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Adding an offest in opamp

Pratham
Prodigy 20 points

Other Parts Discussed in Thread: OPA348

Hello,

I am not getting the offest I am expecting. The offest should be 1v and the output is having an offset of 2V.

Please find the simulation attached.

  • 0
    TI__Genius 15410 points

    Hello Pratham,

    The transfer function of the circuit is V3*(1+R1/R2) + VG1*(-R1/R2). Thus setting V3 to 1V will produce an offset of 3V on the output (1V*(1+2k/1k) = 3V). If you would like a 1V offset on the output, V3 should be set to 0.333V.

    Thank you,

    Tim Claycomb

  • 0
    TI__Genius 15410 points


    Hello Pratham,

    One other comment is that the OPA348 cannot be used with a 10V supply (+/-5V). The maximum supply voltage that the OPA348 is specified at is 5.5V (+/-2.75V). So you could use a single 5V supply or a dual supply of +/-2.5V. Please watch our TI Precision Lab videos on Input and Output Limitations for more information.

    Thank you,

    Tim Claycomb