Abstract
This chapter discusses the design of the analog-to-digital converter (ADC) of a precision smart temperature sensor. This ADC converts the voltages V BE and ΔV BE (generated using the techniques introduced in the previous chapter) to a digital temperature reading. The chapter starts with an overview of the requirements that have to be met in this application. After a brief overview of different types of ADCs, sigma-delta (ΣΔ) ADCs are shown to be particularly suited for the narrow bandwidth signals found in temperature sensors. The system-level design of first- and second-order ΣΔ modulators and the associated decimation filters is discussed. Since dynamic error correction techniques (such as dynamic element matching) are needed to accurately generate V BE and ΔV BE , special attention is paid to the filtering of the associated dynamic error signals.
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Pertijs, M.A., Huijsing, J.H. (2006). SIGMA-DELTA ANALOG-TO-DIGITAL CONVERSION. In: PRECISION TEMPERATURE SENSORS IN CMOS TECHNOLOGY. Analog Circuits and Signal Processing. Springer, Dordrecht . https://doi.org/10.1007/1-4020-5258-8_4
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