Note: Where accurate measurements are required on a high VSWR signal source, a high quality
10 dB coaxial attenuator, such as a Keysight 8493C, will drastically reduce mismatch uncertainty
and provide more accurate measurements.
10.2.2 Typical IP3
IP3 testing for receivers is typically run with preamplifier off, or a combination of preamplifier gain
and attenuation equivalent to 0 dB gain. For the SM200, 20 dB of RF preamplifier gain and 20 dB
of RF attenuation is achieved at 0 dBm reference level. Setup requires a directional coupler or
other directional combiner to provide sufficient isolation between generators. Additionally, devices
are tested at -10 dBm reference level and normalized to 0 dBm. Because the switch and
attenuator linearity in the SM200 are much higher than the amplifier or mixer, this introduces
minimal error, and requires only 15 dB of additional isolation between generators.
10.3 SM435
10.3.1 Typical Phase Noise
The table below shows the typical 1MHz and 10MHz phase noise performance at several carrier
frequencies for the SM435.
For carrier frequencies above 1 GHz, add 20 log
10
(F/1 GHz) for typical performance.
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