Table Of Contents

Configure IQ Rate (G Dataflow)

Version:
    Last Modified: December 19, 2018

    Specifies the I/Q rate, in samples per second (S/s), for the acquisition.

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    Note

    For the PXIe-5663E/5665/5667/5668, NI-RFSA enables dithering by default. The dither noise can appear in your passband and affect your measurements.

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    session in

    Instrument session obtained from Initialize With Options .

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    error in

    Error conditions that occur before this node runs.

    The node responds to this input according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Default: No error

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    IQ rate

    I/Q rate, expressed in samples per second (S/s), for the acquisition.

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    session out

    Reference to your instrument session passed to the next node.

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    error out

    Error information.

    The node produces this output according to standard error behavior.

    Standard Error Behavior

    Many nodes provide an error in input and an error out output so that the node can respond to and communicate errors that occur while code is running. The value of error in specifies whether an error occurred before the node runs. Most nodes respond to values of error in in a standard, predictable way.

    error in does not contain an error error in contains an error
    If no error occurred before the node runs, the node begins execution normally.

    If no error occurs while the node runs, it returns no error. If an error does occur while the node runs, it returns that error information as error out.

    If an error occurred before the node runs, the node does not execute. Instead, it returns the error in value as error out.

    Digitizer Bandwidth Behavior

    For the PXIe-5663E/5665/5667/5668, when you set the Digitizer Sample Clock Timebase Source property to OnboardClock, the digitizer bandwidth is greater than or equal to the coerced IQ rate times 0.8.

    Device-Specific Signal Bandwidth Limitations

    Actual signal bandwidth is limited for all supported devices by the anti-aliasing filter. Further device-specific limitations are as follows.

    • PXIe-5663E, PXIe-5644/5645/5646, PXIe-5840: Maximum allowed instantaneous bandwidth depends on the downconverter center frequency you use.
    • PXIe-5665: Actual signal bandwidth is limited by the preselector and the combination of the chosen IF filter and anti-aliasing filter. Maximum allowed instantaneous bandwidth is independent of the downconverter center frequency for frequencies less than 3.6 GHz. At frequencies greater than 3.6 GHz, if your device supports the preselector (YIG-tuned filter) and you have enabled it for your application, the maximum allowed instantaneous bandwidth is limited to the instantaneous bandwidth of the preselector.
    • PXIe-5667: Actual signal bandwidth is limited by the preselector and the combination of the chosen IF filter and anti-aliasing filter. Maximum allowed instantaneous bandwidth depends on the downconverter center frequency you use.
    • PXIe-5668: Actual signal bandwidth is limited by the FPGA image that is downloaded upon opening the session to the PXIe-5624 IF digitizer. Maximum allowed instantaneous bandwidth depends on the downconverter center frequency you use.
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    Note

    Refer to the specifications for your device for more information about instantaneous bandwidth limits.

    Search within the programming environment to access the following installed examples:
    • RFSA Getting Started IQ
    • RFSA Getting Started Multi Record IQ
    • RFSA Acquire Continuous IQ

    Where This Node Can Run:

    Desktop OS: Windows

    FPGA: Not supported

    Web Server: Not supported in VIs that run in a web application

    Hardware Support:

    This node supports the following hardware:

    • PXIe-5644/5645/5646
    • PXIe-5663E/5665/5667/5668
    • PXIe-5820/5840


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