d250b17.0307280939.7f6b71d8@posting.google.com>...

Hi!

I am running a PSS analysis for a frequency divider. I want to compute
the slew rate for the resulting output waveform from the PSS
simulation. How do I do it?

There should be some way in which I could use the calculator function
"slew rate" for this (right?). But, I don't know how to input the
waveform information to this function in the calculator.

thanks in advance.

cupric

 

[Andrew Beckett]

Note, you can miss out the ?resultsDir quite happily in the expession.

Alternatively, you can use the "data" button on the RF page of the calculator,
select the pss-td results, and then click on the node - this will get
you the time domain waveform which you can then use the slewrate special
function on.

Andrew.

On 29 Jul 2003 22:14:42 -0700, vijayv@ececs.uc.edu (Vikas Vijay) wrote:

hi,
In the calculator u can use
slewrate((v "/net5" ?result "pss-td.pss" ?resultsDir
"/home/ur-result-path") 3e-10 t 4e-10 t 10 90)

assuming net5 is ur output net and 3e-10, 4e-10 represents the initial
and final xcoordinates of ur computation and 10, 90 represent the low
and high percentages of the step for ur calculation. If you want to
use the y coordinates replace 't' by 'nil'.

check out ocean manual for more.

Hope this helps
-Vikas


cupricwhistle@yahoo.com (cupric) wrote in message news:<7d250b17.0307280939.7f6b71d8@posting.google.com>...
Hi!

I am running a PSS analysis for a frequency divider. I want to compute
the slew rate for the resulting output waveform from the PSS
simulation. How do I do it?

There should be some way in which I could use the calculator function
"slew rate" for this (right?). But, I don't know how to input the
waveform information to this function in the calculator.

thanks in advance.

cupric

--
Andrew Beckett
Senior Technical Leader
Custom IC Solutions
Cadence Design Systems Ltd