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Differential to single ended conversion with high CMRR

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Sudeep Banerji

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Hi guys,

I have a differential current output from one stage of a design and I want to convert it into a single ended voltage output. I need a very good CMRR which I lose out on due to conversion into single ended output. Is there any way to maximize CMRR and get a single ended output as well? I do not want to introduce and gain error either so I'm not keen on mirroring the currents. Any insight would be appreciated. Thanks!
 

KlausST

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Hi,

Did you recognise that there is no single value in your post?

But we need informations like current range, supply voltage range, CMVoltage range, frequencies, acceptable errors...to find an appropriate solution.
Also your schematic is very important

Klaus
 

FvM

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It's also not completely clear what "differential current" means for you and how it will be sensed, can be e.g. dual ground refernced current sink, truely floating differential current sink, etc. But a schematic including the current source should clarify.
 

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