THE R&S AFQ100A I/Q modulation generator has maximum signal quality and flexibility for R&D and production.
The R&S AFQ100A I/Q modulation generator from Rohde & Schwarz excels by providing a memory clock of 300MHz combined with a memory depth of up to 1G/sample.
The R&S AFQ100A is ideal for use in R&D and production when the generation of complex digital modulation signals is needed.
The device is available with an output memory of 256M/sample or 1G/sample - in addition to analogue outputs, it can also be fitted with a digital I/Q output.Modern communications technologies use a wide variety of digital modulation methods. To achieve higher data rates, new modulation methods are continuously being developed.
As a result, a flexible modulation source that generates these complex signals is required for tests in R&D and production.
Owing to its variable memory clock rate of 1kHz to 300MHz and large memory depth of up to 1G/sample, the R&S AFQ100A is ideally suited for these applications.
It allows I/Q signals with an RF bandwidth of up to 200MHz to be generated, thus also supporting the requirements of future broadband communications systems.
The R&S AFQ100A comes with an unbalanced analogue output that has a level that can be set between 0V to 1.5V and a balanced output that has a level varying between 0V and 3V.
A bias voltage of -2.5V to +2.5V may additionally be superimposed on the signal at the balanced output.
Plus, the R&S AFQ100A can be equipped with digital outputs that offer 16 bit resolution and support a maximum data rate of up to 300MHz.
The R&S AFQ100A achieves outstanding signal quality at an S/N ratio of typ. 83dBc and a frequency response of typ. 0.05dB across the entire bandwidth.
The generator also features various trigger functions - the output signal can be adjusted in various ways to compensate for impairments, for example. If necessary, the internal equaliser changes the output signal in realtime, compensating for external frequency responses of I/Q modulators, for example.
As an independent baseband source, the R&S AFQ100A provides the DUT with I/Q signals directly via an analogue or digital output.
In conjunction with a vector signal generator, the R&S AFQ100A also generates the appropriate RF signals. The signal data can be output from the memory at a user-adjustable clock rate. Users can select a very small clock rate to achieve maximum signal duration.
Since there is no link to a specific part of the memory, the signal sequence length can be user-defined.
The Multi Segment Waveform function allows fast switchover between the different signal sequences stored in the memory. This feature is of special interest when testing a DUT with different signals.
In addition, the Multi Segment Waveform function allows applications with baseband hopping to be performed. The deep memory also generates very long sequences for measuring the bit error ratio.
The signals are generated on a PC using the R&S WinIQSIM2 software supplied with the R&S AFQ100A, or directly via the conventional MATLAB PC software. R&S WinIQSIM2 provides ready-made packages for a large number of communications standards.
The R&S AFQ100A can be controlled via GPIB, USB and LAN (Gigabit Ethernet) or operated as a standalone instrument by using the integrated video, mouse and keyboard interface.