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PXIE-5450

型号：

PXIE-5450

描述：

双通道的差分I / Q信号生成[ Dual-channel, differential I/Q signal generation ]

品牌：

NI[ National Instruments ]

页数：

6 页

PDF大小：

448 K

下载PDF手册
400 MS/s, 16-Bit I/Q Signal Generator  
NI PXIe-5450 NEW!  
• Dual-channel, differential I/Q  
signal generation  
Operating Systems  
• Windows Vista/XP/2000  
• 16-bit resolution, 400 MS/s  
sampling rate per channel  
• 98 dB close-in SFDR at 1 MHz  
• 145 MHz analog bandwidth for  
generating 290 MHz bandwidth RF signals  
Recommended Software  
• LabVIEW  
• LabWindows™/CVI  
• LabVIEW SignalExpress  
• Measurement Studio  
•
0.15 dB flatness to 120 MHz with  
digital flatness correction  
Included Software  
• NI-FGEN driver  
• 25 ps channel-to-channel skew  
• <-140 dBc/Hz phase noise density for  
10 MHz tone (1 kHz offset)  
• -160 dBm/Hz average noise density  
• 128 or 512 MB of deep  
onboard memory  
• NI-FGEN Express VIs  
• NI Modulation Toolkit  
• NI Analog Waveform Editor  
• FGEN Soft Front Panel  
• LabVIEW Real-Time driver  
• Continuous data streaming  
>600 MB/s from host  
Calibration  
• 1 Vpk-pk output, 2 PXI slots  
• Self-calibration with gain and channel  
alignment; offset correction  
• 1-year external calibration cycle  
Overview  
Signal Quality  
The NI PXIe-5450 is a 16-bit, 400 MS/s, dual-channel arbitrary waveform With 16 bits of resolution, the NI PXIe-5450 achieves a close-in SFDR  
generator optimized for I/Q communications signals. Each of the differential  
(without harmonics) of 98 dB at 1 MHz. Including harmonics and  
outputs features 98 dB of close-in spurious-free dynamic range (SFDR) at measured from DC to 200 MHz, it achieves a 1 MHz SFDR of 75 dB and  
1 MHz (without harmonics), better than -140 dBc/Hz phase noise density  
at 10 MHz (1 kHz offset), and less than 25 ps channel-to-channel skew.  
The NI PXIe-5450 is the ideal instrument to test devices with I/Q inputs  
or to serve as the baseband component of an RF vector signal generator.  
It also features onboard signal processing (OSP) functions that include  
pulse shaping and interpolation filters, gain and offset control, and a  
numerically controlled oscillator (NCO) for frequency shifting. Common  
applications include prototyping, validating, and testing of semiconductor  
components and communications, radar, and electronic warfare systems.  
With its NI Synchronization and Memory Core (SMC) architecture, the  
NI PXIe-5450 helps you integrate mixed-signal test systems by enabling  
synchronization with other instruments such as vector signal analyzers/  
generators, high-speed digitizers, digital waveform analyzers/generators,  
and other signal generators. You can also synchronize multiple arbitrary  
waveform generators to form a phase-coherent multichannel generator  
for applications such as MIMO (multiple-input, multiple-output) or  
beamforming antenna schemes.  
a wideband SFDR of 70 dB at 60 MHz. This ensures the dynamic range  
and out-of-band performance needed to meet the stringent demands of  
baseband I/Q signal generation (Figure 1).  
Figure 1. With its high sample rate and resolution, the NI PXIe-5450 generates  
low-distortion, high-SFDR signals over a very high bandwidth (the noise floor is  
limited by the measurement device).  
400 MS/s, 16-Bit I/Q Signal Generator  
The NI PXIe-5450 also delivers exceptional passband flatness (Figure 2).  
While the -3 dB analog bandwidth is 145 MHz, the digital flatness  
correction filter provides 0.15 dB of flatness from DC to 120 MHz.  
–
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0.5  
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–0.5  
–1  
–1.5  
–2  
–2.5  
–3  
–3.5  
–4  
–4.5  
Flatness Correction Enabled  
Flatness Correction Disabled  
–
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–5  
–5.5  
–6  
Figure 3. Dedicated channel-alignment circuitry automatically calibrates the two channels  
on the NI PXIe-5450 to within 25 ps. This particular module exhibits less than 13 ps of  
skew, demonstrated on a 100 MHz sinusoid.  
0
20  
40  
60  
80  
100  
120  
140  
160  
180  
Frequency (MHz)  
High-Speed Data Streaming  
Figure 2. Passband flatness is significantly improved with the use of digital flatness  
correction in the NI PXIe-5450 FPGA.  
