[time-nuts] Digital Mixing with a BeagleBone Black and D Flip Flop

Bob Camp kb8tq at n1k.org
Thu Oct 16 06:59:47 EDT 2014


Hi

I wonder what they are using for the “lpf / zero crossers” in that version.

Bob

On Oct 16, 2014, at 4:07 AM, Bruce Griffiths <bruce.griffiths at xtra.co.nz> wrote:

> http://trs-new.jpl.nasa.gov/dspace/bitstream/2014/36903/1/01-2617.pdf
> 
> among other things illustrates a modified approach to the offset generator by replacing the intermediate phase locked VCXO with a bandpass filter.
> 
> Bruce
> 
> 
> 
> On Thursday, October 16, 2014 1:03 PM, Bert Kehren via time-nuts <time-nuts at febo.com> wrote:
> 
> 
> 
> Take a look at Potato chips yes Potato I have used them with good  results  
>  Bert Kehren  
> 
> 330551715157      
> 
> 
> In a message dated 10/15/2014 6:44:47 P.M. Eastern Daylight Time,  
> kb8tq at n1k.org writes:
> 
> Hi
> 
> Most ECL families have more trouble with 1/F noise than  fast silicon 
> saturated logic. That makes them poor candidates for this sort of  thing. 
> 
> Bob
> 
> On Oct 15, 2014, at 9:13 AM, Gerhard Hoffmann  <dk4xp at arcor.de> wrote:
> 
>> Am 15.10.2014 um 11:29 schrieb Bruce  Griffiths:
>>> Typically a 74HC164 shift register has internal cycle  to cycle sampling 
> jitter of about 4ps or so when used as a mixer, a 74AC  device has about 
> 1/4 of this jitter or around 1ps. Faster CMOS devices have  even less internal 
> jitter.
>> 
>> Hi,
>> do you have any data  on MC100EP51 & friends? In the datasheet they seem 
> to claim
>> sth.  in the low ps also, which would be disappointing in comparison to 
> 74AC or  74LVC
>> 
>> regards,  Gerhard
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