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how to create lookup table VCVS in SPECTRE

Frank Cano

I'm trying to port a design from PSPICE to SPECTRE and using the pspice_include directive but it is not parsing some of the PSPICE structures.

EABC NODE1 0 TABLE { V(NODE2, 0) }
+ ( (1,4) (2,2) (3,1) (4,0) (9,6) (10,4) (11,3) (12,0) (17,7) (18,6) (19,5)
+ (20,0) (25,7) (26,7) (27,7) (28,0) )

How would one implement this in SPECTRE?

This is a voltage controlled voltage source with a transfer function table.

Thanks!
Frank Cano

  • ShawnLogan

    Dear Frank Cano,

    Frank Cano said:

    How would one implement this in SPECTRE?

    This is a voltage controlled voltage source with a transfer function table.

    There may be other methods that are superior, but one way might be to consider creating a verilog-A based model using its inherent table function. The lookup elements are placed in a text file referred to in the verilog-A code. Cadence has one example of a time varying resistor whose resistance values are specified as a function of time in a table contained in text file at URL:

    https://support.cadence.com/apex/ArticleAttachmentPortal?id=a1Od0000000nb8qEAA&pageName=ArticleContent

    Shawn

  • mschw
    in reply to ShawnLogan

    Dear Frank Cano and Shawn,

    this article gives some hints how to translate PSpice in Spectre. Controlled sources are explained on the slides 26-29.

    Regards

    Matthias

  • Andrew Beckett
    in reply to mschw

    which version of Spectre are you using? I tried with Spectre 21.1 ISR17 and it runs with no problem and appears to be doing the table lookup correctly from the output waveform.

    I can check older versions, but knowing what you're using would be a good starting point for me to check.

    Andrew 

  • Andrew Beckett
    in reply to Andrew Beckett

    Frank,

    I checked all the base versions from SPECTRE211 all the way back to MMSIM151 and it worked in all of them, so I'm not sure what is going wrong in your case. What is the error you get?

    Andrew

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