NIPXIE-5673E [NI]
Vector Signal Generator; 矢量信号发生器
| 型号： | NIPXIE-5673E |
| 厂家： | 
National Instruments |
| 描述： | Vector Signal Generator |
| 文件： | 总9页 (文件大小：1371K) |
| 中文： | 中文翻译 | 下载： | 下载PDF数据表文档文件 |
Vector Signal Generator
NI PXIe-5673, NI PXIe-5673E
◾◾
85 MHz to 6.6 GHz frequency range
>100 MHz bandwidth
Up to +10 dBm RF power
112 dBc/Hz phase noise at 10 kHz
offset at 1 GHz
66 dBc adjacent-channel leakage ratio
for WCDMA-like signals
Operating System
◾◾
◾◾
◾◾
◾◾
Windows 7/Vista/XP/2000
Included Software
◾◾
NI Modulation Toolkit
◾◾
NI-RFSG driver
◾◾
Programming API
◾◾
LabVIEW Real-Time
LabWindows /CVI
◾◾
◾◾
◾◾
<7.5 ms tuning time
™
◾◾
-64 dBc typical image rejection at 2.4 GHz
-64 dBc typical carrier suppression
at 2.4 GHz
◾◾
C++/.NET
◾◾
◾◾
Full bandwidth streaming
from disk (100 MS/s)
RF List Mode support for NI PXIe-5673E
As Figure 1 illustrates, the NI PXIe-5673 consists of the NI PXIe-5611 RF
upconverter, the NI PXI-5652 RF continuous wave (CW) source, and the
NI PXIe-5450 dual-channel arbitrary waveform generator (AWG). The NI PXI-5652
CW source uses a voltage-controlled oscillator (VCO) architecture, enabling
frequency tuning times no greater than 6.5 ms. In addition, the NI PXIe-5450
AWG 16-bit digital-to-analog converter (DAC) generates baseband I and Q
signals at data rates of up to 200 MS/s. At this sample rate, the generator is
capable of producing more than 100 MHz of RF bandwidth. Figure 2 shows
a QPSK signal with more than 100 MHz of bandwidth at 5.8 GHz. The signal
represented is configured for a symbol rate of 100 MS/s and a root raised cosine
filter with an alpha of 0.22.
Overview
The NI PXIe-5673 and PXIe-5673E are wide-bandwidth 6.6 GHz RF
vector signal generators. Combined with the appropriate software, an
NI PXIe-5673/5673E can generate a variety of signals. With the NI Modulation
Toolkit for LabVIEW, it can generate different waveforms including AM, FM,
CPM, ASK, FSK, MSK, PSK, QAM (4, 16, 64, and 256), multitone signals, arbitrary
waveforms, and many others. In addition, you can combine these vector signal
generators with standard-specific software to generate signals for GPS, GSM/
EDGE/WCDMA, WLAN, WiMAX, DVB-C/H/C, ISDB-T, ZigBee, and others. With
NI PXIe-5673/5673E stream-from-disk capabilities, you can generate continuous
waveforms that are up to several terabytes in length.
Basic Architecture
The NI PXIe-5673 uses direct RF upconversion from differential baseband I and Q
signals. A block diagram of the system is shown in Figure 1.
NI PXIe-5450
DAC
NI PXIe-5611
90
˚
DAC
NI PXI-5652
Figure 2. QPSK Signal with Wide Bandwidth
Figure 1. Block Diagram of the NI PXIe-5673
Vector Signal Generator
Enhanced Architecture
RF List Mode
The NI PXIe-5673E (E for enhanced) offers additional performance and features
including RF List Mode support and configurable loop bandwidth for decreased
tuning times. As with the NI PXIe-5673, the NI PXIe-5673E comprises three
modular instruments. The NI PXIe-5450 is a dual-channel AWG that provides
16-bit digital-to-analog conversion and generates baseband I and Q signals at
data rates of up to 200 MS/s. You then can use an enhanced NI PXIe-5611 RF
upconverter with an NI PXIe-565x CW source acting as the local oscillator (LO)
for direct upconversion to RF.
