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High frequency photodiode transimpedance amplifier design

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ConnerP:
Hello everyone, thanks for all of the feedback on this topic! I was quite busy the past month and didn't have time to revisit this topic until now. I've taken your inputs into consideration and made another attempt using the OPA818 followed by a secondary voltage gain stage. To achieve the precise small Cf value, I used a capacitance T network as described in the OPA818 sheet. So far as I can tell, this looks to check all the boxes, including stability, even if the parts are a bit pricey (after multiplying by 4 channels). Would y'all mind providing a second round of feedback?

I've included the stability simulation for just the OPA818 and the overall amplitude/phase response of the complete circuit with secondary gain stage. In the stability simulation green is open loop gain, blue is loop gain, and red is the combined response.

 OPA818_stability_test.asc (2.41 kB - downloaded 109 times.) OPA818_with_secondary.asc (2.99 kB - downloaded 69 times.)

jonroger:
I highly recommend using the Analog Devices design wizard:

https://tools.analog.com/en/photodiode/

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