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

Bob Camp kb8tq at n1k.org
Wed Oct 15 22:27:10 EDT 2014


Hi

Is it silicon or is it something more exotic? In general, exotic is not good for 1/F noise.

Bob

On Oct 15, 2014, at 9:36 PM, Daniel Mendes <dmendesf at gmail.com> wrote:

> 
> You beat me :)
> 
> http://www.potatosemi.com/
> 
> They  sell low quantities thru Ebay, like this:
> 
> http://www.ebay.com/itm/7400-G-Series-GHz-TTL-CMOS-logic-IC-14pin-SOIC-QTY-1-/330772425575?pt=LH_DefaultDomain_0&hash=item4d0392ab67
> 
> Daniel
> 
> On 15/10/2014 21:02, Bert Kehren via time-nuts 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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