The NI PXIe-5673E provides 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, making the configuration changes deterministic. Figure 4 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. Analysis was performed using the NI PXIe-5663E vector
signal analyzer.
With the enhanced NI PXIe-5673E, you can configure a wide- or narrow-loop
bandwidth for the VCO of an NI PXIe-565x. 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 300 µs to under 0.1 ppm of the final
frequency when using the wide-loop bandwidth configuration.
Fast Waveform Downloads
One of the biggest advantages of PXI Express instrumentation is the benefit of
high-speed waveform transfer rates. Using an NI PXIe-5673/5673E, you can
download waveforms onto an instrument’s memory significantly faster than with
traditional instrumentation. Using a x4 PCI Express interface, you can download
waveforms to memory at speeds of up to 800 MB/s.
Figure 4. Deterministic 500 µs Power Steps Using the NI PXIe-5673E and RF List Mode
You can use the NI PXIe-5673E 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-5673E 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
device under test to advance through the RF configuration list.
Phase-Coherent Generation
The flexible architecture of an NI PXIe-5673/5673E enables multiple instruments
to share a common start trigger, reference clock, and even an LO. As a result, you
can synchronize up to four NI PXIe-5673/5673E RF vector signal generators for
phase-coherent signal generation. A typical configuration of two synchronized
generators is shown in Figure 3. With up to four channels of synchronized RF
signal generation, you can easily address MIMO and beamforming applications.
RF Record and Playback
You can combine an NI PXIe-5673/5673E with a PXI RF vector signal analyzer for
record and playback applications. Using a 2 TB redundant array of inexpensive
disks (RAID) volume, you can continuously generate up to 100 MHz (400 MB/s)
for more than 1.5 hours. In this application, an NI PXIe-5663/5663E vector
signal analyzer records up to two hours of continuous RF signal and the data is
stored as a binary file on a RAID volume. The NI PXIe-5673/5673E then streams
recorded waveforms from disk. In addition to recorded waveforms, you can use
streaming technology to generate large simulated waveforms.
NI PXIe-5450
DAC
NI PXIe-5611
90
˚
DAC
NI PXIe-5450
DAC
NI PXIe-5611
High-Performance Signal Generation
Higher-order modulation schemes such as 256-QAM require strong dynamic
range and phase noise performance. Using an NI PXIe-5673/5673E, you can
generate a variety of signals with significant accuracy. As shown in Figure 5,
a loopback configuration with an NI PXIe-5673/5673E and NI PXIe-5663/5663E
yields a typical EVM (RMS) measurement of 0.5 percent (1250 symbols, software
equalization disabled).
90
˚
DAC
NI PXI-5652
Figure 3. Simplified Block Diagram of Synchronized RF Vector Signal Generators
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2
Vector Signal Generator
Figure 5. Constellation Plot of 256-QAM
Figure 7. Spectrum of QPSK Signal at 1 GHz
In Figure 5, a center frequency of 1 GHz, a symbol rate of 5.36 MS/s, and a
root raised cosine filter with 0.12 alpha was used. The RF power was set to -10 dBm
and analysis was performed with the NI PXIe-5663. In addition, the wide
bandwidth of an NI PXIe-5673/5673E combined with high-performance image
rejection enabled the generation of modulated signals at high symbol rates. For
example, Figure 5 shows a constellation plot of a 64-QAM signal at 40.99 MS/s
with an RMS EVM of 0.9 percent (1250 symbols, equalization disabled).
A symbol rate of 3.84 MS/s and a root raised cosine filter with alpha 0.22 is
used. As Figure 7 illustrates, an NI PXIe-5673/5673E yields an adjacent channel
power measurement of better than -69 dBc rejection when configured with the
settings described.
Flexible Software
With NI Modulation Toolkit for LabVIEW software, you can operate an
NI PXIe-5673/5673E as a general-purpose vector signal generator. Using
NI LabVIEW or LabWindows/CVI example programs, you can generate a variety
of modulated signals.
