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INA317: INA317: Input Bias Current Return path

Jagbir
Expert 1515 points
Part Number: INA317

I have a question regarding the Input Bias Current Return path section (8.2.2.5) of the INA317 datasheet. My sensor( Strain gauge) is referenced to the same ground as INA317. I do not think that I need to add this resistor to my design.Please confirm.

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    TI__Genius 10850 points

    Hello Jagbir,

    Thanks for your post, I can help you. Since the sensor input is ground-referenced, you don’t necessarily need a resistor bias current return path since ground creates a complete path. The resistors at the input would only degrade performance by adding noise and lowering the input impedance of the circuit. 

    -Tamara