| 摘要 |
PURPOSE:To eliminate the effect of the offset voltage by giving the alternating switch between the input and output terminals of the operational amplifier with the 50% duty ratio. CONSTITUTION:In case switches 35b and 35a' plus 36b and 36c are kept on during time T1, the sum emerges at the output side between offset voltage Voff and output voltage Vout proportional to input voltage V<in>. While in case switches 35a and 35d plus 36a and 36d are kept on during time T2, voltage -Vin is applied to the input side to change the output voltage into Vout-Voff. Accordingly, if switches 35 and 36 are switched alternately, the mean output voltage is secured to reduce the effect of the offset voltage. |
