Amateur Radio Projects

DDS Generator Filter

With the low cost DDS Generator AD9850 (Direct Digital Synthesizer) from company Analog Devices, it is now easy to build an oscillator for measurement purpose. Especially low cost modules from China you can get for about $10. The only problem is the output filter. Because it is not so easy to figure out the frequency response, I like to show in simulation (LTspice 4) what is the frequency response of some popular DDS output filters.

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-- RudolfReuter 2014-02-22 16:49:30

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