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RGC input stage of TIA?

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patriot

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The following figure is a TIA with RGC input stage. I want to know if the DC voltage of node A should be the same as output node? however, if the currents in R1 and I1 are not equal, there must be some voltage drop on Rf. How to avoide this?
 

Can anyone give some suggestion? how does it work at DC operation?
 

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