These modules are programmed with the NI-RFSG driver, which contains
several performance-enhancing characteristics. Using an optimized driver
stack combined with fast-settling VCO-based hardware, you can tune an
NI PXIe-5673/5673E to 0.1 ppm of its settling frequency with a typical tuning
time of less than 1.5 ms. With the NI PXIe-5673E, a wide-loop bandwidth
configuration results in tuning times to within 0.1 ppm of the final frequency
in under 300 µs.
You also can use the NI-RFSG driver to enhance the RF performance. With
an RF impairments API, you can manually or programmatically adjust I/Q
impairments such as gain imbalance, DC offset, and quadrature skew.
A LabVIEW property node that illustrates how you can adjust these parameters
on the fly is shown in Figure 8.
Figure 6. Constellation Plot of QPSK with 50 MHz of Bandwidth
In Figure 6, a center frequency of 825 MHz was used. The RF power was set
to -10 dBm and analysis was performed with the NI PXIe-5663. While an EVM
of 0.9 percent is a nominal value, the typical result is 1.1 percent.
In addition, the combination of high dynamic range and a linear front end
yields high-performance adjacent channel power measurements. In Figure 7,
observe the spectrum for a QPSK signal at 1 GHz center frequency.
Figure 8. RFSG Impairments Property Node
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3
Vector Signal Generator
Typical out-of-the-box image and carrier suppression is better than -60 dBc,
but you can reduce suppression to better than -80 dBc for a particular frequency
and temperature by adjusting quadrature impairments through the RFSG VQ
impairments API. Figure 9 illustrates the carrier suppression at 1 GHz for a
10 MHz tone.
Ordering Information
NI PXIe-5673
128 MB onboard memory...............................................................780418-01
512 MB onboard memory...............................................................780418-02
NI PXIe-5673E
128 MB onboard memory...............................................................781263-01
512 MB onboard memory...............................................................781263-02
Phase Coherent VSGs
NI PXIe-5673/5673E VSG channel extension kit ...........................780485-01
NI PXIe-5673E two-channel VSG...................................................781340-02
NI PXIe-5673E three-channel VSG.................................................781340-03
NI PXIe-5673E four-channel VSG...................................................781340-04
BUY NOW
For complete product specifications, pricing, and accessory information,
call 800 813 3693 (U.S.) or go to ni.com/pxi.
Figure 9. Use the impairments API to reduce image and carrier suppression.
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4
Vector Signal Generator
Specifications
2
0
Frequency
Frequency Range
85 MHz to 6.6 GHz
85 MHz to 3.3 GHz
85 MHz to 1.3 GHz
NI PXIe-5673 Part Number
780418-0X
–2
–4
–6
–8
–10
780417-0X
780416-0X
Note: NI PXIe-5673 part numbers vary according to memory size.
Bandwidth
Modulation bandwidth
–200 –150 –100
–50
0
MHz
50
100
150
200
(3 dB double sideband).......................... >100 MHz
The modulation bandwidth specification assumes the frequency range is between
85 MHz and 6.6 GHz. For example, 100 MHz bandwidth can be achieved at a
frequency of 135 MHz but not 85 MHz.
Figure 3. Typical Modulation Bandwidth at 5.8 GHz Carrier Frequency
Data streaming continuous
transfer rate...................................... 500 MB/s, nominal
2
0
Tuning Resolution (NI 5650/5651/5652)
<1.3 GHz................................................ <1 Hz
≤1.3 to ≤3.3 GHz.................................... <2 Hz
≤3.3 to ≤6.6 GHz.................................... <4 Hz
–2
–4
–6
–8
–10
Frequency Settling Time
0.1 x 10-6 of final frequency................... <7.5 ms, maximum
0.1 x 10-6 of final frequency................... <3.5 ms, typical
The frequency settling time specification includes only frequency settling and
excludes any residual amplitude settling that may occur as a result of large
frequency changes.
–200
–150
–100
–50
0
50
100
150
200
MHz
Figure 1. Typical Modulation Bandwidth at 1 GHz Carrier Frequency
In figures 1 through 5, typical modulation bandwidths show the actual baseband
response. The usable bandwidth is limited by the NI 5450 I/Q generator sample
rate from -80 to 80 MHz. The shaded area between the solid lines indicates the
frequency range covered by this specification.
