Agilent Technologies Signal Analyzer N9030a - Manual (Page 542)

6 RLC Swept SA Measurement Front-Panel & SCPI Reference
AMPTD Y Scale
Selecting the Low Noise Path Enable option provides a lower noise floor, especially in the 21–26.5
GHz region, though without improving many measures of dynamic range, and without giving the
best possible noise floor. The preamp, if purchased and used, gives better noise floor than does
the Low Noise Path, however its compression threshold and third-order intercept are much poorer
than that of the non-preamp Low Noise Path. There are some applications, typically for signals
around −30 dBm, for which the third-order dynamic range of the standard path is good enough,
but the noise floor is not low enough even with 0 dB input attenuation. When the third-order
dynamic range of the preamp path is too little and the noise floor of the standard path is too
high, the Low Noise Path can provide the best dynamic range.
Key Path AMPTD Y Scale
Mode SA, BASIC, PNOISE, VSA , LTE, LTETDD
Scope Meas Global
Remote Command [:SENSe]:POWer[:RF]:MW:PATH STD|LNPath|MPBypass|FULL
[:SENSe]:POWer[:RF]:MW:PATH?
Example :POW:MW:PATH LNP Enables the Low Noise path
Notes If a Presel Center is performed, the analyzer will momentarily switch to the Standard Path,
regardless of the setting of µW Path Control
The DC Block is always switched in when the low noise path is switched in, to protect
succeeding circuitry from DC. Note that this does not mean “when the low noise path is
enabled” but when, based on the Low Noise Path rules, the path is actually switched in. This
can happen when the selection is Low Noise Path Enable . In the case where the DC Block is
switched in the analyzer is now AC coupled. However, if you have selected DC coupling, the UI
will still behave as though it were DC coupled, including all annunciation, warnings, status bits,
and responses to SCPI queries. This is because, based on other settings, the analyzer could
switch out the low noise path at any time and hence go back to being DC coupled.
Alignment switching ignores the settings in this menu, and restores them when finished.
Dependencies Unavailable in BBIQ and External Mixing
Preset
l
All modes other than IQ Analyzer mode and VXA: STD
l
IQ Analyzer, VXA and WLAN mode:
l
MPB option present and licensed: MPB
l
MPB option not present and licensed: STD
State Saved Save in instrument state
Readback Value selected in the submenu
Initial S/W Revision A.04.00
Modified at S/W
Revision A.10.00
542 Remote Language Compatibility Measurement Application Reference