| 摘要 |
PURPOSE:To attain a high correction accuracy and to offer ease of adjustment for the correcting characteristic by adopting the constitution such that a voltage dividing means dividing an analog voltage, a voltage divided by a voltage division means is fed to a reference voltage input terminal of an A/D converter and an analog voltage is fed to a conversion voltage input terminal of the A/D converter. CONSTITUTION:A resistor R is provided between an analog input terminal Vin and a reference voltage terminal +REF and a resistor Rr is provided to a reference voltage Vr input terminal before the resistor R in the voltage division circuit 2. Thus, a curved output is obtained with respect to an input voltage. Moreover, a buffer amplifier 3 neglects the fluctuation of the voltage division voltage Vref due to the correlation among the ladder resistor, R and Ra in the A/D converter 4. The resistors R, Rr are variable resistors, and in adjusting the value variously, the output is made close limitlessly to the required curve in principles. Finally, an input analog voltage Vi is converted into an analog voltage Vd by the cooperation between the voltage division circuit 2 and the A/D converter 4, the analog voltage Vd is converted into a digital data, which is given to a CRT display 5.
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