Ideas on causes of excess noise in transimpedance pre-amp?

Thanks!!!!

That solved the excess noise problem! With a small resistor added to the output pin of each voltage regulator, the excess noise that peaked around 60 kHz is gone on both circuit board versions of the transimpedance amp. Now the output noise is at the Johnson noise limit of the feedback resistor until well past the 33 kHz signal frequency. It seems to beautifully match the theory.

Thanks for your suggestion and to everyone who contributed suggestions.

Bret Cannon

Congratulations - both to you, for digging out the good advice that did solve your problem, and to Phil Hobbes for identifying the noise source that did make the difference.

For anyone who really needs a quiet 5V regulator - try looking at 5V reference sources. They tend to be expensive, but some of them are remarkably quiet.