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'[EE] Generating Nano-Scale AC voltages'
2011\03\10@084531 by Yigit Turgut

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Hi everyone,

For some boring reasons, I need to have 10^-9 AC Volts (nV) on my
desktop and I am seeking ideas for implementation. I would prefer to
do the trick with a few analog components and seems like it can be
done so but once implemented I doubt the precision will occur since
any environmental effect (thermal, emi etc) will be able to effect the
output very easily. The circuit can run from any kind of source and
frequency is can vary between 1-100 Hz.

I would like to hear your approaches on this.

Have a nice day

2011\03\10@091609 by Olin Lathrop

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part 1 375 bytes content-type:text/plain; charset="iso-8859-1" (decoded quoted-printable)

Yigit Turgut wrote:
> For some boring reasons, I need to have 10^-9 AC Volts (nV) on my
> desktop and I am seeking ideas for implementation.
> ...
> The circuit can run from any kind of source and
> frequency is can vary between 1-100 Hz.

Look up something called a "resistor divider".  See attached.


part 2 14940 bytes content-type:image/gif; name="b.gif" (decode)


part 3 181 bytes content-type:text/plain; name="ATT00001.txt"
(decoded base64)

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2011\03\10@091826 by Ing. Marcelo Fornaso

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It can be a difficult endeavor.

At 25 Celsius degrees, with a 100 Hz bandwidth, over a 50 Ohm resistance your thermal noise will be around 9 nanovolts RMS.

Good luck.

Marcelo Fornaso



________________________________
From: Yigit Turgut <spam_OUTy.turgutTakeThisOuTspamgmail.com>
To: Microcontroller discussion list - Public. <.....piclistKILLspamspam@spam@mit.edu>
Sent: Thu, March 10, 2011 10:45:31 AM
Subject: [EE] Generating Nano-Scale AC voltages

Hi everyone,

For some boring reasons, I need to have 10^-9 AC Volts (nV) on my
desktop and I am seeking ideas for implementation. I would prefer to
do the trick with a few analog components and seems like it can be
done so but once implemented I doubt the precision will occur since
any environmental effect (thermal, emi etc) will be able to effect the
output very easily. The circuit can run from any kind of source and
frequency is can vary between 1-100 Hz.

I would like to hear your approaches on this.

Have a nice day

2011\03\10@094550 by Bento, Joseph (Electronic Communications Tech) n/a

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face

-----Original Message-----
From: piclist-bouncesspamKILLspammit.edu [.....piclist-bouncesKILLspamspam.....mit.edu] On Behalf Of Olin Lathrop
Sent: Thursday, March 10, 2011 7:16 AM
To: Microcontroller discussion list - Public.
Subject: Re: [EE] Generating Nano-Scale AC voltages

Yigit Turgut wrote:
> For some boring reasons, I need to have 10^-9 AC Volts (nV) on my
> desktop and I am seeking ideas for implementation.
> ...
> The circuit can run from any kind of source and frequency is can vary
> between 1-100 Hz.

Look up something called a "resistor divider".  See attached.


While there is no problem with your circuit, I would advise caution if connected directly to the line, observing polarity where the low side is connected to neutral and the hot side connected to the 1meg resistor.  Ideally, perhaps, use a transformer and adjust the resistors accordingly.

Joe

2011\03\10@103321 by Yigit Turgut

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On Thu, Mar 10, 2011 at 4:45 PM, Bento, Joseph (Electronic
Communications Tech) <EraseMEJBentospam_OUTspamTakeThisOuTrideuta.com> wrote:
>
> {Original Message removed}

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