| 摘要 |
PURPOSE:To flow constant current to a load connected to the inverted input terminal of the 2nd operational amplifier by voltage-inverting and applying the output of the 1st operational amplifier to the uninverted input of the 2nd operational amplifier while applying the output of the 1st operational amplifier to the inverted input as it is, and then by the output of the 2nd amplifier to the inverted input of the 1st operation amplifier. CONSTITUTION:The output terminal of operational amplifier 10 is connected to the inverted input terminal of operational amplifier 10 by way of the 1st and 2nd resistances R1 and R2 and also connected to the uninverted input terminal of operational amplifier 20 via the 3rd and 4th resistances R3 and R4 for voltage division. While R1/R2=R3/R4, input voltage (ei) is applied to the uninverted input terminal of operational amplifier 10 and load RL is connected to the connection point of resistance R1 and R2, so that constant current is supplied to load RL. |
