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AD9910 ramp mode to lower bandwidth

Question asked by ScottIncz on Jul 1, 2012
Latest reply on Jul 10, 2012 by LouijieC

Brain trust

 

As many of you will be aware, the level of side bands created by fm modulation by dds depends on the update rate to modulating frequency ratio. Increasing update rate can help but at the expense of horsepower required by the loading / update mpu.

 

Has anyone successfully dynamically reprogrammed the ramp modes upper and lower frequencies at high speed to create single tone fm modulation with less side bands than what would be created using single tone update methods? Having the dds ramp rather than step should significantly reduce side bands and the need to increase the update rate to the

 

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