| 摘要 |
An A/D converter executes an A/D conversion of an inputted signal having a ramp waveform in response to a clock signal and sequentially stores digital output data into memories. In response to the clock signal, the storage data is read out from the memories. In a calculator, from certain data, data whose phase is delayed by one clock from such data is subtracted and a peak value of a subtraction value is detected by a peak detector. When the peak value lies within a range of ±1, it is determined that no glitch noise occurs. When the peak value exceeds the range of ±1, it is decided that the glitch noise has occurred.
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