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Originally Posted by: Russ White  I do agree that lower value resistors will get you a (albeit very small) reduction in noise ... In fact three times less noise than original design, which is not small at all.
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That's the other end of the problem. Each change also has a consequence - a change that lowers noise can also lower bandwidth and raise output impedance. :)
LEDs are a nice reference, but also have some undesirable characteristics too - notably large tempco and impedance.
All in all I am pleased with it as designed - but I am also happy to see people tinkering with it.
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What options should I implement considering OPA(2)209 is already soldered in? I do not have an instrumental noise amplifier to make measurements myself...
Options:
1. Do nothing
2. Replace R1 with 100R and R2 with 130R
3. Increased compensation capacitors from 100pF to 870pF. (Which Cx?!?)
4. Increases CSS. (Which parts & values?)
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