[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
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