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subcircuits in QRC

mdeas

 

I have a hierarchical schematic and made a parasitic extraction with QRC. In the resulting Spice netlist I can see my placed primitive cells and the new extracted parasitic elements. But the result is not a hierarchical netlist with subcircuits so I cannot see my subcircuits.

  • How can I configure QRC to create a hierarchical netlist?
  • If this is not possible: How can I configure QRC to not expand the subcircuits?
  • If this is not possible too: Is there an easy way to define my subcircuits as primitive cells?

 

  • Hi mdeas

    QRC by default gives flat output. A hierarchical output can be generated as follows:
    a. Preserve all cells during LVS (e.g. use ?preserveCells cmd for Assura-QRC flow or use hcell cmd for PVS-QRC & Calibre-QRC flows)
    b. In "Extraction" tab of QRC form, enable hierarchical extraction

    Please refer to more details in $QRC_HOME/doc/qrcxUser/qrcxUser.pdf. Please note that hierarchical extraction requires a QRC XL license.

    Best regards
    Quek

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