Modelling of a Capacitance-to-Period Converter Dedicated to Capacitive Sensors
Résumé
This paper analyses a BiCMOS integrated circuit for interfacing capacitive sensors. A demonstrator has been implemented to evaluate its actual behaviour. This converter is based on the charge and the discharge of a capacitor with a constant current. A simple analytical model as first-order theory has been compared with PSPICE simulations and experimental data. Significant errors reveal the influence of leakage currents, stray capacitors and interference due to clock feedthrough and charge injection phenomena. Analytical and electrical models have been extended to include these parasitic parameters and simulate properly their thermal behaviour. Experimental data show close agreement between these models and practice.
Domaines
ElectroniqueOrigine | Fichiers produits par l'(les) auteur(s) |
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