| 摘要 |
PROBLEM TO BE SOLVED: To obtain a current/voltage conversion circuit having a large dynamic range and exhibiting high accuracy and resolution even for a current varying at a high rate. SOLUTION: In a circuit provided with a current bypass passage by proving I/V conversion resistors for current/voltage conversion in series in the order of resistance for required number of ranges such that each I/V conversion resistor can be turned on/off by a switching element, a current is bypassed for the I/V conversion resistor passing a current lower than a range when a current exceeding a set level in that range flows through that I/V conversion resistor and the current of the I/V conversion resistor lower than that range is brought to a rated level or below. Voltage across each I/V conversion resistor is detected by means of a differential amplifier and then operated through an operating circuit thus detecting the current level. COPYRIGHT: (C)2005,JPO&NCIPI
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