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<div class="moz-cite-prefix">On 07/21/2016 06:36 AM, Bill Cox wrote:<br>
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<blockquote
cite="mid:CAOLP8p6UVbDRXM6gjktyRV19pMEb_DGd=roHVhkd0MwPbwYskA@mail.gmail.com"
type="cite">
<div dir="ltr">I have not seen any papers on this, but I can tell
you that if you buy a regular zener diode, it will generate a
disappointingly low amount of noise, many times less than the
reverse breakdown Vbe of a cheap transistor. Apparently, zener
avalanche noise is highly dependent on the process used, and if
you tune the process to lessen avalanche noise, you can
eliminate most it.<br>
<div><br>
</div>
<div>Bill</div>
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</blockquote>
Something useful to note is that the noise goes up considerably for
higher-voltage Zeners, which is why almost all commercial noise
sources<br>
for RF use Zeners rated at about 20V, and run them at 28V.<br>
<br>
I use ordinary Zeners all the time (12V and higher) as RF noise
sources. They work well.<br>
<br>
<br>
<blockquote
cite="mid:CAOLP8p6UVbDRXM6gjktyRV19pMEb_DGd=roHVhkd0MwPbwYskA@mail.gmail.com"
type="cite">
<div class="gmail_extra"><br>
<div class="gmail_quote">On Wed, Jul 20, 2016 at 2:17 PM, Kurt
Roeckx <span dir="ltr"><<a moz-do-not-send="true"
href="mailto:kurt@roeckx.be" target="_blank">kurt@roeckx.be</a>></span>
wrote:<br>
<blockquote class="gmail_quote" style="margin:0 0 0
.8ex;border-left:1px #ccc solid;padding-left:1ex">Hi,<br>
<br>
I'm trying to understand the entropy generated by a reversed
diode<br>
in avalanche breakdown mode. Does anybody know of a paper
that<br>
describes it, maybe talk about the distribution of the
noise, the<br>
effect of temperature changes, RF interference?<br>
<br>
I'm trying to analyze the chaoskey.<br>
<br>
<br>
Kurt<br>
<br>
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