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OPA317: Voltage inversion using Single supply Op amp Circuits

Part Number: OPA317
Other Parts Discussed in Thread: TINA-TI


I am using OPA317 for

     *  Negative to positive voltage conversion (using 5V supply for opamp)

     * Positive to Negative voltage conversion (using -5V supply for opamp)

Attached is the circuit. Please review and let me know whether this configuration is OK.

  • Anil,

    Your top circuit will not work - you need to add an input resistor to place the amplifier in an inverting configuration - see below.

    Keep in mind that since the linear output range of OPA317is defined within 100mV of either rail (see table below), in order for the circuit to operate properly the valid input range in the top circuit must be -4.9V to -0.1V while in bottom circuit 0.1V to 4.9V (output may never reach either rail).

    Below I have attached Tina-TI schematic for your own simulations.

    Anil OPA317 circuit.TSC

  • Thank you Marek for the detailed analysis and Simulation results.

    Margin on both side voltage railing is OK for my application.  

    In first circuit, resistor was missed when I did some edit in the original circuit to post here.  Will  keep that resistor.

    So going to use this circuit in  my  new design.

    Thanks & Regards,