In addition to tight synchronization, the SMC architecture on the  
NI PXIe-5450 takes advantage of the PCI Express bus to continuously  
stream data from the host controller at more than 600 MB/s in dual-channel  
mode or at 360 MB/s when generating a single channel. This enables the  
module to continuously output I/Q waveforms at 150 MS/s or, when  
upconverted, approximately 120 MHz RF bandwidth, either from host  
memory or a high-speed storage solution such as the NI HDD-8264 3 TB  
RAID array. With this technology, you can generate terabyte waveforms  
of unique, high-bandwidth data for several hours. Applications that  
benefit from this capability include RF and baseband recording and  
playback for signal intelligence and communications system design,  
validation, and verification.  
For maximum signal purity, the phase noise of this module is  
extremely low. The phase noise density of a tone generated at 10 MHz  
drops from -121 dBc/Hz at a 100 Hz offset to -150 dBc/Hz at 100 kHz,  
yielding an integrated system output jitter of less than 500 fs. Its highly  
stable phase-locked loop (PLL) and high-resolution oscillator provide an  
output sample rate resolution less than 5.7 µHz, enabling low phase  
noise signal generation at any frequency with microhertz resolution.  
An essential attribute for I/Q generation is tight synchronization  
between channels. The NI PXIe-5450 features high-performance circuitry  
that calibrates the channel skew to within 25 ps. You can achieve even  
more alignment with a 10 ps resolution programmable skew, useful in  
calibrating out cable length mismatches. This tight level of  
Onboard Signal Processing  
synchronization minimizes the phase error between channels, especially  
at high frequencies, which is essential for accurately generating high-  
bandwidth I/Q signals (Figure 3).  
OSP significantly extends waveform playback time and shortens  
waveform download times (Figure 4). A field-programmable gate array  
(FPGA) on the NI PXIe-5450 implements the OSP functionality, which  
enables several signal processing and I/Q-related functions. These  
functions include those listed on page 3.  
Onboard Signal Processing  
Digital  
Gain  
Pre-Filter  
Gain  
Pre-Filter  
Offset  
Filtering  
DAC  
DAC  
I
I
I
I
and Interpolation  
I
Frequency  
Shift  
by NCO  
I/Q  
Rate  
Waveform  
Memory  
Output  
Engine  
Digital  
Gain  
Pre-Filter  
Gain  
Pre-Filter  
Offset  
Filtering  
and Interpolation  
Q
Q
Q
Q
Q
Figure 4. OSP on the NI PXIe-5450 FPGA performs inline processing of waveform data  
before it is sent to the digital-to-analog converter (DAC) .  
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)  
2
400 MS/s, 16-Bit I/Q Signal Generator  
• Independent I and Q prefilter gain and offset – Adds gain and  
offset imbalance impairments and I and Q prefilter gain. You can adjust  
the offset before or during the generation of an output signal (Figures 5, 6).  
• Baseband interpolation – Generates smooth baseband signals.  
You can use the NI PXIe-5450 OSP block to interpolate low-sample  
rate waveforms to a much higher sample rate, thereby improving the  
output frequency spectrum by relocating zero-order sample-and-hold  
reconstruction images to higher frequencies. With the images at  
higher frequencies, the device’s image suppression filter greatly  
suppresses them without disturbing the signal’s amplitude response  
or phase information.  
Waveform Sequencing and Triggering  
You also can program the NI PXIe-5450 to sequence and loop a set of  
waveforms. You can choose from several methods to step through the  
sequence of waveforms. In cases when you know the duration of each  
waveform in advance, you can program the generator to loop them a  
specified number of times. When you do not know the duration before  
the start of generation, you can use a hardware or software trigger to  
advance the generator to the next waveform in the sequence. The  
NI PXIe-5450 implements advanced triggering behavior with four trigger  
modes: single, continuous, burst, and stepped. In addition, scripting  
provides the ability to link and loop multiple waveforms together, managing  
triggers and markers. For a detailed discussion of these modes, consult  
the NI Signal Generators Help guide available at ni.com/manuals.  
