R31DS0038EU0204 Rev.2.04

Page 8

Aug 14, 2026

551S Datasheet

2.5

Phase Noise Plots

Figure 2. 551S Reference Phase Noise 62fs (12kHz to 20MHz)

Figure 3. 551S Output Phase Noise 77fs (12kHz to 20MHz)

The phase noise plots above show the low Additive Jitter of the 551S high-performance buffer. With an integration

range of 12kHz to 20MHz, the reference input has about 62fs of RMS phase jitter while the output has about 77fs

of RMS phase jitter. This results in a low Additive Phase Jitter of only 45fs.