NOVEL PIPELINED SWITCHED-CURRENT A/D CONVERTER FOR SMART SENSORS
I. Vecera, R. Vrba
Abstract:
This paper describes pipelined switched-current A/D converter designed in 0.6 µm BiCMOS technology. Modified conventional-restoring algorithm, called redundant-sign-digit (RSD), was implemented what decreases the amount of high-precision components. Two modes of operation are possible. By changing from pipeline conversion to cycling mode, less power dissipation is obtained at the expense of conversion time. Proposed A/D converter is suitable for conversion of the current with very low amplitude from analog into digital domain. Current mode enables operation down to 3 V thus is suitable for battery powered applications. The system integrates band-gap reference and independent supervisory circuit with 1% accuracy. Current consumption in sleep mode is less than 1 mA. A/D converter is prepared to meet 1452.2 specifications.
Keywords:
SI A/D converter, pipeline architecture, sensor applications
4th International Conference on Advanced A/D and D/A Conversion Techniques and their Applications (together with 7th IMEKO TC4 Workshop on ADC Modelling and Testing)
