[time-nuts] Low phase noise VCO
bruce.griffiths at xtra.co.nz
Wed Feb 10 00:51:45 UTC 2010
Nick Foster wrote:
>> From: bill at iaxs.net
>> To: time-nuts at febo.com
>> Date: Tue, 9 Feb 2010 18:24:39 -0600
>> Subject: Re: [time-nuts] Low phase noise VCO
>> Which leads me to ask a novice question:
>> Why not pull a 16 MHz crystal and multiply to 64 MHz?
>> If you count down from 64 to 10 MHz, isn't the multiplication inside the
>> Perhaps the noise is multiplied by 4, but would it work for the intended
>> Bill Hawkins
> Can you do x4 multipliers? I thought odd-order harmonics were usually used for multipliers. I'd be happy to be wrong!
Yes x4 multipliers aren't too difficult:
1) Cascade a pair of JFET doublers as Wenzel does.
2) Generate a narrow pulse with an SRD and select the required harmonic.
3) Use a single transistor multiplier like those used in the 5370A/B
10MHz to 200Mhz multiplier chain.
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