In this paper we make use of a mixed analogue-digital HDL to model sampled-data systems. Modelling solutions are presented to code some sampled-data behaviour using either analogue or digital constructs of the language.Two key operations -sampling and shifting -are presented first. Then, these facilities are used to code difference equations. This approach is validated on the example of a sampled-data filter. Finally, a 'real-life' switched-capacitor A to D converter is modelled and simulated. The results are compared with a transistor-level description.
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