[time-nuts] NIST frequency doubler

Dr Bruce Griffiths bruce.griffiths at xtra.co.nz
Tue Jul 10 00:40:43 EDT 2007


SAIDJACK at aol.com wrote:
> ); SAEximRunCond expanded to false
> Errors-To: time-nuts-bounces+bruce.griffiths=xtra.co.nz+bruce.griffiths=xtra.co.nz at febo.com
>
>  
> In a message dated 7/9/2007 18:34:30 Pacific Daylight Time,  
> bruce.griffiths at xtra.co.nz writes:
>
>   
>> Since JFETS have a relatively large spread in characteristics  individual 
>> adjustments are  required.
>>     
>
>   
>> Bruce
>>     
>
>
>
> Thanks again Bruce,
>  
> I am not a big fan of Jfets... Prefer Mosfets or Bipolars..
>  
> There are some ultra-low-noise Audio Jfets such as the dual LSK389:
>  
> _http://www.linearsystems.com/products.html#GlossD_ 
> (http://www.linearsystems.com/products.html#GlossD) 
>  
> I wonder if these work well at 5/10MHz...
>  
> bye,
> Said
>
>
>   
Said

Probably not as they tend to have relatively large gate source 
capacitances especially the lower noise ones.
MOSFETS tend to have excessive flicker noise for this application.

Bruce




More information about the time-nuts mailing list