However it does discipline the DDS outputs as intended. It is somewhat akin to Ulrich's approach perhaps without the robust outlier rejection. This approach would allow a wide range of relatively stable low noise sources to be used including those that may have drifted out of adjustment range. One drawback for some applications is the relatively high phase noise floor.
Bruce Lester Veenstra wrote: > Sync to 1 pps but will not discipline the frequency source > > > Lester B Veenstra MØYCM K1YCM > [email protected] > [email protected] > [email protected] > > > US Postal Address: > PSC 45 Box 781 > APO AE 09468 USA > > UK Postal Address: > Dawn Cottage > Norwood, Harrogate > HG3 1SD, UK > > Telephones: > Office: +44-(0)1423-846-385 > Home: +44-(0)1943-880-963 > Guam Cell: +1-671-788-5654 > UK Cell: +44-(0)7716-298-224 > US Cell: +1-240-425-7335 > Jamaica: +1-876-352-7504 > > This e-mail and any documents attached hereto contain confidential or > privileged information. The information is intended to be for use only by > the individual or entity to whom they are addressed. If you are not the > intended recipient or the person responsible for delivering the e-mail to > the intended recipient, be aware that any disclosure, copying, distribution > or use of the contents of this e-mail or any documents attached hereto is > prohibited. > > -----Original Message----- > From: [email protected] [mailto:[email protected]] On > Behalf Of christopher hoover > Sent: Thursday, June 11, 2009 5:26 AM > To: [email protected] > Subject: [time-nuts] AD9548 - Clock IC Generates Up to 400 MHz from 1 PPSGPS > Signal > > > [fyi -- this may be of general interest, but n.b. that this A.D. > marketing - ch] > > > Clock IC Generates Up to 400 MHz from 1 PPS GPS Signal > > The AD9548 > <http://www.analog.com/en/clock-and-timing/clock-generation-and-distribution > /ad9548/products/product.html> > is the first clock chip in the industry to directly generate up to a 400 > MHz output clock, with extremely low phase noise, that is locked to a > standard one pulse-per-second (PPS) GPS clock signal. This performance > is a result of combining Analog Devices' proprietary direct digital > synthesis (DDS) technology with a state-of-the-art digital phase-locked > loop (DPLL). Other solutions for synchronizing to the GPS 1 PPS source > typically rely on one or more frequency upconversion steps. Maintaining > low output noise, while providing over eight orders of magnitude of > frequency scaling (1 Hz input to over 100 MHz output), is a significant > challenge. The AD9548 is able to mitigate this effect thanks to a > digital loop filter capable of bandwidths as low as 1 MHz (10 Hz to 3 Hz). > > > / > / > > > _______________________________________________ > 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. > > _______________________________________________ > 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. > > _______________________________________________ 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.
