Computing slew rate through PSS analysis

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3 total messages Started by cupricwhistle@ya Mon, 28 Jul 2003 10:39

#3928

Author: cupricwhistle@ya
Date: Mon, 28 Jul 2003 10:39

13 lines
387 bytes

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

Re: Computing slew rate through PSS analysis

#3943

Author: vijayv@ececs.uc.
Date: Tue, 29 Jul 2003 22:14

30 lines
968 bytes

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

Re: Computing slew rate through PSS analysis

#3950

Author: Andrew Beckett
Date: Wed, 30 Jul 2003 13:55

47 lines
1478 bytes

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

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