NI SMC-based generators have the unique capability of storing  
multiple sequences and their associated waveforms in the generator’s  
onboard memory (see Figure 7). In automated test applications involving  
multiple tests, each requiring a different waveform sequence, you can  
download all of the sequences and waveforms once at the beginning  
of the test cycle and store them in the generator’s memory for the entire  
session. By downloading all required waveforms and sequences once to  
an SMC-based generator instead of repeatedly reloading them for each  
test, you save time and improve throughput.  
Figure 5. LO leakage and poor image rejection of a quadrature modulator cause  
undesired RF emissions.  
Sequence  
Instructions Instructions  
Sequence  
Sequence  
Instructions  
m
Waveform Waveform  
Waveform  
n
Free  
Memory  
• • •  
• • •  
1
2
1
2
Figure 7. NI SMC-based arbitrary waveform generators increase test throughput by  
storing all the waveforms and sequences required for a set of tests in onboard memory.  
Figure 6. On-the-fly-adjustable parameters on the NI PXIe-5450 correct for the  
quadrature modulator impairments seen in Figure 5.  
Timing and Synchronization  
Using NI T-Clock (TClk) synchronization technology, you can synchronize  
multiple NI PXIe-5450 modules for applications requiring a greater  
number of channels, such as I/Q signal generation for MIMO systems.  
Because it is built into the SMC, TClk can synchronize the NI PXIe-5450  
with SMC-based vector signal analyzers and generators, high-speed  
digitizers, and digital waveform generators and analyzers for tight  
correlation of analog and digital stimulus and response. Using onboard  
calibration measurements and compensation, TClk can automatically  
• Pulse-shaping finite impulse response (FIR) filter – Shapes and  
interpolates the waveform data. FIR filter types include flat, raised  
cosine, and root raised cosine, with a programmable α parameter.  
Digital interpolation factors range from 2 to 32,768 times.  
• Numerically controlled oscillator (NCO) – Produces sinusoidal  
waveform data for complex (I/Q) frequency shifts before or during  
generation with up to a 86 MHz shift and 710 nHz resolution.  
NCO tuning time is 250 µs.  
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)  
3
400 MS/s, 16-Bit I/Q Signal Generator  
synchronize any combination of SMC-based modules with less than 500 ps error vector magnitude (EVM), modulation error ratio (MER), and ρ (rho).  
module-to-module skew. Greatly improved from traditional synchronization  
methods, the skew between modules does not increase as the number of imbalance, quadrature skew, and additive white Gaussian noise (AWGN).  
modules increases. To achieve even better performance, you can use a Visualization functions include trellis, constellation, and 2D and 3D eye  
high-bandwidth oscilloscope to precisely measure the module-to-module diagrams. This hardware and software combination gives you access to  
Functions are also available for injecting impairments including IQ gain  
skew. With the oscilloscope measurement for calibration information,  
TClk can achieve <20 ps module-to-module skew.  
customizable functionality not available in traditional instrumentation.  
Modulation/Demodulation  
• 4-, 8-, 16-, 32-, 64-, 128-, 256-QAM  
• 2-, 4-, 8-, 16-FSK  
NI PXIe-5450 clocking is very flexible. Its internal, DDS-based clock  
is optimized for phase noise performance, and has better than 5.7 µHz  
frequency resolution. The module can also import its sample clock from  
the CLK IN front panel connector and multiply and divide this clock’s  
frequency by integers. Finally, the NI PXIe-5450 can phase-lock its internal  
clock to an external reference or the PXI 10 MHz reference clock.  
• MSK and GMSK  
• 8-, 16-, 64-PSK  
• BPSK, QPSK, OQPSK, DQPSK, π/4DQPSK  
• AM, FM, PM  
Driver Software  
Modulation Analysis Functions  
Accurate, high-throughput hardware improves the performance of a  
measurement system, but easy-to-use, reliable software reduces  
development time and ongoing support costs. NI-FGEN, the driver  
software for the NI PXIe-5450, is the world’s most advanced and  
thoroughly tested arbitrary waveform generator software. It features:  
