Am 2022-01-09 1:21, schrieb Bruce Griffiths:
Yes, that post is full of misleading information.
The TI document is irrelevant as the PIC based divider doesn't have
non harmonically related signals using the same chip.
All internal signals within the PIC are harmonics of the divided output
Hi,
The traditional way is to lock an oscillator and look at the phase
detector output.
You get a high-pass filter from the locking, but for many purposes
that's just fine.
In some cases it is called "the golden PLL method".
Cheers,
Magnus
On 2022-01-09 18:04, Marek Doršic wrote:
Is
Is there any method to measure random jitter without TimePod or scopes costing
a small fortune?
.md
> On 9 Jan 2022, at 01:21, Bruce Griffiths wrote:
>
> Yes, that post is full of misleading information.
> The TI document is irrelevant as the PIC based divider doesn't have non
>
Hi Hal,
On 2022-01-07 21:40, Hal Murray wrote:
The two biggest outside influences on the PICDIV are supply voltage and
temperature.
Another interesting influence is the number of outputs that are switching and
the load on them. In particular, if you have several outputs running at
different
Yes, that post is full of misleading information.
The TI document is irrelevant as the PIC based divider doesn't have non
harmonically related signals using the same chip.
All internal signals within the PIC are harmonics of the divided output signal.
The post did not distinguish between random
Maybe it got mashed up, but I only linked to one post, and that
addressed the specific question that had been asked. There is also, as
far as I know, no 'misinformation' in it. However if anything does
need corrected, I can easily do that.
One of the main reasons that I did the test was all
Hi
Milk jugs full of water work pretty well for added thermal mass.
For some odd reason the typical fridge seems to be able to “accept”
a number of them …..
A small fan to keep the air moving and knock down gradient based
issues is a relatively cheap improvement.
Bob
> On Jan 8, 2022, at
Attila Kinali writes:
> Oh.. and if anyone is going to build a DIY oven for some instruments, a
> 55x35x30cm
> styrofoam box with 2cm wall thickness, suspended in air has a thermal
> resistance of
> approximately 3K/W. But beware that proper seating of the lid is quite
> critical as
>
Hi
There are a lot of different 78x05 devices out there and various outfits
pay more or less attention to the tempco on various die shrinks / redesigns.
You can see a *wide* range of temperature performance ( > 10:1) between
different examples from vendor A vs vendor B.
With any linear
Am 2022-01-08 10:55, schrieb Attila Kinali:
On Fri, 7 Jan 2022 12:32:10 +0100
Attila Kinali wrote:
stable (e.g. LTC6655 or use a Jung SuperRegulator that uses an
LM329/LM399 as reference).
Oops.. wrong chip... I meant the LT3042 low noise LDO here, not the
reference...
Sorry about that.
On Fri, 7 Jan 2022 19:05:58 -0800
Tom Van Baak wrote:
> Attila -- I have not measured the voltco. Note the T2-mini has an
> onboard regulator. I also have not measured tempco. Although the jitter
> is about 1 ps the wander over that 10 minute run is about ±6 ps (2.4 ps
> rms). Look at the
Would an « AVRDIV » have similar performances, with similar 8 pins processors
such as the Attiny13a ?
Advantage : it features one cycle instructions, so possible to divide by many
other factors (including odd numbers)
GC
> Le 8 janv. 2022 à 04:05, Tom Van Baak a écrit :
>
> All -- The 2012
On Fri, 7 Jan 2022 12:32:10 +0100
Attila Kinali wrote:
> stable (e.g. LTC6655 or use a Jung SuperRegulator that uses an LM329/LM399 as
> reference).
Oops.. wrong chip... I meant the LT3042 low noise LDO here, not the reference...
Sorry about that.
(Though the LTC6655 would work as LDO as
The PIC controllers have gone through a large number of iterations
and mask-shrinks over the years and your mileage may vary.
--
Poul-Henning Kamp | UNIX since Zilog Zeus 3.20
p...@freebsd.org | TCP/IP since RFC 956
FreeBSD committer | BSD since 4.3-tahoe
Never attribute
Tom
The voltage coefficient of delay for a 74AC04 is around -300ps/V so with a
tempco of -1.1mV/k for the output of a 7805 this results in an induced delay
tempco of around +0.33ps/K for the 74AC04 due to the voltage regulator tempco.
The typical propagation delay of the 74AC04 is around 4ns
All -- The 2012 test results for the T2-mini, which contains a PIC
divider chip, is here:
http://leapsecond.com/pic/jitter/
It's about 1 ps, or sqrt(2) less because it was comparing two T2-mini
against each other with a common reference. Also note that this
measurement is the sum total of
That entire thread is full of misinformation and should be ignored unless one
understands the difference between random and data dependent jitter.
For a well designed divider with a single output frequency only the random
jitter spec is significant.
One doesn't need a bunch of expensive
On Fri, 07 Jan 2022 12:40:49 -0800, you wrote:
>> The two biggest outside influences on the PICDIV are supply voltage and
>> temperature.
>
>Another interesting influence is the number of outputs that are switching and
>the load on them. In particular, if you have several outputs running at
> The two biggest outside influences on the PICDIV are supply voltage and
> temperature.
Another interesting influence is the number of outputs that are switching and
the load on them. In particular, if you have several outputs running at
different frequencies, the clock-out delay should be
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