3 Short-Range Comms & IoT Mode
3.8 SEM Measurement
LNA is an additional preamplifier that provides superior DANL and frequency range
compared to "Internal Preamp" on page 1657. LNA provides lower system noise
figure, especially at frequencies above 100MHz, and can be operated up to the full
range of 50GHz instruments.
For best possible sensitivity, LNA can be turned on together with "Internal Preamp"
on page 1657, although if you operate both preamps together, note that the TOI
(distortion) specifications are impacted. The sensitivity improvement of this
combination is substantial when operating in high band (frequencies above
3.6GHz).
For more details about annotation, see "More Information" on page 1064
Remote Command
[:SENSe]:POWer[:RF]:GAIN:LNA[:STATe] OFF | ON | 0 | 1
[:SENSe]:POWer[:RF]:GAIN:LNA[:STATe]?
Example
:POW:GAIN:LNA ON
Dependencies Requires OptionLNA, except for VXT models M9415A/16A
Does not appear in VXT models M9420A/10A/11A
M9410E/11E/15E/16E support LNA
May not appear in some measurements
LNA is not available when the electronic/soft attenuator is enabled
Preset
OFF
State Saved Saved in State
More Information
When LNA is installed, the preamp annotation changes to show the state of both
LNA and Internal Preamp. Below is an example:
Note that when operating entirely in the low band (below about 3.6GHz), if LNA is
on, Internal Preamp is switched off (even if you have its switch set to ON). This is
because the noise performance is actually degraded in low band if both preamps are
on. In this case, the annotation reflects the actual state of the two preamps, but the
Internal Preamp annotation displays in amber, to warn you that the actual state of
Internal Preamp does not match its switch control display:
1064 Short Range Comms & IoT Mode User's &Programmer's Reference
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