Patent ID: 8730363
Filing Date: 2014-05-20
Classification: H03M,H04N

Abstract:
1. An analog-digital converter comprising: comparators that compare a voltage value of an analog signal with a reference signal; counters that count a count value at a time point of a comparison process of a corresponding comparator; a voltage value storage that stores as a maximum voltage value a voltage value which is greater by a predetermined voltage than the voltage value of the analog signal having the maximum voltage value among analog signals converted into digital signals at a previous time and stores as a minimum voltage value a voltage value which is smaller by a predetermined voltage than the voltage value of the analog signal having the minimum voltage value among the analog signals converted into the digital signals at the previous time; and a reference signal generator that generates a down-count reference signal having as an initial voltage value the maximum voltage value stored in the voltage value storage or generates an up-count reference signal having as an initial voltage value the minimum voltage value stored in the voltage value storage.