ADF4169

Roy Keeney on May 4, 2020

With a reference frequency of 112 MHz what level of fractional boundary spurious can I expect to see over the 4 to 8 GHz range? With 112 MHz reference frequency the step size is approximately 3.338 Hz.

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Brigid.Duggan
May 11, 2020 +1 verified
Hi Roy, The fractional spur values are every application-specific..., the lower you can make your loop filter the more attenuation you will get , that said, the ADF4159 uses a very large modulus which…

0 Brigid.Duggan

on May 11, 2020 4:22 PM
Hi Roy, The fractional spur values are every application-specific..., the lower you can make your loop filter the more attenuation you will get , that said, the ADF4159 uses a very large modulus which effectively spreads the fractional spurs into the noise floor, see page 34 of the datasheet. regards Brigid.
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