5. Dual ARB: Baseband Frequency Offset (EXT)
Range: 1 KHz to 125 MHz
Default: 100 MHz
The sample clock rate of the instrument is automatically calculated by the software.
For Carrier Aggregation (with a single component carrier) the following ARB Sample Clock rates apply:
| Bandwidth of the Component Carrier (CC) | ARB Sample Clock1, 2 |
| 1.4 MHz | 1.92 MHz |
| 3 MHz | 3.84 MHz |
| 5 MHz | 7.68 MHz |
| 10 MHz | 15.36 MHz |
| 15 MHz | 23.04 MHz |
| 20 MHz | 30.72 MHz |
| 1 The same ARB Sample Clock rates apply to exported waveforms too. | |
| 2 For this table's CC bandwidth vs. ARB Sample Clock values to apply, the Frequency Offset parameter must equal 0. | |
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: 92%
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.
This parameter is not available for all instrument model numbers and may be grayed out.
Choice: Auto | 40 MHz | Through
Default: Auto
Double-click or use the drop-down menu to select an I/Q output filter value.
This parameter is not available for all instrument model numbers and may be grayed out.
Choice: Auto | Manual
Default: Auto
Set the modulation attenuation mode for the I/Q modulator to automatic or manual.
– the signal generator optimizes the modulation attenuation for the current conditions.
– applies the value set in the cell.
Range: 0 to 40 dB (minimum increment 0.01 )
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.
Set the Modulation Attenuation Mode to to enable this parameter.
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 grayed 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 grayed 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 grayed out.
Range: -50.00 MHz to 50.00 MHz
Default: 0.000 Hz
Set to to enable this parameter.
Enter a frequency value by which the baseband frequency is offset relative to the carrier. This parameter is only available when connected to the E6607 EXT.