Hi The output spectrum of some DDS’s is pretty rich. You may find that a 1 GHz DDS can be filtered to operate directly over the 3.1 to 3.4 GHz.
Bob On Oct 7, 2014, at 7:36 PM, Jim Lux <jim...@earthlink.net> wrote: > On 10/7/14, 10:32 AM, Magnus Danielson wrote: >> You should be able to use DDS test-boards and by timing your last write, >> you should be able to time the frequency jump. >> >> The STEL-1173 takes 6 bytes, but writing the last one latches all 6 >> bytes over to a single 48 bit word. I expect that other DDSes have the >> same distinct transfer-phase if you only look in the datasheet for the >> details. >> > > Yes, virtually all of them have a "load" input of some form (I'm familiar > with the AD98xx and AD99xx ones, and they certainly do). > > What I'd really like, though is something at a slightly higher level of > integration (for which I am willing to pay.. it's a time vs money thing). > Does someone sell a DDS in a box with connectors, etc. > > I need a tuning range, for now, of around 3.1 to 3.4 GHz, so any of the "1 > GHz" DDSes can generate something that I could mix up with a 2.8-3 GHz LO > (which I have), although I'd have to be careful about images. > Or I can run the few hundred MHz out of the DDS into a doubler/tripler, then > mix up. > > > >> Some of the modern DDSes can take 10 MHz directly and step it up >> internally before hitting the DDS core, but it may be that you need to >> synthesize a higher clock from the 10 MHz first. > Not a problem, I think I have a 10 in to 100 MHz out set of bricks from > Wenzel (x5 and x2) from a previous project > > > _______________________________________________ > 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.