LPE Comparison & Optimization

Belledonne™ is used for layout comparison via extracted netlist. It compares two different extracted netlists and is mainly used for layout parasitic extraction (LPE) flow qualification.

Belledonne is integrated with utility tool called Brenner that matches two different netlists. Brenner is used as the preparational step together with Belledonne, but it can also be used as a standalone.


Switching between different layout parasitic extraction tools (LPE) calibrating different settings to a new technology node, qualifying update releases and others are tasks consuming a lot of time of CAD departments.  Belledonne is the first software solution that is dedicated to LPE tool qualification.

Belledonne enables quick and accurate comparison of different parasitics netlists. The netlist can be generated by different LPE tools from different vendors or by the same LPE tool with different sets of extraction parameters.

Belledonne helps backend physical verification teams and design teams to understand, quantify and qualify the different solutions or options they use in their parasitic extraction flow.


  • Comparison of two netlists
    • Same LPE tool with different settings
    • Same LPE tool with different vendors
    • Different LPE tools from different vendors
  • Metrics
    • Effective resistance between pins
    • Effective delay between pins
  • Calculate different metrics for each netlist and compare


    • Accelerate the creation, update and delivery of PDK
    • Useful for PDK optimization and validation
    • Increase the robustness of design kits
    • Compare different LPE tools
    • Certify the accuracy of different LPE tools
    • Visualize impact of different LPE tools settings
    • Find bugs in LPE tools and have them fixed
    • Useful for choosing different design routing options

Fig: 1 Comparison result


  • Providers of Process Design Kits (PDK), CAD tool integrators and designers can use.       

Technical Specifications

  • Input: Two extracted netlists of similar layout, generated by LPE tool
  • Formats: DSPF, SPEF, SPICE, Spectre