• Intuitive application programming interface (API) – In NI LabVIEW  
and LabWindows/CVI as well as Microsoft Visual Basic and Visual  
C/C++, the NI-FGEN API is engineered to use the least number of  
functions possible while maintaining flexibility. Each driver function has  
thorough online searchable documentation. The NI-FGEN Instrument Driver  
Quick Reference guide further simplifies programming by providing an  
overview of each driver function’s LabVIEW icon, function name, parameters,  
and data types.  
• ρ (rho)  
• DC offset  
• Phase error  
• Quadrature skew  
• IQ gain imbalance  
• Frequency deviation  
• Burst timing measurements  
• Error vector magnitude  
• Bit error rate (BER)  
• Additive white Gaussian noise  
• Modulation error ratio (MER)  
Visualization and Analysis  
• Trellis diagrams  
• Constellation plot  
• 2D and 3D eye diagrams  
Modulation Impairments  
• LabVIEW Express VIs – For generating an arbitrary repetitive signal, • Multitone  
the LabVIEW Express VI is a configuration-driven method of programming • Fading profile  
the NI PXIe-5450 without accessing the underlying NI-FGEN functions. • Quadrature skew  
• DC offset  
• Frequency offset  
• IQ gain imbalance  
• Soft Front Panel – For quick, nonprogrammatic use of the NI PXIe-5450,  
1The NI Modulation Toolkit data sheet is available separately.  
the Soft Front Panel supports arbitrary waveform generation.  
• Example Programs – NI-FGEN provides 23 programming examples for Analog Waveform Editor2  
LabVIEW, LabWindows/CVI, Visual C++ 6.0 and .NET, and Visual Basic 6.0, The NI Analog Waveform Editor is an interactive software tool for  
giving developers references on which to base custom applications.  
• LabVIEW Real-Time Support – For remotely deployed, autonomous  
measurement systems or applications requiring the highest possible  
reliability, NI-FGEN works with the LabVIEW Real-Time Module.  
creating and editing analog waveforms. In the editor, each waveform  
comprises different components, and each component comprises a  
collection of primitives. You can create a new waveform segment by  
selecting from a library of more than 20 waveform primitives (Table 1),  
by entering a mathematical expression, or by importing data from a file.  
You can then combine waveform primitives point-by-point using addition,  
subtraction, multiplication, or division to create more complex segments  
(Figure 8). You can also concatenate multiple segments to make a larger  
waveform. To further process the waveform, you can apply standard or  
custom FIR and IIR filters or smooth any discontinuities between different  
waveform segments. Once complete, all the waveform settings are  
Modulation Toolkit for LabVIEW1  
The NI Modulation Toolkit for LabVIEW provides functions for signal  
generation, analysis, and visualization of custom and standard analog  
and digital modulation. With the Modulation Toolkit, you can develop  
and analyze custom modulation formats and generate these with the  
NI PXIe-5450. Some of the standard measurement functions include  
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)  
4
400 MS/s, 16-Bit I/Q Signal Generator  
stored along with the waveform’s raw sample data, making it easy to  
reload the waveform in the editor and modify the settings of a particular  
segment or primitive.  
2The NI Analog Waveform Editor data sheet is available separately.  
Figure 8. You can combine more than 20 different waveform primitives to create more  
complex waveforms.  
Waveform Primitives  
Sine  
Square  
Triangle  
Triangular noise  
Gaussian noise  
Sinc  
Trapezoid  
Stairstep  
Haversine  
Sawtooth  
Uniform noise  
Gaussian pulse  
Exponential rise/decay  
Impulse  
Lorentzian pulse  
Table 1. Partial List of Configurable Waveform Primitives Available in the NI Analog  
Waveform Editor  
Specifications  
For complete specifications, see the NI PXIe-5450 Specifications manual  
at ni.com/manuals.  
Ordering Information  
NI PXIe-5450 ......................................................................780419-0M1  
1M (onboard memory): 1 (128 MB), 2 (512 MB)  
Includes NI-FGEN driver, FGEN Soft Front Panel, NI Modulation Toolkit for LabVIEW, and  
NI Analog Waveform Editor.  
Recommended PXI Switch  
NI PXI-2546............................................................................778572-46  
