Keysight Technologies N5249A Configuration Manual page 14

Embedded LO measurements (Option 084)
PNA-X PNA PNA-L
This option tunes the analyzer's receivers to the output frequency
of the converter under test without the need for access to internal
LOs or a common reference signal. For converters with embedded
LOs, this option requires Option 082 (enables match-corrected
conversion loss/gain measurements) or Option 083 (enable absolute
group delay measurements). This option also works with Option
086 gain compression application, Option 087 intermodulation
distortion application, and Option 028/029/H29 noise figure
applications.
Gain compression application (Option 086)
PNA-X PNA PNA-L
The gain compression application (GCA) provides input power,
output power, gain, and phase at the compression point of an
amplifier or frequency converter, over a specified frequency
range. GCA's SMART Sweep is very fast and easy-to-use. GCA
also includes a guided calibration that corrects for absolute
power levels, frequency response, and mismatch errors.
Intermodulation distortion application
(Option 087) PNA-X
The intermodulation distortion (IMD) application makes it very
easy to set up and calibrate swept-IMD measurements of both
amplifiers and frequency converters. It controls the frequency
and power of internal and external sources and tunes the
receivers to the main tones as well as the IMD products in a single
measurement channel. The user can sweep either the center
frequency of the two stimulus signals, the frequency spacing
of the two stimulus signals about a fixed center frequency, or
the power of one or both stimulus signals or the power of the
LO signal. The analyzer can measure intermodulation distortion
products of order 2, 3, 5, 7, or 9, and can display the associated
intercept points. In addition, an IM Spectrum mode gives a
spectrum-analyzer-like display for confirming or trouble-shooting
measurements. Requires Option 080. Not available with PNA
Options 200, 210, 400 and 410. When configured with a 2-port
PNA or 2-port PNA-X with either Option 200 or 219, an external
signal generator and a combiner are required. When configured
with a 4-port PNA or 4-port PNA-X with Option 400 or 419, the
two internal sources and an unused test port coupler configured
as a combiner can be used for two-tone IMD measurements.
When configured with PNA-X Option 224 or 423, the two internal
sources and internal combiner can be used for two-tone IMD
measurements.
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PNA PNA-L
Source phase control (Option 088)
PNA-X PNA PNA-L
This option allows users to set calibrated, arbitrary phase
differences between two signal sources. The sources can be the
analyzer's internal sources or external signal generators routed
through the analyzer's test set. The phase difference can be
fixed, or swept between two specified phase values. Option 088
also controls the relative power level between the sources using
the receiver-leveling feature. Option 088 is targeted for active-
load control, where the analyzer provides a precise, electronically
settable impedance to the output port of a device, while gain and
output power are measured. This capability can be combined
with external load-pull software to create traditional load-pull
power contours. Not available with PNA Options 200 and 210.
Differential and I/Q devices application (Option 089)
PNA-X PNA PNA-L
This option combines source-phase control of multiple internal or
external sources with frequency-offset mode, enabling simplified
test of I/Q modulators/converters and differential mixers, and
harmonic measurements of differential amplifiers. The phase
difference between sources can be fixed (for example, at 90 or
180 degrees), or swept between two specified phase values.
Providing accurate control of the relative phase between sources
eliminates the need for hybrid couplers and baluns to create
quadrature or differential signals. After achieving the desired
phase alignment, the instrument's receivers can be tuned to all
frequencies needed to characterize the DUT. On an I/Q modulator
for example, measurements can be made of both the desired
and suppressed conversion bands, along with LO leakage,
harmonics and other spurious signals. Phase sweeps can be used
to determine a DUT's phase imbalance versus frequency. Users
can specify measurements with individual receivers or multiple
receivers combined with a wide range of mathematical operators.
Power measurements can employ match correction for increased
accuracy. Option 089 only works on 4-port PNA or PNA-X
models, and requires Option 080 and Windows 7 OS.
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