NIRFSG_ATTR_LOOP_BANDWIDTH
- Updated2025-10-14
- 1 minute(s) read
Configures the loop bandwidth of the tuning PLLs.
Syntax
NIRFSG_ATTR_LOOP_BANDWIDTH
Numeric Value | Data Type | Access | Applies To |
|---|---|---|---|
1150027 | ViInt32 | Read/Write | Los |
Remarks
This attribute is ignored on the PXI-5610, PXI-5670/5671, and PXIe-5672 for signal bandwidths greater than or equal to 10MHz. This attribute is ignored on the PXI/PXIe-5650/5651/5652 for RF frequencies less than 50MHz.
Setting this attribute to NIRFSG_VAL_WIDE on the PXIe-5644/5645/5646, PXI/PXIe-5650/5651/5652, or the PXIe- 5673/5673E allows the frequency to settle significantly faster at the expense of increased phase noise. Setting this attribute to NIRFSG_VAL_MEDIUM is not a valid option on the PXI/PXIe-5650/5651/5652 or PXIe-5673/5673E. NIRFSG_VAL_MEDIUM is the only supported value for the PXIe-5840/5841/5842.
To use this attribute for the PXIe-5830/5831/5832, you must use the channelName parameter of the niRFSG_SetAttributeViInt32 function to specify the name of the channel you are configuring. You can configure the LO1 and LO2 channels by using lo1 or lo2 as the channel string, or set the channel string to lo1,lo2 to configure both channels. For all other devices, the the only valid value for the channel string is "" (empty string).
Defined Values:
Name | Value | Description |
|---|---|---|
NIRFSG_VAL_MEDIUM | 1 (0x1) | Uses the medium loop bandwidth setting for the PLL. |
NIRFSG_VAL_NARROW | 0 (0x0) | Uses the narrowest loop bandwidth setting for the PLL. |
NIRFSG_VAL_WIDE | 2 (0x2) | Uses the widest loop bandwidth setting for the PLL. |
Default Value:
PXIe-5644/5645/5646, PXIe-5830/5831/5832/5840/5841/5842: NIRFSG_VAL_MEDIUM
PXI/PXIe-5650/5651/5652, PXIe-5673/5673E: NIRFSG_VAL_NARROW
Supported Devices: PXI-5610, PXIe-5644/5645/5646, PXI/PXIe-5650/5651/5652, PXI-5670/5671, PXIe-5672/5673/5673E, PXIe-5830/5831/5832/5840/5841/5842
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