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APN1004: Varactor SPICE models for RF VCO applications

Posted: 12 Mar 2007 ?? ?Print Version ?Bookmark and Share

Keywords:varactor model? RF VCO? varactor? varactor model extraction? S-parameter?

This varactor model is useful for RF VCO applications although it neglects some parasitic components often needed for higher frequency microwave applications, such as the distributed line package model and some capacitance due to ground proximity. For most RF VCO applications, to about 2.5GHz, these parasitic components would not be important unless higher harmonics generated by the varactor affect performance of the VCO. In this case, a more detailed equivalent circuit model is needed. The technique used should be based on the varactor model extraction procedure from S-parameter data.

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