Internal Frequency Reference (NI 5650/5651/5652)
Frequency.............................................. 10 MHz
Initial accuracy...................................... 3 x 10-6
Temperature stability (15 to 35 ˚C) ....... 1 x 10-6, maximum
Aging
2
0
Per year............................................. 5 x 10-6, maximum
–2
–4
–6
–8
–10
External Reference Input (NI 5450)
Frequency.............................................. 10 MHz
Amplitude.............................................. 1.0 Vpk-pk to 5.0 Vpk-pk into 50 Ω
Input impedance.................................... 50 Ω
Coupling ................................................ AC
–200 –150 –100
–50
0
MHz
50
100
150
200
External Reference Output (NI 5450)
Frequency.............................................. 10 MHz
Reference clock out............................... 0.7 Vpk-pk into 50 ½, nominal
Output impedance................................. 50 ½
Figure 2. Typical Modulation Bandwidth at 2.4 GHz Carrier Frequency
Coupling ................................................ AC
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5
Vector Signal Generator
Spectral Purity
Sideband Image Suppression
Frequency
100 MHz
500 MHz
1 GHz
Phase Noise (dBc/Hz)
2 MHz Modulation
Bandwidth
20 MHz Modulation
Bandwidth
Frequency
<-125
<-112
<-105
<-98
≥85 MHz to ≤400 MHz
>400 MHz to ≤2.5 GHz
>2.5 GHz to ≤5.5 GHz
>5.5 GHz to ≤6.6 GHz
≤-43 dBc
≤-50 dBc
≤-46 dBc
≤-43 dBc
≤-41 dBc
≤-48 dBc
≤-45 dBc
≤-41 dBc
2 GHz
3 GHz
<-95
Note: Measured with a test signal at a baseband frequency of 1 MHz.
4 GHz
<-93
5 GHz
<-90
–
–42
6.6 GHz
<-90
–44–
–
–
–
–
–46
–48
–50
–52
Table 1. Single Sideband Phase Noise at 10 kHz Offset
–
–50
–54–
–
–56
–60 –
–70 –
–80 –
–90 –
–58–
–
–
–60
–62
–64–
–
–
–
–
–66
–68
–70
–72
–
–
–
–
–
–100
–110
–120
–130
–140
–74–
–
–
–
–76
–78
–80
1 GHz LO
2.4 GHz LO
5.8 GHz LO
–82–
–80M –70M –60M –50M –40M –30M –20M –10M
Baseband Frequency (Hz)
0
10M 20M 30M 40M 50M 60M 70M 80M
–150 –
10
100
1k
10k
100k
1 M
10 M
Frequency Offset from Carrier (Hz)
2.4 GHz
1 GHz
5.8 GHz
Figure 6. Typical Image Rejection versus Baseband Frequency
Figure 4. Typical Phase Noise at 1, 2.4, and 5.8 GHz
Carrier Suppression
LO Frequency
85 MHz to 5.5 GHz
5.5 GHz to 6.6 GHz
Carrier Suppression
–
–50
-44 dBc, maximum
-41 dBc, maximum
–60 –
–70 –
–80 –
–90 –
–100 –
–
–
–
0
–5
–
–
–
–
–110
–120
–130
–140
–150
–10
–15–
–20–
–
–
–
–
–25
–30
–35
–40
–
10
100
1k
10k
100k
1 M
10 M
Frequency Offset from Carrier (Hz)
5.8 GHz using internal
10MHz reference clock
5.8 GHz using 10MHz
backplane reference clock
5.8 GHz using external 10MHz reference
clock across NI 5663 front panel
–45–
–
–
–
–
–
–50
–55
–60
–65
–70
Figure 5. Typical Phase Noise at 5.8 GHz
85M
1G
2G
3G
4G
5G
6G
6.6G
Carrier Frequency (Hz)
Figure 7. Typical Carrier Suppression
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6
