Path: csiph.com!weretis.net!feeder6.news.weretis.net!news.glorb.com!peer01.iad!feed-me.highwinds-media.com!news.highwinds-media.com!spln!extra.newsguy.com!newsp.newsguy.com!drn From: Winfield Hill Newsgroups: sci.electronics.design Subject: Re: Combating Zener Jitter Date: 27 May 2017 19:15:52 -0700 Organization: Rowland Institute Lines: 34 Message-ID: References: NNTP-Posting-Host: pf066ae5a489d22b91b431af85a08988cead6e187d32de7a9.newsdawg.com User-Agent: Direct Read News 5.60 X-Received-Bytes: 1680 X-Received-Body-CRC: 1477557681 Xref: csiph.com sci.electronics.design:462035 Tom Del Rosso wrote... > >Winfield Hill wrote: >> Cursitor Doom wrote... >>> >>> Jim Thompson wrote: >>> >>>> AKA Flicker Noise >>> >>> Yup, pink noise. No jittering/jitterbugging involved. ;) >> >> Actually, I'd say you're wrong. The zener noise that we >> see in avalanche mode (greater then 7 volts or so) is due >> to step-wise "microplasma" ns-scale changes in current. >> A decade or so ago we fully discussed it here on s.e.d., >> complete with measurements, waveforms, detailed physics >> paper references and the works. Nailed it down. As it >> happens, the jitterbug analogy isn't so far off. >> >> This avalanche jitterbug noise source is not available >> in the low-voltage field emission zener operating mode, >> so using two sub-6-volt zeners in series in place of a >> higher-voltage zener, or any of many other good schemes >> would indeed be a good idea. > > Is the low-voltage noise less than half, so it > won't add up to more? Yes, it's a tiny fraction. Try it. -- Thanks, - Win