Leftyretro
New Member
I've used DDS in the past also. Use to be quite expensive chips but now at least for some, they can be quite cost effective. They do require a post low pass filter but that's not to hard to do. DDS clock input must be X2+ higher then the highest desired output frequency. Some jitter and spurs are produced but still useful for all but the most demanding spectral purity applications.
I've read that one current state of the art solution for the demanding application of a very low noise and clean local oscillator for communication receivers is having a DDS drive a PLL. The DDS gives precise frequency control and the PLL (via a VCO) cleans up the spurs.
Lefty
I've read that one current state of the art solution for the demanding application of a very low noise and clean local oscillator for communication receivers is having a DDS drive a PLL. The DDS gives precise frequency control and the PLL (via a VCO) cleans up the spurs.
Lefty
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