The sample clock rate of the instrument is automatically calculated by the software. The ranges vary on the connected instrument
Choice: Internal | External
Default: Internal
Double-click or use the drop-down menu to select the signal generator’s VCO Clock.
- the signal generator uses its internal VCO Clock.
- the signal generator uses an external VCO Clock
This parameter is not available for all instrument model numbers and may be grayed out.
Range: 1 to 100% (100% = no scaling)
Default: 70%
Enter a scaling value for the signal generator to apply to the waveform while it is playing. Use scaling to get the best dynamic range without overflowing the I and Q digital-to-analog converters (DAC) and to reduce the overshoot associated with the DAC interpolation filter. Waveform Runtime Scaling does not change the data in the waveform file.
Choice: Auto | 2.1 MHz | 40 MHz | Through
Default: Auto
Double-click or use the drop-down menu to select an I/Q modulation filter value. The bandwidth of the baseband signal should dictate the minimum reconstruction filter bandwidth that you choose. Depending on the oversampling ratio and where the image frequencies appear, you may want to select a wider bandwidth.
▪ Auto − automatically selects a digital modulation filter.
▪ 2.1 MHz − applies a 2.1 MHz baseband filter to the I/Q signals.
▪ 40 MHz − applies a 40 MHz baseband filter to the I/Q signals.
▪ Through − bypasses filtering.
This parameter is not available for all instrument model numbers and may be greyed out.
Choice: Auto | 40 MHz | Through
Default: Auto
Double-click or use the drop-down menu to select a filter or through path for routing I and Q signals to the rear panel I/Q outputs.
▪ Auto − automatically selects an I/Q output filter.
▪ 40 MHz − applies a 40 MHz baseband filter.
▪ Through − bypasses filtering.
This parameter is not available for all instrument model numbers and may be greyed out.
Choice: Auto | Manual
Default: Auto
Set the modulation attenuation mode for the I/Q modulator to automatic or manual.
– the attenuation level automatically sets to a value for best performance based on the digital modulation settings.
– manually set the attenuation level of the I/Q modulator using the Modulation Attenuation cell.
Range: 0 to 50.00 dB, the limits depends on the instrument types and options.
Step: 0.01 dB
Default: 6.00 dB
Use this parameter to reduce the signal level driving the I/Q modulation block. Adjusting the attenuation may reduce signal distortion and improve the overall dynamic range.
Choice: Off | On
Default: Off
Double-click or use the drop-down menu to enable or disable the signal generator's high crest mode.
– processes high-crest-factor arbitrary I/Q waveforms with less distortion. For crest factors higher than 4 dB, you should reduce I/Q Modulation Attenuation levels by 1 dB for each dB above that level. High crest mode reduces the maximum output level and degrades power level accuracy.
– disables the high crest mode.
This parameter is not available for all instrument model numbers and may be greyed out.
Choice: Internal | External
Default: Internal
Double-click or use the drop-down menu to select the signal generator’s ARB reference source.
– the signal generator uses its internally generated 10 MHz signal as the reference source.
– the signal generator uses an external signal as the reference frequency for the baseband I/Q signal. See the signal generator’s user’s guide for information on external references.
This parameter is not available for all instrument model numbers and may be greyed out.
Range: 0.250 to 100 MHz
Default: 10.00 MHz
Enter a frequency value when using an externally supplied reference signal. See the signal generator user’s guide for information on external references.
Set ARB Reference to to enable this parameter.
This parameter is not available for all instrument model numbers and may be greyed out.