Choices: Input, Output
Displays the function of the I/O block in the block diagram. This read-only parameter displays Output because this I/O block is used as an output in the block diagram.
Choices: Analog, Digital
Displays the port type being used by the I/O block to pass I/Q samples to the connected external instrument. This is a read-only parameter displays either analog and digital mode depending on the I/O port type that was selected when the external instrument was assigned to the configuration. The same port cannot be used in both analog and digital mode simultaneously because they operate at different clock rates.
Choices: On, Off
Default: Off
Dependency: Displayed only when the I/O port type is set to Digital
Turns on the PXB's digital bus port which is located on the I/O card. This selection may be changed even while the waveform is playing. Turning this off while the PXB is playing causes the output of the signal generator to revert to CW. Internally, the PXB continues to play normally.
Choices: On, Off
Default: Off
Dependency: Displayed only when the I/O port type is set to Analog
Turns on the PXB's analog ports which are located on the I/O card. All analog I/O connectors for this port are enabled or disabled with this setting. This selection may be changed even while the waveform is playing. Turning this off while the PXB is playing causes the output of the signal generator to revert to CW. Internally, the PXB continues to play normally.
Range: 0 to 100 %
Default: 100 %
Resolution: 0.01 %
Adjusts the scaling of a composite waveform's I and Q data values while the waveform is playing. This adjustment is applied to waveforms as they are seen in the PXB's output I/O block and provides flexibility to scale signals after they have been summed together, to reduce DAC overflows and clipping should they occur. Runtime scaling does not alter the waveform file.
Range: –80
MHz to 80 MHz (±40 % of the sample rate)
Default Value: 0 Hz
Resolution: 0.01 Hz
Shifts the baseband frequency up to ±80 MHz from the center frequency. This setting provides the flexibility to offset waveforms that were summed within the output I/O block. The full 80 MHz may not always be available, since it depends upon the clock rate of the final output device when connected digitally.
Range: –2000 ps to 2000 ps
Default: 0 ps
Resolution: 1 ps
Provides a high-resolution relative time delay correction between the I and Q signals. This is used to compensate for small timing errors due to different path lengths, or to introduce impairments.
A positive value delays the I signal relative to the Q signal, and a negative value delays the Q signal relative to the I signal. The different signal paths traveled by the I and Q signals result in time delay differences. Adding an equal and opposite time delay (skew) in the I/Q signals during baseband generation eliminates the time delay error, correcting for any delays in signals that are generated in the internal baseband generator.
Range: –4 to 4 dB
Default: 0 dB
Resolution: 0.01 dB
Adjusts the I signal amplitude relative to the Q signal amplitude. Use this as an internal impairment, or to compensate for differences in signal path loss in the external cabling.
This selection may be changed even while the waveform is playing.
Range: 0 to 10.245 µs
Default: 1 ns
Resolution: 1 ps
Changes the timing delay of both the I and Q signals with respect to triggers, markers, and other channels. This selection may be changed even while the waveform is playing.
Range: –30 to 30 degrees
Default: 0 degrees
Resolution: 0.01 degrees
Adjusts the phase of the Q signal relative to the phase of the I signal. When the quadrature skew is zero, the phase angle between the I and Q vector is 90 degrees. Positive skew increases the angle from 90 degrees while negative skew decreases the angle from 90 degrees. This function is not affected by changes in clock rate.
This selection may be changed even while the waveform is playing.
Range: –
2.5 V to 2.5 V
Default Value: 0.0 V
Resolution: 0.01 V
Dependency: Displayed only when the I/O port type is set to Analog
Adjusts the DC offset of both I and Q signals simultaneously.
This selection may be changed even while the waveform is playing.
Range: –0.25 V to 0.25 V
Default Value: 0.0 V
Resolution: 0.001 V
Dependency: Displayed only when the I/O port type is set to Analog
Adjusts the DC offset level of the I output signal between +I and –I.
This selection may be changed even while the waveform is playing.
Range: –0.25 V to 0.25 V
Default Value: 0.0 V
Resolution: 0.001 V
Dependency: Displayed only when the I/O port type is set to Analog
Adjusts the DC offset level of the Q output signal between +Q and –Q.
This selection may be changed even while the waveform is playing.
Range: 0
V to 1.14 V
Default Value: 650mV
Resolution: 0.01 V
Dependency: Displayed only when the I/O port type is set to Analog
Sets the maximum (peak) voltage level of the analog I/Q output signals. The minimum level of I/Q signals is assigned the additive inverse of that value.
This selection may be changed even while the waveform is playing.
AWGN Settings
Marker Selection
AWGN Graphics