LMX2592 Datasheet, PDF (34/40 Pages) Texas Instruments – High Performance, Wideband PLLatinum RF Synthesizer

LMX2592
SNAS646A – DECEMBER 2015 – REVISED DECEMBER 2015
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8.2.1.2 Detailed Design Procedure
The integration of phase noise over a certain bandwidth (jitter) is an performance specification that translates to
signal-to-noise ratio. Phase noise inside the loop bandwidth is dominated by the PLL, while the phase noise
outside the loop bandwidth is dominated by the VCO. As a rule of thumb, jitter will be lowest if loop bandwidth is
designed to the point where the two intersect. A higher phase margin loop filter design will have less peaking at
the loop bandwidth and thus lower jitter. The tradeoff with this as longer lock times and spurs should be
considered in design as well.
8.2.1.3 Application Curves
Figure 33. Typical Jitter
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