You are able to explore two solitary DDS devices one to efforts on the same learn time clock in order to efficiency two signals whose stage dating are able to become truly regulated. In Profile 8, a couple AD9834s was developed on a single reference clock, with similar reset pin getting used in order to improve each other bits. Using this type of setup, you’ll be able to manage I-Q modulation.
An excellent reset need to be asserted once stamina-up-and before mobile people data to your DDS. So it set the newest DDS output so you can a well-known phase, and that functions as an average source section enabling synchronization out-of multiple DDS devices. When the new data is delivered additionally so you can multiple DDS equipment, a coherent phase relationships might be handled, as well as their relative stage offset will likely be predictably shifted from the function of one’s stage-offset check in. This new AD9833 and AD9834 have a dozen bits of phase quality, with a beneficial solution regarding 0.step 1 training. [For additional informative data on synchronizing multiple DDS tools excite pick Software Mention A keen-605.]
Stage music are a measure (dBc/Hz) of short-identity frequency instability of the oscillator. It’s counted because the unmarried-sideband noise because of alterations in regularity (into the plitude at functioning regularity of your own oscillator having fun with an effective 1-Hz bandwidth) at the two or more regularity displacements from the working regularity out-of the fresh new oscillator.