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LMH6629: TIA Design with this Op-Amp

Ratul Kundu
Prodigy 20 points
Part Number: LMH6629

Tool/software:

Hello, I designed a TIA Circuit with 80dB gain with LMH6629 op-amp. But, I see oscillations at the output in the PCB at the output. Can anyone tell ne what can be the reason? Is it a circuit design issue or PCB design issue?

  • 0
    TI__Intellectual 2490 points

    Hi Ratul,

    While testing what photodiode you used. Can you tell the paracitic capacitance or model of the photodiode?

    Please note that this device is not a unity gain stable, so you need to consider the paracitic capacitance of the photodiode while checking for stability and accordingly you have to put proper feedback capacitance to make it stable..

    Regards

    Anant

  • 0 in reply to Anant Sinha
    Prodigy 20 points

    I won''t use it for photodiode application. I will use it with a resonator. I can think of it as roughly 20pF.