Patent ID: 6131074
Filing Date: 2000-10-10
Classification: G01R

Abstract:
A calibration apparatus for a programmable comparator which compares an analog voltage value corresponding to a supplied digital code and the voltage value corresponding to an electric current value of an electric current supplied by a predetermined power supply point, provided with:a power supply means which supplies electric current of an indicated electric current value to said power supply point;an electric current detection means which converts the electric current value of an electric current flowing through said power supply point to a voltage value, and outputs the same to said programmable comparator;a calculation means which generates an electric current for each supplied current value of ""0"" and pre-determined electric current value other than ""0"" in said power supply means, calculates the digital code which generates the result of said comparison that shows agreement with both of said voltage values as the actually measured digital code for each of said supplied current values, and calculates code correction data from the ideal characteristics between the supplied current value and the digital code, and each of said supplied current values and each of said actually measured digital codes corresponding to them; anda correction means which corrects the digital code supplied to said programmable comparator based on said calculated code correction data.