> 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) >
What range does it need to tune over? The whole 12-18, or some smaller section? You could use a fixed oscillator, multiply it up, and then mix the output of a DDS, perhaps also multiplied. 1 GHz works nice as a clock to a DDS, and as a basis for the "fixed" part. _______________________________________________ time-nuts mailing list -- [email protected] To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.
