| 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:Because the charging to condensers 51, 52 and that to a condenser 54 are performed in a manner setting off the input conversion offset voltages of operational amplifiers 50, 60, only charge quantity accurately corresponding to a signal component is transmitted to condensers 53, 55 and it is eliminated that input conversion offset voltage is mixed in a signal component and amplified and the input conversion offset voltage comes to one having a property capable of being sufficiently permitting without adjustment. Therefore, the adjustment of output offset voltage becomes unnecessary and the number of assembling adjusting processes can be reduced. |
