Zero-Crossing-Based Ultra-Low-Power A/D Converters Citation
نویسندگان
چکیده
| Since the first demonstration of a comparatorbased switched-capacitor circuit, analog-to-digital (A/D) converters based on virtual ground detection have made steady and significant progress. Comparators have been replaced by zero-crossing detectors, leading to the development of zerocrossing based circuits for faster speed and lower power. All facets of performance including the sampling rate, effective number of bits, noise floor, and figure-of-merit have improved substantially. This paper focuses on recent implementations of zero-crossing based A/D converters and discusses the technical issues unique to these A/D converters as well as solutions that have been developed to improve their performance and practicality. A series of prototype designs whose performance ranges from 8 bit, 200 MS/s to 12 bit, 50 MS/s are described. The ultimate low power potentials of these A/D converters are compared with various different types of complementary metal–oxide–semiconductor A/D converters from a fundamental thermal noise standpoint.
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