niRFSG Configure Signal Bandwidth VI

niRFSG Configure Signal Bandwidth VI

Configures the signal bandwidth of the arbitrary waveform. The NI-RFSG device must be in the Configuration state before you call this VI.

Supported Devices: PXIe-5644/5645/5646, PXI-5670/5671, PXIe-5672/5673/5673E, PXIe-5820/5830/5831/5832/5840/5841/5842/5860

Details Examples

	instrument handle identifies your instrument session. instrument handle is obtained from either the niRFSG Initialize VI or the niRFSG Initialize With Options VI.
	signal bandwidth specifies the signal bandwidth used by NI-RFSG for generating an RF output signal. NI-RFSG sets the Signal Bandwidth (Hz) property to this value.
	error in describes error conditions that occur before this node runs. This input provides standard error in functionality.
	instrument handle out passes a reference to your instrument session to the next VI. instrument handle out is obtained from the niRFSG Initialize VI or the niRFSG Initialize With Options VI.
	error out contains error information. This output provides standard error out functionality.

Details

NI-RFSG defines signal bandwidth as twice the maximum baseband signal deviation from 0 Hz. Usually, the baseband signal center frequency is 0 Hz. In such cases, the signal bandwidth is simply the baseband signal's minimum frequency subtracted from its maximum frequency, or f_max - f_min. NI-RFSG uses this value to optimally configure the center frequency of the upconverter to help minimize phase noise. The generated signal is not filtered to achieve the set bandwidth. However, specifying a bandwidth smaller than the actual bandwidth of the signal could potentially result in spectral distortion.

Note  Based on your signal bandwidth, NI-RFSG may configure the upconverter center frequency on the PXI-5670/5671 or PXIe-5672 in increments of 1 MHz or 5 MHz. Failure to configure signal bandwidth may result in the signal being placed outside the upconverter passband.

Examples

Refer to the following VIs for examples of using the niRFSG Configure Signal Bandwidth VI.

  • RFSG Getting Started Finite Generation VI: labview\examples\instr\niRFSG

  • RFSG Getting Started Script (Script) VI: labview\examples\instr\niRFSG

  • RFSG Arbitrary Waveform Generation (Arb) VI: labview\examples\instr\niRFSG