[time-nuts] Re: thermodynamics of time keeping

[Bob kb8tq]

Hi

The reason for “unbuffered” is that there’s one less “block” in the device. That means
less delay. Delay in an oscillator stage is phase shift and it “tunes” the oscillator. If
it gets to far, the oscillator may have startup issues. Even if it’s in a tolerable range, 
twice the delay is twice the tuning due to gate issues ( voltage. temperature, whatever ….)

The classic gate (of any sort) is a low impedance out / high(er) impedance in design. 
By picking this or that combination of capacitors a very low gate “stage gain” might 
work. ( you get voltage gain when you do an impedance transform).

With a Schmidt (however you spell it) trigger not having a stable active region, it is a 
bit unclear just how you would bias it to get the oscillator to start…..

Bob

> On Sep 7, 2021, at 5:24 PM, Hal Murray <halmurray+timenuts at sonic.net> wrote:
> 
> 
> phk at phk.freebsd.dk said:
>> But putting multiple '04 inverters in sequence was a well known method to
>> shapen flanks, and I have always understood that as the reason for using
>> three in the xtal clock generator setup. 
> 
> They used to make a 74U04, U for Unbuffered, basically a simple analog 
> amplifier.  The target market was crystal oscillators.
> 
> Why would some people want low gain while others are going for high gain?
> 
> Is there a bogus urban legend involved, or were there 2 different market 
> segments?
> 
> 
> -- 
> These are my opinions.  I hate spam.
> 
> 
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