| 摘要 |
PURPOSE:To dispense with the adjustment of output offset voltage, by mounting a means for automatically compensating the input conversion offset voltage of an operational amplifier and excluding the effect thereof in output. CONSTITUTION:Differential amplification is achieved by applying voltages obtained at non-equilibrium detection terminals 7, 8 of a bridge circuit 100 to condensers 51, 52 in different timings so that both voltages come to alternately reverse polarities. Further, because the charging to condensers 51, 52 is performed in such a state that input conversion offset voltage is subtracted, only charge quantity accurately corresponding to a signal component is transmitted to a condenser 53 and it is eliminated that input conversion offset voltage is mixed in the signal component and amplified. Therefore, the adjustment of output offset voltage becomes unnecessary and the number of assembling adjusting processes are reduced. |
