[time-nuts] fast freq. synthesis schemes

[Bob Camp]

Hi

At least on paper you can run a DDS at VHF/UHF and put it into a (very)
wideband PLL driving a 12-18 GHz VCO.

As mentioned previously - spurs will be an issue. You also will need to get
a hold of some DDS chips with GHz-ish clock rates. 

Bob

-----Original Message-----
From: time-nuts-bounces at febo.com [mailto:time-nuts-bounces at febo.com] On
Behalf Of Luis Cupido
Sent: Wednesday, October 14, 2009 3:25 PM
To: Discussion of precise time and frequency measurement
Subject: [time-nuts] fast freq. synthesis schemes

Hi,

I'm looking for the schemes used on the
frequency synthesizers that change frequency
in few microseconds time (or less)
at microwaves lets say circa 12-18Ghz)
Obviously with some resolution (let's say 100Khz step
or in that order)(otherwise it would
be a trivial exercise in the BW of the PLL loop filter)

Does anyone know of some paper or tech notes from
some instrument or modules that show block diagrams
of such?

I have many info on mw synthesizers but all fall into
microwave radio style of things with much higher
resolution (khz and less) and much longer
switching times (millisencods or more).
Info on fast stuff I can't really find.


I'm thinking of experimenting on something along those
lines so... all comments are welcome.

Thanks.

Luis Cupido.
ct1dmk.

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