| 摘要 |
PURPOSE:To reduce the abberation of an output by connecting parallelly the constant voltage elements at return resistor and each input resistor when the adding operation amplifier is reversal type or by connecting the constant voltage elements at between both input terminals and ground. CONSTITUTION:When inputs V1 and V2 are added by reversal type operation amplifier OP, constant voltage element A1f is parallelly connected to return resistor Rf, and constant voltage elements Z1, Z2 are parallelly connected to each adding input resistor R1, R2. When inputs V1' and V2' are added by non- reversal type operation amplifier OP', constant voltage elements Zi and Zs are connected between both side terminals and ground. Relation between each input voltage V1, V2 and output voltage V0 in case of reversal type OP is shown as formula I. Here, when the resistors R1, Rs, Rf are corrected by constant voltage elements Z1, Z2, Zf, the abberation is corrected. Similarly, V0'=V1'+V2' is obtained resulting in the correction of the abberation. In such a way, the output level is limited, and the abberation of output level is reduced. |
