[time-nuts] algorithms and hardware for comparing clock pulses

[Jim Lux]

On 9/21/15 12:13 PM, Robert LaJeunesse wrote:
> The Teensy 3.1 (http://www.pjrc.com/store/teensy31.html ~$20) has a Flex Timer Module that appears to allow a single counter to be captured into independent registers from independent inputs. Not sure, but PJRC tends to run the clock fast (96MHz) so relative timing resolution should be much better than 0.1 microseconds.
>

I was looking at the discussion of the Flex Timer on the teensy forum..
One might want to be careful about the quality of the clock fed to those 
timers.  It's the regular old CPU clock, but it runs through a DPLL.
(e.g. the crystal is a 48 MHz crystal, and converted to either 72 or 96 
MHz as you select..)

I run my teensys at 48MHz, so I could hook up a 1pps to a pin and log 
some data pretty easily.  I suspect that the ADEV will be dominated by 
the CPU crystal, so I can use any convenient 1pps.



> Bob LaJeunesse
>
>> Sent: Monday, September 21, 2015 at 1:45 PM
>> From: "Can Altineller" <altineller at gmail.com>
>> To: "Discussion of precise time and frequency measurement" <time-nuts at febo.com>
>> Subject: [time-nuts] algorithms and hardware for comparing clock pulses
>>
>>     Dear Time-nuts,
>>
>>   ...
>>     I probably need a hardware to measure the time pulses more precisely.
>>   ...
>>     Are there any solutions to this problem?
>>   ...
>>     Best Regards,
>>     Can Altineller
>> _______________________________________________
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