| 摘要 |
A digital correction circuit calculates AD conversion errors EA and EA′in AD conversion stages subsequent to a target stage of AD conversion. EA is an error between an AD conversion result when a digital output of the target stage is set to 0, and an AD conversion result when it is set to +1 in a state where a higher reference voltage is input to the target stage. EB is an error between an AD conversion result when the digital output is set to 0, and an AD conversion result when it is set to−1 in a state where a lower reference voltage is input to the target stage. The digital correction circuit adds a correcting value of the target stage to the digital output. The correcting value is−(EA+EB)/2 when the digital output is−1,−(EA−EB)/2 when it is 0, and +(EA+EB)/2 when it is +1.
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