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shunt resistor like current sensor

Question asked by angel9009 on Nov 16, 2012
Latest reply on Nov 29, 2012 by hmani
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Hi hmani

 

The figure below is my circuit

It is fine?

I only connected the AGND (triangle figure) whit DGND (3 pads figure) througth the ferrite, voltage attenuation my net is fine, but my current net

   

the voltage across the shunt resistor mismatch placing a known load

example: I put a load that consumes 3.2 amps and the voltage drops in shunt resistance is 90mVm,

the votaje should be v = 3.2A = 16mV 5moh *.

 

 

why is this happening?

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