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trans impedance photodetector with 5 MHz bandwidth

Pete Arslanian
Prodigy 110 points
Other Parts Discussed in Thread: OPA827, THS4631

Well I am still in the designing phases of my earlier post concerning this topic. My circuit design is bound by the fact that I can operate only from a +- 15VDC power supply. Can anyone suggest  a good  op-amp with a GBP of at least 20 MHz and one with a GBP of at least 200 MHz.

Pete

  • 0
    TI__Guru* 93105 points

    Hi Pete,

    I suggest taking a look at the OPA827 operational amplifier for your 20 MHz GBP requirement. It will operate with the +/-15 volt supplies and because of its JFET inputs and low noise it should work well in your TIA application. You can find the data sheet here:

    http://www.ti.com/lit/ds/symlink/opa827.pdf

    See the Transimpedance Amplifier section on page 16.

    Operational amplifiers having a GBP greater than 200 MHz, and that will operate with +/-15 V supplies are actually supported by TI's High-Speed Amplifiers group. That said, I reviewed their amplifiers and found one that may meet your high-speed TIA requirements, the THS4631. You can view the data sheet here:

    http://www.ti.com/lit/ds/symlink/ths4631.pdf

    There is a thorough write-up about applying this amplifier in TIA applications starting on data sheet page 9. The High-Speed Amplifiers E2E forum would be able to assist you with your questions about this device and the application.

    Regards, Thomas

    PA - Linear Applications Engineering

     

  • 0 in reply to Thomas Kuehl
    Prodigy 110 points

    Thomas,

     Thank you for your reply,  have simulated my design with both of the recommended amps with good results to the 5MHz design spec. I will begin a new post on the high speed amplifiers section in order to pose some questions regarding the use of a bipolar op-amp in the gain stage in the hope of reducing the noise in my detection circuit. 

    Pete A

  • 0 in reply to Pete Arslanian
    TI__Guru* 93105 points

    Hi Pete,

    Thank you for the feedback on the amplifiers suggested for your TIA application. The High Speed Amplifiers group should be able to take it from here. If you need anything else, let us know.

    Regards, Thomas

    PA - Linear Applications Engineering