| 摘要 |
PROBLEM TO BE SOLVED: To implement a low cost differential amplification circuit having low power and low offset voltage characteristics.SOLUTION: A differential amplifier includes an amplified signal output section 101, a detection section 102 for detecting an offset voltage, and a control section 103, and the amplified signal output section includes a plurality (even number) of amplifiers, and switches for dividing them into a positive side and a negative side. The control section selects a plurality of combinations in which there are the same number of the even number of amplifiers on the positive side and on the negative side, sequentially turns over the switches according to each combination via a control signal, and determines and maintains the combination of switches which minimizes the offset voltage detected by the detection section. |
