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| | | | | | | | | | | | | | | | | | | | | | | | | | | system to raise the sampling rate of the file. This ensures the generation of low adjacent channel power and low spectral noise density. The dual channel ARB is suited for the generation of both narrow band and wideband signals, including WCDMA signals, without the use of switched reconstruction filters. Combining a large ARB memory with the smaller file size required to define a waveform allows the ARB to store up to 180 waveforms. Alternatively the whole of the memory can be devoted to a single file. One such file would store over 1.5 seconds of a 3GPP WCDMA waveform signal. The use of interpolation techniques ensures that when narrow band systems are simulated the waveform generator can still operate at a high sample rate without requiring excessively large amounts of data to be loaded or restricting the repetition time. The library waveforms are structured in a directory form to ease their selection and the optimization of the user's generator. The modulation waveforms can be simply changed by selection from a file list with the changeover between waveforms occurring in a few milliseconds rather than the many seconds required in more traditional waveform generators. The file name can be determined by the user to convey a useful description of the contents of the file. Real Time Baseband Generator Fitted internally, the optional Real Time Baseband, RTBB, generates baseband signals (I and Q) that modulate an RF source in real time to produce generic FSK, PSK and QAM signals at rates up to 2 Msymbols/sec. The RTBB generates or inputs a set of modulation symbols, modulates them with the chosen scheme, filters them using an appropriate channel filter, and then converts the digital stream to analogue I and Q for the I/Q vector modulator. The source of the symbol data is very flexible. The symbol data can originate from a variety of internal or external sources. Internal data source choices include a PRBS generator, an internal pattern generator or internal memory storage of user downloaded symbols. External real-time symbol data can be input in serial or parallel format via an industry standard Low Voltage Differential Signalling (LVDS) interface. Digitized I/Q data, available from sources such as basestation simulators, can be input via the LVDS interface as an alternative to external parallel or serial symbol data. Streaming digitized I/Q data samples are available as an output via the LVDS interface from internally generated symbols for testing D/A convertors. Synchronized clock, RF Burst, RF Burst Attenuation control and marker output signal facilities are available for both internal and external data generation. An important feature necessary to support GSM signal generation is the ability to frequency hop between channels. The RTBB option provides frequency hopping by re-mixing the I and Q data at baseband. The resultant I and Q vectors then modulate the core synthesizer frequency thus producing a new RF frequency at the output of the signal power pack. This method ensures that synchronization is maintained between the IQ data and the hop trigger. In addition, because the main synthesizer hardware remains unchanged, fre | | | | | | lOCreator is a Windows based software utility that enables a user to set up a modulation scheme and then create an ARB file using modulation templates. The resulting file may be saved on a PC or downloaded into the ARB. User-defined configurations can also be saved. Consequently, it is possible to load previously saved setups to regenerate the ARB files quickly and easily. The capabilities of lOCreator include:- Generic Modulation Types PSK, FSK, MSK, QAM modulation types Nyquist, Root Nyquist and Gaussian filters PRBS, fixed pattern and user defined data sources IQ errors - residual carrier, IQ imbalance, quadrature offset Multi-carrier | | | | | | | | | | Also included are 2G, 2.5G and 3G cellular TDMA and CDMA digital standards along with WLAN and other cordless phone standards. In addition, lOCreator includes a utility that allows user-defined waveforms, created using software simulation tools such as MATLAB, to be converted and packaged into a form that can be downloaded into the 3410 Series ARB. 12345® is continually updated to include new modulation capabilities and facilities. The latest version is available for download at www.aeroflex.com/IQCreator. | | | | | | | | | | Options to have an instrument's ARB pre-loaded with a suite of example waveform files are available. A selection of waveforms from each of the standards, or just waveforms relevant to the user's applications, can be chosen. Although only available at the time of order, all the waveforms are available within IQCreator should any of the files be deleted then required in the future. I/Q Outputs Single ended baseband I/Q outputs are available as standard. Differential I/Q outputs, combined with comprehensive voltage bias and offset facilities, are optionally available to simplify component and module testing. Pulse Modulator An optional pulse modulator allows the generation of fast rise time RF signals with on/off ratios that meet the most demanding radar and ECM/ECCM test applications. The 3410 series include both fast GPIB and Ethernet remote control interfaces for flexibility in production environments. RS-232 control is also provided for use in legacy ATE systems. The protocol and syntax of the GPIB commands have been designed in accordance with IEEE 488.2 to simplify program generation. Plug and play drivers are available that include a virtual front panel for remote instrument supervision and debug. The 3410 series includes a high stability OCXO as standard. The inclusion of a main input power standby mode maintains the oscillator at working temperature while the rest of the instrument is powered down. Time to full specification working is thereby minimized for equipment facilities held on standby. | | | | | | | | | | I^U.V^l±V^ O LCI lOCreator: | | bilization is nearly instantaneous. | | | | | | | | | | | | | | The 3410 series is supplied with a free copy of lOCreator , a software package to aid the creation and download of files to the ARB and RTBB options. | | | | | | | | | | | | | | www.aerotlex.com | | | | | | For the very latest specifications visit | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | |
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