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Need amplifier with a negative DC offset.

John Reuteman
Prodigy 10 points
Other Parts Discussed in Thread: INA826

I have an application where my accelerometer sensor outputs a differential signal, +/- 4VDC, but my data acquisition system requires a differential +/-5 vdc signal but in the range of -4 vdc to -14 vdc. Does anyone know of a device or circuit that can amplify the signal from +/- 4 vdc to +/- 5 vdc then give it a -9 vdc DC offset. Power available at the sensor is +24 VDC. Power available at the data acquisition system is +/- 23 VDC.

  • 0
    TI__Guru* 93105 points

    Hi John,

    You should be able to amplify the +/-4 Vdc signal to +/-5 Vdc and offset it by -9 V by using an INA826 instrumentation amplifier. The gain set resistor is selected for a voltage gain of 1.25 V/V. The -9 V output offset is achieved by applying an external -9 V reference voltage to the INA826 REF pin. That could be derived from the -23 V power using a -9 V reference source. The +/-23 V supply is too high for the INA826 so it is recommended to add +/-15 V linear regulators to the supply lines.

    Here a simplified schematic for the INA826 circuit:

    I hope this helps.

    Regards, Thomas

    PA - Linear Applications Engineering