This mode controls the playback sequence of waveform segments that have been written into the Arb memory located on the internal baseband generator. These waveforms can be generated by the internal baseband generator using the Custom Arb Waveform Generator mode, or downloaded through a remote interface into the Arb memory. Dual Arb modulation is only available on vector models.
Note: Parameter choices vary by instrument. Some of the parameters listed below might not be available on your particular instrument. The bench application will list only those parameters, and parameter ranges, available for your particular instrument.
To enable the Dual Arb mode, select the "On" button.
Arb Name – Select the waveform or secured waveform file from non–volatile waveform memory (NVWFM) and load it into volatile waveform memory (WFM1) of baseband generator (BBG) media. Associated marker and header files, if present, are also loaded. If available, you also can load a file from the instrument's internal memory or you can access an external USB drive to load a waveform file.
Waveforms must reside in BBG media before they can be played. Cycling power or rebooting the signal generator deletes the files in BBG media.
Note: The file types currently supported include waveform files and encrypted secured waveform files.
Sample Rate – Set the sample clock rate for the dual Arb format.
Runtime Scale – Set the runtime scaling percentage which scales the waveform data during playback. Note that runtime scaling does not affect the stored data.
In this mode, you can apply Additive White Gaussian Noise (AWGN) to a carrier in real time. To enable AWGN operation, select the "On" button.
Carrier Power – Set carrier power level.
Noise Bandwidth – Set the bandwidth of the noise.
Carrier Bit Rate – Set the bit rate of the carrier.
Carrier Bandwidth – Set the carrier bandwidth over which the AWGN is applied.
C/N Ratio Format – Select either the Carrier-to Noise-Ratio (C/N) or Energy per Bit over Noise power density at the receiver (Eb/No) as the variable controlling the ratio of carrier power to noise power in the carrier bandwidth.
C/N – Set the Carrier-to-Noise ratio, in dB.
In this mode, you degrade the phase noise performance of the signal generator by controlling two frequency points and an amplitude value. The signal generator adds this phase noise to the phase noise normally produced by the signal generator. To enable phase noise operation, select the "On" button.
Start Frequency – Set the start frequency value of the flat area for the phase noise impairment.
Stop Frequency – Set the stop frequency value of the flat area for the phase noise impairment.
Desired Flat Amplitude – Set the level amplitude of the flat area for the phase noise impairment. This phase noise is added to the base phase noise of the signal generator.