Figure 2-1 shows the phase noise performance of the LMX1204 evaluation board (LMX1204EVM) driven by the SMA100B signal generator. Device performance will be captured at the frequencies: 1 GHz, 3 GHz, 6 GHz, 10 GHz, and 12.8 GHz.

Figure 2-1 LMX1204EVM Phase Noise Measurements

The LMX1204EVM 2.5-V power supply comes from the R&S FSWP26 phase noise analyzer to avoid DC switching supply spurs coupling to the generated outputs. The LMX1204EVM operates in bypass at its highest output power.