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probing signal in av_extracted_RC

HansB

Hello,

I'm trying to probe some internal signal nodes of an RC extracted circuit, searching for root cause of a DC  offset.

The simulation is a simple dcOp from ADE-L on a test bench defined by hierarchy editor.

Results-->Print-->DC node voltages  will indeed print the voltage on any node but only as long as that node coincides with a pin.

Any of the other intermediate nodes (separated by presistors)  are selectable and get highlighted but only produce a question mark.

Also the result browser does not get me any further.

I'm sure the simulator computed the all the internal node voltages, but how get them out? 

I tried Outputs-->Save All-->Select signals to output(save)="all" and various settings for "subcktprobelvl"

Also in QRC played with net_name_space = "SCHEMATIC" iso "LAYOUT". Does not make any difference.

Cadence-ic-/06.17.717.

groet

Hans

  • Quek

    Hi Hans

    Perhaps out-of-context probing is what  you need:

    a. Create config view which uses the extracted view
    b. Simulate using schematic linked to config view
    c. From top level schematic, descend into lower level schematic. You should see "Out of context" in the title bar of the window
    d. Do any probing


    Best regards
    Quek

  • HansB
    in reply to Quek

    Hi Quek,

    Thank you for the suggestion.

    What do you mean exactly with step b) ?

    I'm simulating a config view with the RC extracted circuit I want to probe, I don't see how I can replace that with schematic (if that is what you suggest) as the schematic does not contain the extracted parasitic R's that create some of the nodes I need to probe?

    groet

    Hans

  • Quek
    in reply to HansB

    Hi Hans  

    For step "b", I meant doing the simulation using a config view. I should written "extracted view linked to config view". You are trying to probe the voltage/current of the parasitic resistors. This cannot be done by the out-of-context probing which only probes RLCK values. The results browser should actually have the info. E.g.

    Rj1 (IN \8\:IN) resistor r=0.9789 l=1.305e-06 w=8e-08 tc1=0 tc2=0 c=0

    The node voltage for parasitic res Rj1 can be found in the results browser. Is your results browser not showing the info?


    Best regards
    Quek





    Best regards
    Quek

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