[time-nuts] 10 MHz -> 16 MHz clock multiplier

[Bruce Griffiths]

The optimum width of the injection pulse is equal to 1/2 the period of 
the output frequency of the injection locked oscillator.
In this case a pulse width of around 31.25ns

Bruce

paul swed wrote:
> Bruce is right about that fact. Thanks.
> Square up the 10 Mhz. Diff the leading edge (It actually doesn't matter)
> maybe 2-5pf cap and 300 ohm R to ground. Feed this into a transistor that
> is in the bottom end of a one transistor oscillator. There are actually
> several ways to inject. Think of a totem pole of 2 transistors.
> Use google and do a search and you will see what I am  talking about. There
> were some articles that the spread spectrum hams used that describe it.
>
> On Wed, Jan 2, 2013 at 2:48 PM, Bruce Griffiths
> <bruce.griffiths at xtra.co.nz>wrote:
>
>    
>> Since injection locking is possible when the ratio of the 2 frequencies
>> involved is a rational number, a 16 MHz oscillator can be directly
>> injection locked to a 10MHz signal without the need for dividers etc.
>>
>> Bruce
>>
>>
>> paul swed wrote:
>>
>>      
>>> Tom.
>>> OK the challenge simple. CD4046 16 MHz vco and div by 8 using a 2 Mhz ref.
>>> Thats pretty easy as they say.
>>> As an alternative and very easy 10 MHz div 2 2MHz X 4 X 2. This requires
>>> BPF but pretty easy also.
>>> Lastly an injection osc. 10 Mhz div to 2 Mhz differentiate and feed to a
>>> 16
>>> Mhz osc.
>>> Thats actually the easiest of the approaches.
>>> Regards
>>> Paul
>>>
>>>
>>> On Wed, Jan 2, 2013 at 1:54 PM, Tom Van Baak<tvb at leapsecond.com>   wrote:
>>>
>>>
>>>
>>>        
>>>> What's the simplest way to generate 16 MHz from 10 MHz? This will be for
>>>> clocking a microcontroller at 16 MHz given 10 MHz (Cs/Rb/GPSDO). Low
>>>> price
>>>> and low parts count is a goal; jitter is not a concern but absolute
>>>> long-term phase coherence is a must.
>>>>
>>>> The ICS525 (as in TAPR Clock-Block) is a good candidate but I was
>>>> wondering if there's something cheaper, less functional, and maybe not
>>>> SSOP. Any suggestions?
>>>>
>>>> Thanks,
>>>> /tvb
>>>>
>>>>
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