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-boun...@febo.com [mailto:time-nuts-boun...@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. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there. _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
