Extreme Low Noise Preamplifier 0,4 nV/Sqr(Hz) - diyAudio
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Old 18th May 2006, 08:00 AM   #1
Electrons are yellow and more is better!
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Default Extreme Low Noise Preamplifier 0,4 nV/Sqr(Hz)

http://www.beis.de/Elektronik/LNPreAmp/LNPreAmp.html

Have you seen this?

It's nothing new to use HF or RF transistors as low noise input transistors. Even Elektor had such a design many years back but this german has done a very good article about this.
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Old 18th May 2006, 08:36 AM   #2
AndrewT is offline AndrewT  Scotland
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Hi,
interesting and achieved way below (better than) his already good target.
Sounds like it will be worth following to see developments.
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Old 18th May 2006, 10:55 AM   #3
AndrewT is offline AndrewT  Scotland
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Hi folks,
any idea how to activate Uwe Beis' Email?
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Old 18th May 2006, 11:11 AM   #4
mzzj is offline mzzj  Finland
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Quote:
Originally posted by AndrewT
Hi folks,
any idea how to activate Uwe Beis' Email?

http://beis.de/Elektronik/EMail_Beis.html
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Old 18th May 2006, 11:42 AM   #5
AndrewT is offline AndrewT  Scotland
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Thanks Mzzj,
that link worked.
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Old 18th May 2006, 12:15 PM   #6
Electrons are yellow and more is better!
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I have read Uwe's directions for emailing and although this is a matter of course, something that is obvious, many people should think more about how the write messages to strangers. The least you can expect is a message signed by the name.

Compare the directions from Rod Elliott

http://sound.westhost.com/contact.htm
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Old 18th May 2006, 06:03 PM   #7
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The limitation of this design is the active noise injection from the current sources. Check it out.
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Old 19th May 2006, 08:29 AM   #8
Electrons are yellow and more is better!
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Do you mean the ZD zener at the input?
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Old 27th April 2010, 04:26 PM   #9
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T3, T5 and T6 sure contribute some noise, I can't tell off-hand though how large the contibution really is. With an undegenerated BJT input (not low-gmish JFET) second-stage contribution can usually be ignored.

Samuel
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Old 28th April 2010, 10:22 AM   #10
ontoaba is offline ontoaba  Indonesia
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He should use S/N ratio noise measurement, because input impedance differ the noise, in this kind circuit.
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