Current / voltage conversion circuit composed of μA741

Published:2011/7/6 8:31:00 Author:Lucas | Keyword: Current conversion , voltage conversion | From:SeekIC

When it makes the current conversion with more than 100mA, you should pay attention on the wiring resistor. If the reference resistance is switched into lΩ or O.lΩ, the wiring cable resistance, base resistance of lead wire can not be ignored. For example, the base resistance is 0.lΩ, in order to control the conversion error in 0.1%, the total wiring resistance is 100μΩ. Also, you should pay attention to resistor heating problem. When the current is lA or more, the resistor will heat, then the temperature of resistor is increased. Due to the effect of temperature coefficient, the reference resistance change will cause conversion errors.



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