| 摘要 |
PROBLEM TO BE SOLVED: To provide a method of calibrating an evaluation circuit and an evaluation circuit. SOLUTION: This method includes a step for disconnecting a feedback branch of the evaluation circuit, a step for impressing an AC voltage on the input side of a transconductance amplifier, a step for finding an output voltage impressed on the output side of a voltage amplifier, a step for adjusting the amplification coefficient of the transconductance amplifier to a value selected so that the output voltage impressed on the output side of the voltage amplifier has a minimum amplitude, and a step for closing the feedback branch of the evaluation circuit. In the evaluation circuit, a switch for disconnecting the feedback branch is provided in the feedback branch of the transconductance amplifier. The input side of the transconductance amplifier can be connected to an AC voltage source while the output side of the voltage amplifier can be connected to a voltage measuring instrument. COPYRIGHT: (C)2011,JPO&INPIT
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