| 摘要 |
PURPOSE:To improve an input/output straight line characteristic even when the order of an input signal is small by correcting the amplification degree by an amplification degree correcting means provided with an arithmetic circuit only by the value reduced by the characteristic of a rectifying circuit beforehand. CONSTITUTION:A feedback impedance is composed of diodes D11 and D12 and a feedback resistance R12, and an operation amplifier M1 is composed of this and an input resistance R11 for an inverting amplifying device. At diodes D11 and D12, the element of the characteristic is respectively selected in which the forward direction voltage drop value is coincident to the forward direction voltage. When a since wave alternating current voltage is inputted to an input terminal 11, the voltage is inputted to an inverting amplifying device, the output voltage of the inverting amplifying device is half-wave-rectified by the diode D2, and the voltage drop value of the diodes D11 and D12 is canceled by the forward direction voltage value of the diode D2. The rectifying output of the diode D2 is smoothed by a resistance R1 and a capacitor C1, and integrated by an integrating circuit composed of a resistance R1 and a capacitor C2. Thus, the alternating current part included in the output signal is sufficiently removed.
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