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AD8626 voltage noise issue

Question asked by starraytheon on Dec 8, 2014
Latest reply on Dec 10, 2014 by krisf

Hi Experts,

 

I am testing a circuit that TIA pre-amp used AD8626.

 

I used Fig45 of spec page15 topology, and 2 OP are used.

 

I used same opto-diodes in the -INA and -INB inputs.

 

As I thought, the voltage noise of 2 OP should be same.

 

But the test shown the noises are different, how about is it?

 

Is the same bias circuit used for 2 OP core, the interference is generated?

 

Thanks for your support!

 

 

B&R

Tom

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