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Optical isolation device transmission linearity improving ci

2017-03-14 06:54  
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Optical isolation device transmission linearity improving circuit diagram
It uses negative feedback techniquesto greatly improve the transmission photocoupler linearity. In figure (a), D1 is in the feedback path, the current flowing D1 has the linear relationship with Vi. The disadvantage of this circuit is not taken into account the non-linear relationship between the current transfer ratio of optocoupler devices and operating current. Therefore, the deviced must be carefully selected.