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Pass Parameter Value to Hierarchical Schematic Part

teevskis

I'm having trouble passing a parameter value to a hierarchical schematic part.  Here are the details:

1. I created a library part with this PSpice Template definition: X^@REFDES %VCC+ %VCC- %+ %- %OUT @MODEL PARAMS:  ?IDC|IDC=@IDC||IDC=1e-3|

2. In the library part I added a parameter called IDC, also with a default value of 1e-3

3. Then I created a hierarchical part with a schematic that has a DC current source value that I set to {IDC}

The problem is that unless I add to the hierarchical part schematic a PARAM block with a parameter called IDC and a value, my simulation of a design using the hierarchical part won't run (can't identify IDC parameter).  But when I do add the PARAM block to the hierarchical part schematic, its value overrides the one in my simulation design schematic.

Ideas anyone?

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  • teevskis

    Perhaps I'm being thick, but I think something is getting lost in my poor description of what I'm doing. Perhaps some screen shots will help. So, first I created a PSpice library part as follows (I've shown some of the part properties for clarity, even though I'll turn off their visibility normally):

    As you can see by the Implementation Type this hierarchical part is then attached to a schematic where the parameter 'idc' is used as the DC value for a current source. Notice the PARAM block - until I added this to the schematic, I would get an "Undefined parameter: idc" error during netlisting.

    Finally, I placed the library part in one of my simulation design schematics and set 'idc' to a value different than the 1e-3 default:

    Of course the value in the PARAM block is used, not the value I want to be passed from the design schematic (70e-9).

    So what am I doing wrong?

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  • teevskis

    Perhaps I'm being thick, but I think something is getting lost in my poor description of what I'm doing. Perhaps some screen shots will help. So, first I created a PSpice library part as follows (I've shown some of the part properties for clarity, even though I'll turn off their visibility normally):

    As you can see by the Implementation Type this hierarchical part is then attached to a schematic where the parameter 'idc' is used as the DC value for a current source. Notice the PARAM block - until I added this to the schematic, I would get an "Undefined parameter: idc" error during netlisting.

    Finally, I placed the library part in one of my simulation design schematics and set 'idc' to a value different than the 1e-3 default:

    Of course the value in the PARAM block is used, not the value I want to be passed from the design schematic (70e-9).

    So what am I doing wrong?

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