YSG-140 Low Phase Noise Frequency Source

The YSG-140 accepts a 10 MHz reference signal and provides RF, 100 MHz, reference-lock, and power status interfaces on the front panel. The YSG-140 and YSG-140L variants provide tabulated phase-noise performance across 1, 5, 10, 20, and 44 GHz operating points.

Integration Notes

Drive the reference input at +5 to +10 dBm, and use the 100 MHz output to lock a second instrument from the same reference instead of running two references in one rack. Budget a +12 V supply voltage rail with headroom over the ≤ 1.2 A current consumption, and plan the bay around the 154 × 96 × 33 mm enclosure and the -20 to +50 °C operating window. Harmonic suppression is the looser of the two output-purity figures, so confirm the harmonic content against the front end the source drives before treating the output as clean.

Because the YSG-140 output frequency is fixed in production, the operating point has to be settled before the order rather than tuned on the bench, and a second operating frequency means a second unit. The two variants are otherwise alike and separate on close-in noise alone: at a 10 kHz offset the YSG-140 is specified at -135 dBc/Hz on a 1 GHz carrier and -113 dBc/Hz at 20 GHz, where the YSG-140L reaches -154 dBc/Hz and -126 dBc/Hz. Specify the L variant where the downstream receiver can resolve that difference, and the standard part where the receiver’s own noise floor sets the limit.