Combating Zener Jitter

Has anyone got any suggestions as to how to best deal with the phenomenon 
of jittering zeners? Preferably without adding excessive complexity to a 
circuit, I mean.

1. More current. 

2. Switch to an LM329. (Bandgaps are much noisier.)

3. Filtering. 

Cheers

Phil Hobbs

> jittering zeners?

Noisy zener diodes ?
Avalanche effect >7V is much noisier than Zener <7V.
http://www.embeddedFORTH.de/temp/Z-noise.pdf
So it may help to replace a 10V zener by two stacked 4,7V.

MfG JRD

Am 21.05.2017 um 16:30 schrieb Rafael Deliano:
>> jittering zeners?
> 
> Noisy zener diodes ?
> Avalanche effect >7V is much noisier than Zener <7V.
> http://www.embeddedFORTH.de/temp/Z-noise.pdf
> So it may help to replace a 10V zener by two stacked 4,7V.

It gets even better for smaller voltages.

See
< 
https://www.flickr.com/photos/137684711@N07/24411798996/in/album-72157662535945536/ 
 >

for measurements on the NXP BZX84 - CxVy family.

Gerhard

On Sun, 21 May 2017 16:30:26 +0200, Rafael Deliano wrote:

>> jittering zeners?
> 
> Noisy zener diodes ?
> Avalanche effect >7V is much noisier than Zener <7V.
> http://www.embeddedFORTH.de/temp/Z-noise.pdf So it may help to replace a
> 10V zener by two stacked 4,7V.
> 
> MfG JRD

If you spot your zeners jittering, the key thing is to ACT FAST. Grab a 
pair of laundry tongs and place the zeners in a metal container (an old 
2oz St. Julian pipe tobacco tin is ideal) then bury it at midnight on the 
7th day of a waxing moon cycle. It's about the only thing that'll 
permanently kill 'em.
Seriously, there's no such thing as "jittering zeners" AFAIK - it's an 
urban myth.

On Sun, 21 May 2017 15:55:13 -0000 (UTC), Cursitor Doom
<curd@notformail.com> wrote:

>On Sun, 21 May 2017 16:30:26 +0200, Rafael Deliano wrote:
>
>>> jittering zeners?
>> 
>> Noisy zener diodes ?
>> Avalanche effect >7V is much noisier than Zener <7V.
>> http://www.embeddedFORTH.de/temp/Z-noise.pdf So it may help to replace a
>> 10V zener by two stacked 4,7V.
>> 
>> MfG JRD
>
>If you spot your zeners jittering, the key thing is to ACT FAST. Grab a 
>pair of laundry tongs and place the zeners in a metal container (an old 
>2oz St. Julian pipe tobacco tin is ideal) then bury it at midnight on the 
>7th day of a waxing moon cycle. It's about the only thing that'll 
>permanently kill 'em.
>Seriously, there's no such thing as "jittering zeners" AFAIK - it's an 
>urban myth.

AKA Flicker Noise
		
                                        ...Jim Thompson
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Take away their coffee.

Tim

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"Chris" <cbx@noreply.com> wrote in message 
news:ofrsc3$5em$2@dont-email.me...
> Has anyone got any suggestions as to how to best deal with the phenomenon
> of jittering zeners? Preferably without adding excessive complexity to a
> circuit, I mean. 

On Sun, 21 May 2017 09:03:18 -0700, Jim Thompson wrote:

> AKA Flicker Noise

Yup, pink noise. No jittering/jitterbugging involved. ;)

Chris wrote:

> Has anyone got any suggestions as to how to best deal with the phenomenon
> of jittering zeners? Preferably without adding excessive complexity to a
> circuit, I mean.
Best solution is not to use them in noise-sensitive applications.  The best 
I've seen, so far, is the LM4140.  If there isn't a version with the voltage 
you need, use an AD706, the only op-amp I've found with guaranteed 1/f 
speced out to 1/1000 Hz.

Jon

On Sun, 21 May 2017 11:29:37 -0500, "Tim Williams"
<tiwill@seventransistorlabs.com> wrote:

>Take away their coffee.

I was going to suggest Valium.