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Step-By-Step Overview of SpurKiller Technique

Step-By-Step Overview of SpurKiller Technique. SpurKiller Technology. Direct Digital Synthesis is a sampled system. In sampled systems, spurs are a fact of life. Typical Narrow Band spectrum with spurs. SpurKiller Technology. Spurs ARE... Predictable

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Step-By-Step Overview of SpurKiller Technique

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  1. Step-By-Step Overview of SpurKiller Technique

  2. SpurKiller Technology Direct Digital Synthesis is a sampled system... In sampled systems, spurs are a fact of life Typical Narrow Band spectrum with spurs

  3. SpurKiller Technology Spurs ARE... • Predictable • Frequencies at which spurs appear are simple functions of the sampling rate and the programmed output frequency BUT… • Fairly repeatable • Frequencies are constant for any FTW • Phase of each spur does not change • Amplitude does change somewhat across temp/process/voltage SO…

  4. SpurKiller Technology - Narrowband Problematic spurs in the output spectrum can be cornered and attacked using our patented ‘SpurKiller’ technology ‘SpurKiller’ technology utilizes additional internal DDS channel(s) to knock selected spurs down to the noise floor

  5. -51.76 dB Wideband spur example

  6. -66.20 dB Wideband spur knocked down 14 dB improvement wideband SFDR Noise floor rises a little

  7. SpurKiller Technology Step 1: Find your largest spur

  8. SpurKiller Technology Step 2: Program SpurKiller channel to a frequency slightly higher than that spur

  9. SpurKiller Technology Step 3: Program SpurKiller channel amplitude to match spur amplitude

  10. SpurKiller Technology Step 4: Program SpurKiller channel to match spur frequency

  11. SpurKiller Technology Step 5: Adjust phase of SpurKiller channel until the spur is minimized Note: The Spurkiller function on the AD9912 automatically performs some of the steps

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