PXIE-5663 Datasheet, PDF (2/8 Pages) National Instruments Corporation – Vector Signal Analyzer

Vector Signal Analyzer
enhanced NI PXIe-5622, a 16-bit, 150 MS/s ADC module. You downconvert the
signal from RF by using an NI PXIe-565x RF CW source as an LO.
With the enhanced NI PXIe-5663E, you can configure a wide- or narrow-loop
bandwidth for the VCO of the NI PXIe-5652. By using a wide-loop bandwidth,
you increase tuning time at the expense of additional phase noise; if you require
lower phase noise over faster tuning times for a particular measurement, you
can specify a narrow phase-locked loop (PLL) bandwidth for best performance.
You can achieve tuning times of less than 450 µs to under 0.1 ppm of the final
frequency when using the wide-loop bandwidth configuration.
Fast Measurement Speed
Using software-defined measurements in LabVIEW with an NI PXIe-5663/5663E,
you can perform common spectral and modulation measurements up to 30 times
faster than traditional instruments.
You can also perform common spectrum analysis measurements quickly due
to the processing power of multicore CPUs. For example, you can perform a
50 MHz spectrum sweep in 6 ms with an NI PXIe-8106 embedded controller
(30 kHz RBW). While actual performance is system-dependent, Figure 2 illustrates
the relationship between measurement time and resolution bandwidth (RBW)
for a 50 MHz spectrum.
PXI Controller
CCDF (1M sample)
EVM
ACP
OBW
NI PXIe-8130
488 ms
39.7 ms
8.8 ms
9.8 ms
NI PXIe-8106
330 ms
28.3 ms
8.2 ms
8.9 ms
Table 1. Typical Measurement Times for the NI PXIe-8130 and PXIe-8106
Embedded Controllers
For the data in Table 1, the EVM measurement was performed on 2,600
symbols, with modulation settings configured to QPSK, a symbol rate of 3.84 MS/s,
and a root raised cosine filter with an alpha of 0.22. The adjacent channel
power measurement was performed on both the lower and upper adjacent and
alternate channels. A channel bandwidth of 3.84 MHz was used, with channel
spacing set to 5 MHz.
As the results above illustrate, an NI PXIe-5663/5663E combined with a
multicore embedded PXI Express controller is able to perform measurements
significantly faster than traditional instrumentation. In fact, you can perform
most measurements up to 30 times faster than with traditional instruments.
RF List Mode
The NI PXIe-5663E provides RF List Mode support for fast and deterministic
RF configuration changes. You supply a configuration list, and the RF modules
proceed through the list without additional interaction with the host system and
driver. This makes the configuration changes deterministic. Figure 3 illustrates
this determinism with a single tone at 1 GHz stepping through six power levels
in 7 dB steps starting with -10 dBm and ending with -45 dBm and a 500 µs dwell
time specified for each step.
Figure 2. Measurement Time versus Resolution Bandwidth for a 50 MHz Spectrum
Note that for spans of less than 50 MHz – the NI PXIe-5663/5663E
instantaneous bandwidth – spectrum sweep time is completely independent of
the center frequency you choose.
In addition to spectrum sweeps, you can perform standard-specific modulation
and spectral measurements significantly faster than traditional RF spectrum
analyzers. Table 1 shows the nominal measurement times for measurements
such as complementary cumulative distribution function (CCDF), error vector
magnitude (EVM), adjacent channel power (ACP), and occupied bandwidth (OBW).
Figure 3. Deterministic 500 µs Power Steps Using the NI PXIe-5663E and RF List Mode
You can use the NI PXIe-5663E in both open- and closed-loop scenarios
to specify the source for the configuration trigger that advances from one
configuration to the next. In an open-loop situation, the NI PXIe-5663E advances
through the list based on a user-defined time specification for each step. The
closed-loop scenario relies on an external trigger that may be provided by the
DUT to advance through the RF configuration list.
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