2.7 GHz RF Vector Signal Analyzer with Digital Downconversion
NI PXI-5661
• 9 kHz to 2.7 GHz
• 20 MHz real-time bandwidth with
quadrature digital downconversion
• Burst power triggering
• High-stability timebase (10 MHz OCXO)
• ±20 ppb frequency stability
• ±50 ppb frequency accuracy
• Up to 80 dB spurious-free dynamic range
• +30 dBm full signal input range
• 14-bit resolution, 100 MS/s digitizer
• 64 or 256 MB memory
Operating Systems
• Windows 2000/XP
Recommended Software
• LabVIEW
• LabWindows/CVI
• Modulation Toolkit
Application Software (included)
• Spectral Measurements Toolkit
Driver Software (included)
• NI-RFSA
Overview
The National Instruments PXI-5661 is a modular 2.7 GHz RF vector signal
analyzer with wide real-time bandwidth, optimized for automated test in a
compact, 3U PXI package. It is ideal for high-throughput RF acquisition and
measurements. The 20 MHz wide onboard quadrature digital downconverter
(DDC) significantly reduces the required load size and the time Needed to
transfer waveform data to the host controller or PC. This functionality
is ideal for engineers who require data streaming with rapid response time
for software-defined radio (SDR), real-time signal processing, or faster
transfer times for spectral monitoring applications. The module is also
compatible with Conduant StreamStor devices, enabling terabyte recording.
The NI PXI-5661 RF analyzer also includes a burst power trigger ideal
for communications applications and signal intelligence. The PXI-5661
features a highly stable timebase and flexible software tools, including
Express VIs for National Instruments LabVIEW.
The NI Spectral Measurements Toolkit for LabVIEW and
LabWindows/CVI accompanies the PXI-5661, providing common
measurements such as power spectrum, peak power and frequency, in-band
power, adjacent-channel power, and occupied bandwidth. Additionally,
it offers vector capabilities, such as 3D spectrograms, I/Q data for
modulation analysis, and analog modulation analysis functions for LabVIEW.
You can also use the PXI-5661 with the NI Modulation Toolkit to analyze
custom and standard modulation formats.
Frequency Characteristics
The PXI-5661 provides outstanding frequency characteristics over its
operating range of 9 kHz to 2.7 GHz. It offers a typical noise density of
<-140 dBm/Hz, extendable to -165 dBm/Hz with a PXI-5690 preamplifier,
and up to 80 dB of intermodulation spurious-free dynamic range.
Typical phase noise is <-94 dBc/Hz at a 10 kHz offset.
Superior Measurement Throughput
The most significant advantage of the PXI-5661 over traditional
RF instrumentation is measurement throughput. Figure 1 illustrates the
difference in throughput between the PXI-5661 and a traditional analyzer.
Two comparisons are shown. One graph is a spectral sweep that illustrates
the advantages of the wide real-time bandwidth of the downconverter.
The other graph is an in-band power measurement comparison that
shows the throughput advantages of the PXI-5661 as a whole.
Hardware
The PXI-5661 consists of a 2.7 GHz downconverter and a
high-spectral-purity digitizer.
Analog Input
The PXI-5661 can acquire a wide range of signal levels, from +30 dBm
to less than -130 dBm, and provides up to 50 dB of input attenuation,
selectable in 10 dB steps.
Figure 1. PXI-5661 Performance Benchmarks
NI [ NATIONAL INSTRUMENTS CORPORATION ]
