| 摘要 |
PURPOSE:To correct distortion of an amplifier where the distortion exists by using one amplifier to drive an input and to generate an output including a distortion due to the leakage current at the inverting input, allowing the other amplifier to detect the leakage current at the inverting input by the input voltage and the inverted voltage and compensating the leakage current to the inverting input. CONSTITUTION:A noninverting amplifier means 3 whose voltage amplification factor is 1+(Rf/Rl), where Rf, Rl are resistors, and a voltage dividing means dividing the inverting input voltage into a ratio of R1/(R1+R2) in dividing the resistor Rl of the noninverting amplifier means 3 into resistors R1, R2, are provided. Further, an input voltage 1 of the noninverting amplifier means 3 and a voltage 5 obtained by the voltage dividing means are used to detect the leakage current 6 of the inverting input, and a current 9 of the leakaged current component 6 is compensated to the inverting input through a resistor R5 by a means 4.
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