| 摘要 |
<p>A storage section (101) stores a digital value. A compensation section (102) controls the offset voltage of an amplifier circuit (2) depending on the digital value stored in the storage section (101). A judgment section (103) judges the high-low relation between the voltage value of an output signal (S2) from the amplifier circuit (2) and a reference voltage value. An adjustment section (104), if the number of judgments that the voltage value of the output signal is higher than the reference voltage value is more than the number of judgments that the voltage value of the output signal is lower than the reference voltage value out of the results of the k number of judgments by the judgment section (103), adds a positive value to the digital value of the storage section (101). On the other hand, the adjustment section (104), if the number of judgments that the voltage value of the output signal is lower than the reference voltage value is more than the number of judgments that the voltage value of the output signal is higher than the reference voltage value, adds a negative value to the to the digital value thereof.</p> |
