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MODELING

As opposed to system-level behavioral modeling, which describes what the system does, modeling of active and passive on-chip elements during circuit design is done to improve the fidelity of the simulation. Especially problematic is the process of modeling spiral inductors on RFIC circuits, which are critical for filtering and tuning purposes (Fig. 9-14). When modeling these elements it is vital that the Q of the inductor and the resonance be predicted accurately. Because of their complex structures, this is often an extremely difficult, nontrivial task (Fig. 9-15). Note that the Cadence SpectreRF Simulator includes a Virtuoso Passive Component Modeler (VPCM) capability which enables synthesis, verification and modeling of spiral inductors and transformers. It is a complete flow, integrated in the Virtuoso Schematic editor and layout suite, and is compatible with Assura. It produces a complete PDK component with schematic, symbol, pcell layout, S-parameter file and Spectre models.


  

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