[SI-LIST] [Fwd: Resistor noise specs]

From: Paul Levin <levinpa@xxxxxxxxxxxxx>
To: "Reflector, SI-List" <si-list@xxxxxxxxxxxxx>
Date: Mon, 17 Dec 2001 10:18:07 -0800
Sorry,

I hit the wrong button; I meant to distribute this to everyone.

Regards,

Paul Levin


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Date: Mon, 17 Dec 2001 09:42:36 -0800
From: Paul Levin <levinpa@xxxxxxxxxxxxx>
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To: Mathieu.Melenhorst@xxxxxxxxxxxx
Subject: Re: [SI-LIST] Resistor noise specs
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Mathieu,

This noise is an excess noise, probably per decade. This extra 1/f noise is
only present when there is a dc drop across the resistor. Motchenbacher
and Connelly's "Low Noise Electronic Design" (Wiley, 1993) attributes
this excess noise to manufacturing defects or process that resemble defects
(e.g., carbon composition resistors.)

This phenomena has be known since at least 1961 when MIL-STD-202,
Method 308 described a test for this excess noise.

Hope that this helps,

Paul Levin
Senior Principal Engineer
Logic Innovations
_____________________

"Melenhorst, Mathieu" wrote:

> Hi,
>
> When I looked at the specs of an RC02 resistor, the noise is specified as
> max 1 uV/V for 100E < R <= 1kOhms
>
> It seems that this is an absolute value, regardless of the bandwidth which
> is
> included in the thermal noise.
>
> Is there an explanation to be found in physics?
>
> Can anyone explain this?
>
> Mathieu Melenhorst
>
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[SI-LIST] [Fwd: Resistor noise specs]

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