Study on sparkle and metastability in Flash A/D convertor
Dongmei Li · Journal of Circuits and Systems · 2009
Flash A/D converter is widely used with its high speed and simple structure.,however,it may call for a large size when the precision is strictly required.The noise caused by sparkle in thermometer code and metastability deeply affects the performance of Flash A/D converters and depends upon the chosen coding.In this paper,the ways to avert sparkle and metastability are described.A procedure for comparing the performance of different encoders are introduced and actualized with SIMULINK.The result of the comparison is that the encoder with the structure of Wallace Tree gives the best performance for reducing errors.