Extreme Low Noise Preamplifier 0,4 nV/Sqr(Hz)

peranders · 18th May 2006, 08:00 AM

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.

AndrewT · 18th May 2006, 08:36 AM

Hi,
interesting and achieved way below (better than) his already good target.
Sounds like it will be worth following to see developments.

AndrewT · 18th May 2006, 10:55 AM

Hi folks,
any idea how to activate Uwe Beis' Email?

mzzj · 18th May 2006, 11:11 AM

Quote:

Originally posted by AndrewT
Hi folks,
any idea how to activate Uwe Beis' Email?

http://beis.de/Elektronik/EMail_Beis.html

AndrewT · 18th May 2006, 11:42 AM

Thanks Mzzj,
that link worked.

peranders · 18th May 2006, 12:15 PM

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

john curl · 18th May 2006, 06:03 PM

The limitation of this design is the active noise injection from the current sources. Check it out.

peranders · 19th May 2006, 08:29 AM

Do you mean the ZD zener at the input?

Samuel Groner · 27th April 2010, 04:26 PM

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

ontoaba · 28th April 2010, 10:22 AM

He should use S/N ratio noise measurement, because input impedance differ the noise, in this kind circuit.

18th May 2006, 08:00 AM	#1
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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. __________________ /Per-Anders (my first name) or P-A as my friends call me

18th May 2006, 08:36 AM	#2
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi, interesting and achieved way below (better than) his already good target. Sounds like it will be worth following to see developments. __________________ regards Andrew T.

18th May 2006, 10:55 AM	#3
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Hi folks, any idea how to activate Uwe Beis' Email? __________________ regards Andrew T.

18th May 2006, 11:42 AM	#5
AndrewT diyAudio Member Join Date: Jul 2004 Location: Scottish Borders	Thanks Mzzj, that link worked. __________________ regards Andrew T.

18th May 2006, 12:15 PM	#6
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	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 __________________ /Per-Anders (my first name) or P-A as my friends call me


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18th May 2006, 06:03 PM	#7
john curl diyAudio Member Join Date: Jul 2003 Location: berkeley ca	The limitation of this design is the active noise injection from the current sources. Check it out.

19th May 2006, 08:29 AM	#8
peranders Electrons are yellow and more is better! diyAudio Member Join Date: Apr 2002 Location: Göteborg, Sweden Blog Entries: 4	Do you mean the ZD zener at the input? __________________ /Per-Anders (my first name) or P-A as my friends call me

27th April 2010, 04:26 PM	#9
Samuel Groner diyAudio Member Join Date: Jun 2005 Location: Zürich	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

28th April 2010, 10:22 AM	#10
ontoaba diyAudio Member Join Date: Nov 2009 Location: Kudus, & Malang	He should use S/N ratio noise measurement, because input impedance differ the noise, in this kind circuit.

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