Problem with PNoise

[Allen]

I am doing PNoise using ADE with modified netlist. The way how I do it
is the following.
First, run PSS and PNoise using ADE with the original circuit
Second, modified the netlist by replacing all components substrate node
by my own substrate model.
Their, run simulatoin again using ADE with the modified netlist.
I got the expected result for PSS and DC, however PNoise simulatoin
result is not available in the direct plot form. And I got this warning
message in the log file "Warning from spectre during PNoise analysis
'pnoise'. pnoise: Stop limit not given. Logarithmic steps cannot be
used."

Can anyone give me some suggestions on how to solve this problem?
Thanks.

Best
Allen

 

[Andrew Beckett]

On 18 Aug 2006 08:39:30 -0700, "Allen" <oceandai@yahoo.com> wrote:

I am doing PNoise using ADE with modified netlist. The way how I do it
is the following.
First, run PSS and PNoise using ADE with the original circuit
Second, modified the netlist by replacing all components substrate node
by my own substrate model.
Their, run simulatoin again using ADE with the modified netlist.
I got the expected result for PSS and DC, however PNoise simulatoin
result is not available in the direct plot form. And I got this warning
message in the log file "Warning from spectre during PNoise analysis
'pnoise'. pnoise: Stop limit not given. Logarithmic steps cannot be
used."

Can anyone give me some suggestions on how to solve this problem?
Thanks.

Best
Allen

Allen,

Can you post the bottom part of the input.scs (all the analysis and options
statements) - this will give a clue as to what is the root cause of the error?

Regards,

Andrew.
--
Andrew Beckett
Principal European Technology Leader
Cadence Design Systems, UK.