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Ultra Low Noise Preamp, 40dB ,20Hz to 10Mhz

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DennisR:
I'm looking for a pre-build AC coupled 40db amplifier with very low noise. I would need a range between 20Hz to 10Mhz

I'd like to measure noise in the range of 100-500µV, but my oscilloscope noise floor is around 2mV.

The Picotest J2180A-20 looks promising, but in only has a 20dB gain. 
https://www.picotest.com/products_J2180A.html

David Hess:
100 to 500 microvolts RMS over 10 MHz is 32 to 158 nV/SqrtHz which is not particularly demanding, and *worse* than some old 200 MHz oscilloscopes.

A Preamble DA1855 or LeCroy DA1855A does more than you need and might be suitable if you can find one.  Differential operation raises input noise by 40%, but also adds common mode rejection which removes noise.

https://w140.com/tekwiki/wiki/Preamble_DA1855

sonpul:
If you described your tasks in more detail, perhaps someone will share their methods, experience and equipment used.


--- Quote ---I'd like to measure noise in the range of 100-500µV, but my oscilloscope noise floor is around 2mV.
--- End quote ---

But the J2180A costs as much as a few new oscilloscopes to suit you. Maybe it makes sense for you to buy one and there is no problem?

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