Altera JNEye - Manual (Page 156)

Phase Noise Spurs
Frequency Phase Noise (dBc) Frequency Amplitude (dBc)
1 KHz –84 10 MHz –96
1 MHz and above –140
Figure 3-4: Transmitter Reference Clock Characteristics
The PLL in the Stratix V GX transmitter is enabled using ATX (LC) with low bandwidth configuration.
The PLL effectively reduces the noise effects from the external reference clock.
UG-1146
2015.05.04
Methodology 3-5
Tutorial: PCI Express 8GT Altera Corporation
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