R&S®SMU200A Vector Signal Generator

The art of signal generation

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Intuitive operation

The R&S®SMU200A is equipped with a modern and intuitive user interface. The signal flow from the baseband to the RF output is clearly shown in the block diagram. Each block represents a functional unit of the instrument. The generated signal can be seen at a glance, and whether it is affected by additive white Gaussian noise and/or fading.

In the example a LTE 2x2 MIMO signal is generated by the R&S®SMU200A Vector Signal Generator
In the example two telecommunication standards are generated by one R&S®SMU200A vector signal generator: One LTE signal plus additive noise in the upper path and one faded Wcdma signal in the lower path

Active windows are indicated by a labeled button in the Winbar at the bottom of the screen. With the softkey below, the respective window can be quickly brought to the foreground. This allows rapid navigation between different windows. It is possible, for instance, to simultaneously display two slots of a GSM/EDGE system and to toggle between them. Windows can of course also be automatically arranged (REARR), hidden (HIDE) or closed (CLOSE) by means of hardkeys.

The baseband signal can be monitored in the graphics block. For instance, the vector or constellation diagram, the I/Q characteristic or the output spectrum of a signal can be displayed, making it possible to check whether the generated signal corresponds to the required signal. This is of great help particularly when complex signals are produced.

Another outstanding feature of the R&S® SMU200A is its context-sensitive online help. If the exact function of a parameter s not known, simply pushing the help key instantaneously displays a help text with information about the selected parameter. Further information can be obtained through navigation with a browser-like system. The help system also specifies the relevant remote-control commands. Full-text searching in the help system, which contains the complete operating manual, comes in handy when complex measurement tasks are to be performed. Tool tips are provided in addition. If you pause on a parameter, the currently permissible setting range is displayed.

Outstanding signal quality
Typical SSB phase noise at 100 MHz, 850 MHz, 2.1 GHz and 5.7 GHz with internal reference oscillator (without low phase noise option)

Owing to the sophisticated multiloop synthesizer concept, the R&S®SMU200A features extremely low SSB phase noise and wideband noise. A high-stability oven-controlled reference oscillator is installed as standard, which provides excellent aging characteristics as well as minimum temperature drift. The R&S®SMU200A is ideal, for instance, for LO or VCO substitution.

Outstanding ACLR characteristics

Amplifiers of 3GPP base stations require very good adjacent channel leakage ratio (ACLR) performance in order not to impair the adjacent channels of the transmission. To test this feature, the ACLR characteristics of the signal generator must be better than those of the amplifier. Presently, multicarrier power amplifiers are increasingly used. In this case, not only one but several neighbouring signals in the frequency range are amplified. Testing such amplifiers places even higher demands on signal generator capabilities. The outstanding ACLR characteristics of the R&S®SMU200A more than qualify the generator for this task.

When external I/Q signals are applied, the R&S® SMU200A features an RF bandwidth of 200 MHz. If the internal baseband is used, an RF bandwidth of 80 MHz is available, which is ideal for testing multicarrier amplifiers. The R&S® SMU200A is thus well prepared for future broadband systems.

The R&S® SMU200A offers highly accurate output power of up to +13 dBm (PEP). A wear-and-tear-free electronic attenuator is used in the full level range. With the aid of the high-power output option, the output power can be increased to +26 dBm (PEP) in the overrange.

Digital ALC implemented in the R&S® SMU200A together with a detector operating at constant temperature ensures high level linearity and repeatability. ALC may be on for most kinds of complex signal scenarios.

Unrivalled flexibility
Four code channels in realtime with additive background channels

The standards of the third mobile radio generation set considerably higher demands on signal generator functionality. Because of their good RF characteristics and their flexibility, signal generators are the instrument of choice particularly when base stations are tested. The universal coder in the baseband generator of the R&S®SMU200A has been designed for easy implementation of new standards. The R&S®SMU200A is therefore well prepared for present and future mobile radio standards.

In the case of 3GPP FDD, the R&S® SMU200A can generate up to four code channels in realtime. Up to four base stations with 128 code channels each or four mobile stations can be simulated. This allows any configuration to be set, from reference measurement channels in line with 3GPP TS 2 5.141 or TS 2 5.101 up to complex code channel scenarios for traffic simulation in the mobile radio network.

Furthermore, the R&S® SMU200A supports the mobile radio standards LTE, LTE-Advanced, GSM/EDGE/EDGE Evolution, TD-SCDMA, CDMA2000, as well as the wireless standards WLAN IEEE 802.11 a/b/g/n/ac, and many more. For more information, see the pages of the respective options (section Digital Modulation Systems in the Options tab).

Up to two signal generators in one

All the strengths of the two-path concept of the R&S®SMU200A become especially evident in the field of mobile radio. Since the baseband section of the R&S®SMU200A is fully digital, the signals of the two baseband generators can be easily added without synchronization problems and without an external coupler or additional equipment being required. A frequency offset and the relative power of each signal can be accurately set.

Adding a realtime signal and a multicarrier signal

For receiver tests in multicarrier base stations with complex interfering signals, one baseband generator can produce the test signal to be evaluated. The second baseband generator produces a suitable multicarrier signal to be used as the background signal. Two transmit antennas (the transmit diversity) of a base station can also be simulated. Up to now, two signal generators have been required in this case, but only one instrument is needed when the R&S®SMU200A is used.

Generation of wanted signal and interfering signal

If the RF section is furthermore equipped with two paths, any requirement can be met. For instance, the wanted signal and the interfering signal needed for receiver tests can be generated with one instrument – even if the signals greatly differ in power and frequency offset as is the case when out-of-band blocking measurements are to be performed.

Ideal for production
Setting time after frequency change (list mode)

Short turnaround times and short test times are important particularly for automatic test sequences in production. Short setting times of a signal generator mean money in hand. The R&S®SMU200A with its very short frequency setting time of <2 ms meets all requirements. In the List mode, where frequency variations have previously been stored in a list, the setting time is reduced to <450 μs. A built-in electronic attenuator ensures wear-and-tear-free switching. This prevents down-times for replacing mechanical attenuators.

Connectivity
Remote control of the R&S® SMU200A via IEEE bus or LAN

Remote control

The R&S®SMU200A is remote-controlled via GPIB or LAN. When the Windows Remote Desktop is used, the instrument can be remote-operated from a PC.

R&S SMU200A Front Panel

Front panel

An external keyboard and a mouse or memory stick can be plugged to the USB connectors on the front panel. Two marker outputs that can be used as required and a trigger input are available in addition.

  • Rear panel

A LAN (100BaseT) and a GPIB interface as well as a USB slave connector are available at the rear. Using the slave connector, the R&S®SMU200A can be directly connected to a PC, e.g. for loading firmware updates in a fast and convenient way. Even modulation data from a PC can be fed in via this connector. An external monitor or a video projector can be connected to the VGA connector.

Modular design
Synthesizer module of the R&S®SMU200A

Future-oriented

Owing to its modular design, the R&S®SMU200A is a safe investment. Options can be added any time. This concept allows the R&S®SMU200A to be tailored to specific applications.

  • Convenient service

“Low cost of ownership” is more than just a motto – it is a comprehensive concept. The three-year calibration cycle considerably reduces costs. A thermal management system with oversized fans combined with large-scale integration ensures high reliability even under adverse environmental conditions. Rohde & Schwarz Service Centers all over the world reduce transit times in the case of repair and ensure short turnaround times.

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