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OPA855: OPA855 as a transimpedance amplifier

Brian Spielbusch
Prodigy 10 points
Part Number: OPA855

Tool/software:

I would like to use your OPA855 as a transimpedance amplifier for a 2.5GHz photo diode detector.

I need 2.5GHz bandwidth. Using your “Application Report SBOA122–November 2009” I should be able to get there.

I have a PCB built up, but a get a resonance at ~1.5GHz. 

Any suggestions.

 

I would also like to use the OPA855 as a transconductance amplifier for driving a laser diode to 2.5GHz.

  • 0
    TI__Mastermind 25175 points

    Hello Brian,

      Thank you for reviewing our application reports. Would you be able to share a schematic with us? And, would you be able to share the internal photodiode capacitance?

       Also, we have developed a tool for designing TIA circuits with photodiodes. You can modify multiple input parameters like output voltage range, diode current, selection of opamp, etc. At the output you can see transient + frequency response, noise analysis, etc. This is helpful for debugging via simulation.

        Tool link: Analog circuit design studio

    Best Regards,
    Sima