SpectreRF can't just be used for RF circuits, but is also very useful for switched capacitor circuits (see e.g. http://community.cadence.com/cadence_blogs_8/b/rf/archive/2009/04/22/spectre-rf-by-any-other-name). This is the subject of a training course which is presented at http://www.cadence.com/training/eu/Pages/coursedetails.aspx?courseid=es_86122_ic6.1.6.
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