Note: All images show typical results for one production-quality  
NI PXIe-5450.  
BUY NOW!  
For complete product specifications, pricing, and accessory  
information, call 800 813 3693 (U.S.) or go to ni.com/signalgenerator.  
BUY ONLINE at ni.com or CALL 800 813 3693 (U.S.)  
5
NI Services and Support  
NI has the services and support to meet  
Local Sales and Technical Support  
your needs around the globe and through  
the application life cycle – from planning  
and development through deployment  
and ongoing maintenance. We offer  
services and service levels to meet  
customer requirements in research,  
design, validation, and manufacturing.  
Visit ni.com/services.  
In offices worldwide, our staff is local to the country, giving you access  
to engineers who speak your language. NI delivers industry-leading  
technical support through online knowledge bases, our applications  
engineers, and access to 14,000 measurement and automation  
professionals within NI Developer Exchange forums. Find immediate  
answers to your questions at ni.com/support.  
SERVICE  
NEEDS  
We also offer service programs that provide automatic upgrades to  
your application development environment and higher levels of technical  
support. Visit ni.com/ssp.  
Training and Certification  
NI training is the fastest, most certain route to productivity with our  
products. NI training can shorten your learning curve, save development  
time, and reduce maintenance costs over the application life cycle. We  
schedule instructor-led courses in cities worldwide, or we can hold a  
course at your facility. We also offer a professional certification program  
Hardware Services  
NI Factory Installation Services  
NI Factory Installation Services (FIS) is the fastest and easiest way to  
use your PXI or PXI/SCXI combination systems right out of the box.  
that identifies individuals who have high levels of skill and knowledge on Trained NI technicians install the software and hardware and configure  
using NI products. Visit ni.com/training.  
the system to your specifications. NI extends the standard warranty by  
one year on hardware components (controllers, chassis, modules)  
purchased with FIS. To use FIS, simply configure your system online  
with ni.com/pxiadvisor.  
Professional Services  
Our NI Professional Services team is composed of NI applications  
and systems engineers and a worldwide National Instruments Alliance  
Partner program of more than 600 independent consultants and  
integrators. Services range  
Calibration Services  
NI recognizes the need to maintain properly calibrated devices for  
high-accuracy measurements. We provide manual calibration  
procedures, services to recalibrate your products, and automated  
calibration software specifically designed for use by metrology  
laboratories. Visit ni.com/calibration.  
from start-up assistance to  
turnkey system integration.  
Visit ni.com/alliance.  
OEM Support  
We offer design-in consulting and product integration assistance if you  
want to use our products for OEM applications. For information about  
special pricing and services for OEM customers, visit ni.com/oem.  
Repair and Extended Warranty  
NI provides complete repair services for our products. Express repair  
and advance replacement services are also available. We offer  
extended warranties to help you meet project life-cycle requirements.  
Visit ni.com/services.  
ni.com • 800 813 3693  
*351631A-01*  
351631A-01  
2008-9814-101-D  
National Instruments • info@ni.com  
©2008 National Instruments. All rights reserved. CVI, LabVIEW, Measurement Studio, National Instruments, National Instruments Alliance Partner, NI, ni.com, SCXI, and SignalExpress  
are trademarks of National Instruments. The mark LabWindows is used under a license from Microsoft Corporation. Windows is a registered trademark of Microsoft Corporation in the  
United States and other countries. Other product and company names listed are trademarks or trade names of their respective companies. A National Instruments Alliance Partner is a  
business entity independent from National Instruments and has no agency, partnership, or joint-venture relationship with National Instruments.  
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