| 摘要 |
PURPOSE:To reduce an offset error and a gain error by using an input for caligration and making corrections of actual read data properly. CONSTITUTION:A reference voltage Vref is used to compare the absolute value of an analog input voltage successively from the most significant digit bit. A differential amplifier A calculates and amplifies the difference between two inputs e1 and e2 supplied by operating switches S1-S8 selectively, and an output e0 is obtained by operating switches S9-S12 selectively. Sample holding circuits SH1 and SH2 sample and hold the output e0 of the differential amplifier A. A comparator CMP1 compares the output e0 of the differential amplifier A with the Vref supplied through switches S15 and S16. A control circuit CONT generates control signals necessary for respective parts while considering the output state of the cmparator CMP. |
