[time-nuts] crystal oscillators & TPLL

WarrenS warrensjmail-one at yahoo.com
Tue Jun 22 19:50:43 UTC 2010

Poul-Henning posted
>Yes, you probably did.  (Think it was obvious)

TRUE, it is obvious to me, but then I've had the advantage of being able to 
test the TPLL to find the answers to things that I did not understand at 

So is there some part that is not obvious to you?
Maybe someone from the group can help you with that part.
is it:

1) that the definition of ADEV that starts with the the intigral freq 
differences taken over a period of time called tau?
2) that Analog filters do not have dead time and includle all data with no 
dead time
3) a simple PLL can be repersented by nothing more than a first order RC 
over a very wide range
4) that RC's do not have delay, they have Time consrtants,
5) what the difference between between a RCs and delay is
6) that the purpose of doing zero deadtime period measurments is to try and 
duplicate the best they can of  intigrated Freq over tau
7) how the simple TPLL works
8) or how close the TPLL clones the ref osc to the DUT
9) why the Ref Osc's EFC is an analog signal of its Frequence
10) what the limits of accurcacy is of the reference osc's EFC
11) how to intigrate by oversampling
12) why no other Software is needed to process the Raw data of the TPLL
13) or why this group is called freq and time nuts
14) the best way to stop this thread
15) how to skip over anything with a TPLL in the subject
16) other TBD
16) why someone on this site resents be referred to as one of the "NUTs"
OK I'll admit, I don't understand that one myself, but I'm OK on the rest of 
the above obvious things.



[time-nuts] crystal oscillators & TPLL
Poul-Henning Kamp phk at phk.freebsd.dk
Tue Jun 22 18:55:00 UTC 2010

In message <0C4F750835264E13AB61D4B8C8448B68 at Warcon28Gz>, "WarrenS" 

>> you have a very tough row to hoe when it comes to proving
>> that your frequency samples represent the same signal as a sequence
>> of zero deadtime period measurements would do.
>Sorry, I though that was obvious.

Yes, you probably did.


Poul-Henning Kamp       | UNIX since Zilog Zeus 3.20
phk at FreeBSD.ORG         | TCP/IP since RFC 956
FreeBSD committer       | BSD since 4.3-tahoe
Never attribute to malice what can adequately be explained by incompetence. 

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