Vector Signal Generator
Digital Modulation1
(Nominal)
Quadrature Phase-Shift Keying (QPSK)
EVM (%)
MER (dB)
3,400 MHz
Symbol Rate
(MS/s)
Root Raised Cosine
Filter Alpha Value
Bandwidth
825 MHz
3,400 MHz
5,800 MHz
825 MHz
5,800 MHz
Onboard Reference Clock Source
0.16
0.80
4.09
200.00 kHz
0.25
0.22
0.25
0.3
0.4
0.6
0.7
0.7
0.8
1.0
1.0
1.2
51
48
45
43
42
42
40
40
38
1.00 MHz
4.98 MHz
QPSK, External Reference Clock Source (PXI Express Backplane Clock)
0.16
0.80
4.09
200.00 kHz
1.00 MHz
4.98 MHz
0.25
0.22
0.25
0.7
0.9
1.1
2
2.9
1.7
1.5
43
41
39
34
38
38
30
36
36
1.3
1.3
16-QAM, Onboard Reference Clock Source
17.6
32.0
22 MHz
40 MHz
0.25
0.25
0.7
1.1
1.4
2.4
1.8
2.5
41
36
35
29
32
29
16-QAM, External Reference Clock Source (PXI Express Backplane Clock)
17.6
32.0
22 MHz
40 MHz
0.25
0.25
1
1.5
2.5
1.9
2.6
37
35
34
29
32
29
1.4
64-QAM, Onboard Reference Clock Source
5.36
6.95
6.16 MHz
7.99 MHz
50.00 MHz
0.15
0.15
0.22
0.4
0.5
1.3
0.6
0.7
2.8
1
1
44
43
34
40
39
27
37
36
28
40.99
2.6
64-QAM, External Reference Clock Source (PXI Express Backplane Clock)
5.36
6.95
6.16 MHz
7.99 MHz
50.00 MHz
0.15
0.15
0.22
0.9
0.9
1.5
1
1.2
1.2
2.7
38
38
33
36
36
27
35
35
28
1.1
2.8
40.99
256-QAM, Onboard Reference Clock Source
6.95 7.99 MHz
0.15
0.5
0.8
0.8
2
1.8
2.3
43
37
38
32
32
29
256-QAM, External Reference Clock Source (PXI Express Backplane Clock)
6.95 7.99 MHz 0.15
1All measurements were made with an NI 5673 and NI 5663 not phase-locked together.
Number of symbols = 1,250 pseudorandom bit sequence (PRBS) at -30 dBm for all measurements.
No equalization in receiver demodulation.
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7
Vector Signal Generator
–
–
–
–
–
–
–
–
20
30
40
50
60
70
80
90
The specifications in figures 8 through 11 were measured under the
following conditions:
◾◾
Modulation: QPSK
◾◾
Symbol rate: 3.84 MS/s
◾◾
Filter: root raised cosine with alpha value of 0.22
◾◾
Filter length: 128 symbols
–100
◾◾
RF power: set to -10 dBm
–110
◾◾
812M
814M
816M
818M
820M
822M
824M
826M
828M
830M
832M
834M
836M
838M
Prefilter gain: set to -5 dB
Frequency (Hz)
◾◾
Number of averages by receiver: 100
Figure 8. Typical Adjacent Channel Power at 825 MHz
◾◾
Noise cancellation: On
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
2.39G
2.392G
2.392G
2.396G
2.398G
2.4G
2.402G
2.404G
2.406G
2.408G
2.41G
Frequency (Hz)
Figure 9. Typical Adjacent Channel Power at 2.4 GHz
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
3.388G 3.39G 3.392G 3.394G 3.396G 3.398G
3.4G
3.402G 3.404G 3.406G 3.408G 3.41G 3.412G
Frequency (Hz)
Figure 10. Typical Adjacent Channel Power at 3.4 GHz
–20
–30
–40
–50
–60
–70
–80
–90
–100
–110
5.988G
5.99G
5.992G 5.994G 5.996G 5.998G
6G
6.002G 6.004G 6.006G 6.008G
6.01G
6.012G
Frequency (Hz)
Figure 11. Typical Adjacent Channel Power at 5.8 GHz
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