摘要 |
PROBLEM TO BE SOLVED: To solve some of problems caused by combining two conventional flash analog/digital conversion technologies employed for a high-speed flash analog/digital converter. SOLUTION: This invention provides a method for implementing an automatic zero function for the flash analog/digital converter ('ADC'). The ADC has a reference voltage circus that provides analog reference voltages that are equally spaced and system voltage comparators that compare an input voltage with the reference voltages to give an instruction of which reference voltage corresponds to the input voltage. This method includes the following steps; a plurality of redundant voltage comparators are provided, a subset of the system voltage comparators is selected, auto-zero is implemented for the selected comparators, the redundant comparators are used in place of the selected comparators, and an output of the main comparator array is combined with an output of the redundant comparators to generate a final digital output.
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