[time-nuts] 4046 variations (was EPE GPS....)

Ulrich Bangert df6jb at ulrich-bangert.de
Mon Sep 28 12:34:12 UTC 2009


in http://www.elektronik-kompendium.de/public/schaerer/pll4046.htm

which unfortunately is available in German language only (the illustrations
however speak for themselves!) the author makes an in depth analysis of the
"self biasing amplifier" circuitry of the 4046's input pin 14 and explains
the dos onts donts with this input. Apart from differences of the vco range
due to different cmos technologies most of the chip to chip differences seem
to have it's origin in this region.

Best regards
Ulrich Bangert


> I don't have all the things I would wish I had, lacking alot 
> of analog databooks.

Are you looking for something special? I have a number of old data books
that I did not use for at least 15 years, actually they are much older.

> -----Ursprungliche Nachricht-----
> Von: time-nuts-bounces at febo.com 
> [mailto:time-nuts-bounces at febo.com] Im Auftrag von Magnus Danielson
> Gesendet: Montag, 28. September 2009 00:38
> An: Discussion of precise time and frequency measurement
> Betreff: Re: [time-nuts] 4046 variations (was EPE GPS....)
> Jim,
> Lux, Jim (337C) wrote:
> > Design AND component...
> > 
> > Easy to claim heritage if all you do is change a resistor or a 
> > capacitor. Tougher to claim if you change the active components, 
> > particularly if it's functionally different (e.g. Substituting a 
> > 2n3904 for a 2n2222 isn't a huge deal.. Changing a NPN to a PNP and 
> > reversing bias, or using FETs instead of bipolars.. That would be a 
> > big deal)
> > 
> > Keeping those 30 year old databooks is important.. (as we tell the 
> > folks who
> > say: "why do you need all that shelf space.. Surely those 
> datasheets are
> > available on line")..  1980s design, modified in 1990s, 
> using parts first
> > available in 1970s, launched in 2000s, gets to Saturn in 
> 2010s, has inflight
> > anomaly.. 
> > 
> > Oddly, the 4000 series CMOS are still heavily used.  Back 
> in the 70s 
> > and 80s, I hated those parts because they were ESD 
> sensitive (compared 
> > to straight or LS ttl), but by today's standards, they're 
> rock solid, 
> > have huge junctions, work at any supply voltage.
> I have been a fan of keeping old databooks. Keeps collecting them.
> For instance, in practice my most used databook is the RCA 
> CMOS databook 
> from 1982. Contains some very useful insights into the 4046 
> design which 
> the online datasheet does not reveal.
> I don't have all the things I would wish I had, lacking alot 
> of analog 
> databooks.
> Cheers,
> Magnus
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