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"W3JDR" writes:
From what I've seen in the data sheets, the closer you operate the RF output to the Nyquist limit (Fref/2), the cleaner the spurs get. I've seen numbers of -90 dB or better on even some of the cheapo Analog Devices parts. Joe W3JDR It has to do with where the spurs end up. If you are close to Fref/2, lots of the spurs alias down to base band. Worst case is Fref/3. With the proper choice of filters, and band choice you can find areas where spurs are almost non-existent. If you have a narrow band application, your frequency planning can find those holes. Make sure you have your peak detector turned on. There are lots of sources of spurs-- phase truncation, amplitude truncation, noise, etc. -- Steven D. Swift, , http://www.novatech-instr.com NOVATECH INSTRUMENTS, INC. P.O. Box 55997 206.301.8986, fax 206.363.4367 Seattle, Washington 98155 USA |
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