Several problems with interfacing Spectre through Matlab

Dear Community

I am trying to use Matlab's Spectre toolbox to read out simulation results. I am using Matlab 2021a and Spectre version 20.10.186

In particular, I want the following outputs:

• Many operating point parameters from all transistors in the schematic
• The AC waveform from a current signal, taken from the terminal "/R0/PLUS"
• The total output noise (as waveform in V/sqrt(Hz)) from a linear noise analysis where the output nodes are named "/Ip" and "In", respectively.
• The loop gain from an iprobe

When I type the command

cds_srr(result_dir)

I get the following output:

PSFversion: 1.00
dcOp-dc (dc).
dcOpInfo-info (info).
ac-ac (ac).
tran-tran (tran).
finalTimeOP-info (info).
modelParameter-info (info).
element-info (info).
outputParameter-info (info).
designParamVals-info (info).
primitives-info.primitives (info.primitives).
subckts-info.subckts (info.subckts).
variables (design_variables).

ans =

 12×1 cell array

 {'dcOp-dc' }
 {'dcOpInfo-info' }
 {'ac-ac' }
 {'tran-tran' }
 {'finalTimeOP-info' }
 {'modelParameter-info' }
 {'element-info' }
 {'outputParameter-info' }
 {'designParamVals-info' }
 {'primitives-info.primitives'}
 {'subckts-info.subckts' }
 {'variables' }

Problem 1:
I cannot get any DC operating point parameter. When I use

cds_srr(result_dir,'dcOpInfo-info','M1.m1.gm')

I get the message:

Error: The special signal is not exist.
One or more output arguments not assigned during call to "cds_innersrr".

Error in cds_srr (line 20)
 sig = cds_innersrr(dirname, dataset, signame, verbose);

In the result brower, I can see that the operating points are there. How do I access them?


Problem 2:
Where is the result of the noise simulation stored? There is a folder called "noise" in the result brower, and a corresponding signal called "out" (which is the waveform I want in Matlab). But cds_srr does not return any noise dataset.


Problem 3:
Same for the stability analysis. There is a folder called "stb", but no corresponding dataset.

Problem 4:
I get the following output from the AC analysis when using cds_srr(result_dir,'ac-ac')

Total: 22 properties
'PSFversion' 'BINPSF creation time' 'PSF style' 'PSF types' 'PSF sweeps' 'PSF sweep points' 'PSF sweep min' 'PSF sweep max' 'PSF groups' 'PSF traces' 'simulator' 'version' 'date' 'design' 'analysis type' 'analysis name' 'analysis description' 'xVecSorted' 'tolerance.relative' 'start' 'stop' 'operating point producer' 

Total: 2 type(s) of signals
Signal type: V Data type: Complex
'net2' 'net3' 
Signal type: I Data type: Complex
'M0:1' 'V0:p' 'V1:p'

In the result browser, there are much more signals saved in the ac folder (including my ""/R0/PLUS" signal which I want). Why can I not see them in Matlab?

Thank you for your help.
Best wishes,
Dominik