| 摘要 |
PURPOSE: A method and an apparatus for removing an error of an A/D converter are provided to simplify a structure of a circuit by using only an A/D converter. CONSTITUTION: A signal having an arbitrary frequency is generated by using an oscillator. A process for sampling and holding a waveform signal is performed in an oscillating process. An original signal is added to the signal after the sampling process and the holding process are performed. A voltage signal of the adding process is converted to a digital signal by using an ADC1. The voltage signal is converted to the digital signal by using an ADC2. A subtraction process is performed to obtain a difference between the digital signals.
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