| 摘要 |
PROBLEM TO BE SOLVED: To acquire a digital value with high conversion accuracy without performing calibration or the like on the digital value.SOLUTION: A time-lag digital converter comprises an FET switch 8 which is turned on during a period in which a conversion starting signal is inputted, a constant current source 9 which generates a constant current I/Nand extracts electric charges charging a capacitor 6 when the FET switch 8 is turned on, a comparator 10 which outputs a conversion ending signal when a ramp voltage Vof the capacitor 6 becomes equal to a ground potential, and a counter 12 which counts clock of a term Tduring a period from input of the conversion starting signal to the output of the conversion ending signal from the comparator 10. |
