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Which is the cause of a negative offset the output of an AD620 with zero input and zero reference

Question asked by dancer on May 31, 2011
Latest reply on Jun 4, 2011 by delightman

which is the cause of a negative offset the output of an AD620 with zero input and zero reference, the circuit is show in the file attached. The problem is which the output of AD620 is aprox -0.5 V, with  0V of input and the reference at 0 V,  which cause, that the output  of the filter is zero while that the output of  AD620 is negative.

 

how is fix the problem?

 

Any suggestions.

 

Regards

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