Specifies the instantaneous bandwidth of the device in Hz. The instantaneous bandwidth is the effective real-time bandwidth of the signal path for your configuration.

Specify the maximum instantaneous bandwidth needed for your measurement. NI-RFSA coerces the actual IF filter to use based on other measurement constraints such as the IF Filter Bandwidth property and the Digital IF Equalization Enabled property.

To change the value that NI-RFSA uses for the maximum size of multispan acquisition subspans, use the FFT Width property.

The Signal Bandwidth, centered at the IQ Carrier Frequency, must fit within the Device Instantaneous Bandwidth, which is centered at the Downconverter Center Frequency.

Note If your application uses the PXIe-5622 IF digitizer, your maximum device instantaneous bandwidth is constrained to 50 MHz or 25 MHz, depending on the digitizer option you purchased. If your application uses the PXIe-5624 digitizer, your maximum device instantaneous bandwidth is constrained by the hardware option you purchased and your FPGA image.

PXI-5661�The PXI-5600 RF downconverter instantaneous bandwidth is 20 MHz.

PXIe-5663/5663E�Your maximum allowed instantaneous bandwidth depends on the downconverter center frequency you use. Refer to the PXIe-5601 RF downconverter overview for more information about instantaneous bandwidth.

Note For the PXIe-5663/5663E, NI-RFSA does not support multispan acquisitions from frequency ranges that correspond with different instantaneous bandwidths. For example, you cannot configure a multispan acquisition that acquires one span from 110 MHz to 120 MHz and a second from 120 MHz to 130 MHz because the instantaneous bandwidth for frequencies above 120 MHz is different than the instantaneous bandwidth for frequencies less than 120 MHz, 20 MHz and 10 MHz respectively.

PXIe-5665�Your maximum allowed instantaneous bandwidth is independent of the downconverter center frequency. Refer to the NI PXIe-5665 Specifications for more information about instantaneous bandwidth.

PXIe-5665 (14 GHz), PXIe-5668—If you have enabled the preselector for the PXIe-5605/5606, the device instantaneous bandwidth value is only a typical specification. For multispan acquisitions, NI-RFSA uses this typical specification as the maximum size for the acquisition subspans.

Note When used with an external digitizer, the PXIe-5603 and the low frequency band of the PXIe-5605 provide a nominal 80 MHz bandwidth at �6 dB. At frequencies greater than 3.6 GHz, the PXIe-5605 provides a typical bandwidth of 47 MHz at �6 dB with the preselector (YIG-tuned filter) enabled.
Note For PXIe-5606 devices, the 765 MHz IF filter is available only at center frequencies above 3.6 GHz.

PXIe-5693—This property is read-only for the PXIe-5693. The value for the device instantaneous bandwidth depends on the value for the RF preselector filter.

PXIe-5694/PXIe-5667—If your application uses the PXIe-5694 as part of an PXIe-5667 spectrum monitoring receiver or the PXIe-5694 as a stand-alone device, NI-RFSA determines the appropriate IF filter to use based on the value that you set for this property.

Note Device instantaneous bandwidths greater than 20 MHz are available only when you bypass all signal conditioning by setting the Signal Conditioning Enabled property to Bypassed.
Device Instantaneous Bandwidth Property Value Frequency Range IF Filter
≤30 kHz (IF Conditioning Downconversion Enabled property set to Enabled) 30 kHz
>30 kHz and ≤400 kHz 400 kHz
>400 kHz and ≤1.4 MHz 1.4 MHz
>1.4 MHz and ≤5 MHz 5 MHz
>5 MHz and ≤20 MHz 20 MHz
>20 MHz (Signal Conditioning Enabled property set to Bypassed) Bypass

PXIe-5644/5645/5646—This property is read-only for the PXIe-5644/5645/5646. Refer to the specifications document for your device for more information about instantaneous bandwidth.

PXIe-5840/5841/5860—Your maximum allowed instantaneous bandwidth depends on the downconverter center frequency you use. Refer to the NI PXIe-5840/5841/5842/5860 Specifications for more information about instantaneous bandwidth. Set this property to select different device instantaneous bandwidths for a given downconverter center frequency. The device instantaneous bandwidth that you select is greater than or equal to the requested instantaneous bandwidth. If this property is not set, NI-RFSA uses the maximum allowed instantaneous bandwidth.

PXIe-5842—Your maximum allowed instantaneous bandwidth depends on the device's hardware options, configured device personality, and the downconverter center frequency you use. Refer to the NI PXIe-5842 Specifications for more information about instantaneous bandwidth and device personality. Set this property to select different device instantaneous bandwidths for a given downconverter center frequency. The device instantaneous bandwidth that you select is greater than or equal to the requested instantaneous bandwidth. If this property is not set, NI-RFSA uses the maximum allowed instantaneous bandwidth.

Default Value: N/A

Supported Devices: PXI-5600, PXIe-5601/5603/5605/5606 (external digitizer mode), PXIe-5644/5645/5646, PXI-5661, PXIe-5663/5663E/5665/5667/5668, PXIe-5693/5694, PXIe-5820/5830/5831/5832/5840/5841/5842/5860

Related Topics

PXIe-5830 Frequency and Bandwidth Selection

PXIe-5831/5832 Frequency and Bandwidth Selection

PXIe-5841 Frequency and Bandwidth Selection

Remarks

The following table lists the characteristics of this property.

Short Name Device Instantaneous Bandwidth
Data type cdbl.png
Permissions Read/Write
High-level VIs N/A
Channel-based No
Resettable Yes