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SNAU136 Datasheet(PDF) 21 Page - Texas Instruments

Part No. SNAU136
Description  The Texas Instruments LMX2581EVM evaluation module (EVM) helps designers evaluate the operation and performance of the LMX2581 Wideband Frequency Synthesizer.
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Maker  TI [Texas Instruments]
Homepage  http://www.ti.com
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SNAU136 Datasheet(HTML) 21 Page - Texas Instruments

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November 2012
SNAU136
21
Impact of Increasing the Phase Detector Frequency
2nd Order modulator, Fpd =100 MHz, Kpd=5x, PFD_DLY = 1460 ps, Strong Dithering
For this measurement, the phase detector was increased by a factor of 5 and the charge pump gain was
lowered by a factor very close to 5. This keeps the loop bandwidth constant and allows a measurement
with the same device and loop filter parameters to compare only the impact of changing the phase
detector frequemcy. Comparing to the very first (default) measurement, we see that many spurs are gone,
but the integer boundary spur at 3 MHz offset has increased by about 15 dB.
In general, a higher phase detector frequency does tend to lead to better phase noise and spurs except for
the integer boundary spur, which is worse for higher phase detector frequencies.


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