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TLC271cp opamp ( Noninverting)

Song Heon Jae
Prodigy 100 points

Technical Question2016.05.04.pdf

  • 0 in reply to Song Heon Jae
    TI__Guru* 93105 points

    Hi Song,

    The two photodiode circuits you show are not equivalent. The first one, although complex, is a traditional transimpedance amplifier application of a photodiode. It provided an output voltage that is inverted to relative to the input current The second circuit, which doesn't appear to be quite correct, is an attempt at a voltage amplifier. That circuit doesn't appear to be complete and really needs to be configured differently to function.

    I am providing a link to a TI/ Burr-Brown Applications Report that discuses photodiode applications. Figure 7 in the report shows two variations on a non-inverting photodiode amplifier. The circuit in 7B being the higher performance of the two:

    Follow the advice of the report and you should have good results.

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 100 points
    one question : above circuits noninverting ? right?
  • 0 in reply to Song Heon Jae
    TI__Guru* 93105 points

    Song,

    Your first circuit showing the transimpedance amplifier is inverting. The other, which is configured as a voltage amplifier, is non-inverting; but It doesn't appear to be a complete, workable circuit. The Application Bulletin Figure 7 circuits are non-inverting photodiode amplifiers.

    Regards, Thomas

    PA - Linear Applications Engineering

  • 0 in reply to Thomas Kuehl
    Prodigy 100 points
    In reply to Thomas Kuehl:
    Thank you very much. Actually, I try to make LUX METER MODULE circuit . However, it is to difficult. I want to know that op amp and potentiometer relation. Also, I want to konw how to calculate GAIN and CUT-OFF FREQUENCY . On the top of lefe sides picture is LUX METER MODULE CIRCUIT. So, I constantly try to calculate GAIN and CUT-OFF FREQUENCY . Really thank you .