[time-nuts] NIST frequency doubler
Dick, W1KSZ
w1ksz at earthlink.net
Mon Jul 9 23:42:23 UTC 2007
Where does one find this circuit ?
Thanks, Dick, W1KSZ
SAIDJACK at aol.com wrote:
>
> In a message dated 7/9/2007 01:59:46 Pacific Daylight Time,
> bruce.griffiths at xtra.co.nz writes:
>
>> It just an RF bypass capacitor to ground.
>> This circuit was embedded in a very small section of a much larger
>> paper, so its difficult to find.
>> You may even have read the paper and not have noticed the mixer circuit.
>> The resistor from the centre tap to ground is selected so that the peak
>> drain current is around 28mA or so when the RF is applied
>
>> RF input ~ 13dBm.
>> Input transformer 1:4 turns ratio (or thereabouts) centre tapped secondary.
>> Output transformer 2:1 turns ratio (or thereabouts).
>> RF bypass capacitor depends on input frequency typically 100nF or so.
>
>> Bruce
>
>
> Hi Bruce,
>
> nice circuit. Many questions:
>
> I wonder how well it works to get a 5MHz source up to 10MHz?
>
> Also, would you have recommendations on the transformer part numbers?
> (MiniCircuits, MaCom, etc)? I think the transformers are probably key to getting
> good phase noise (preventing them from saturating, crosstalk, etc).
>
> Do you have a suggestion on who makes the best (lowest-noise) JFets?
>
> Where could we find the original paper's PDF?
>
> Lastly, how much fundamental attenuation would you expect from such a
> circuit?
>
> Thanks!
> Said
>
>
>
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--
73, Dick, W1KSZ
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