PXIe-5842 Specifications
Date: May 08, 2025Views:
PXIe-5842 Configurations
The PXIe-5842 name applies to various instruments, each with diȂerent specifications, that comprise diȂerent sets of individual modules. The PXIe-5842 specifications apply to diȂerent ports across modules within the PXIe-5842 instrument depending on your PXIe-5842 instrument configuration.
PXIe-5842 specifications use shorthand Configuration names to refer to PXIe-5842 instruments. Additionally, depending on the configuration, PXIe-5842 specifications apply at diȂerent ports on diȂerent modules within the overall PXIe-5842 instrument.
The following table describes which configuration name applies to which PXIe-5842 instrument and where the RF Input and RF Output specifications apply within each PXIe-5842 instrument.
Common NI Terminology for RF Settings
Refer to the following list for definitions of common NI terms related to soȅ2areѣ configured settings for the PXIe-5842 and used throughout this document.
Center Frequency ：Refers to the IQ Carrier Frequency property in NI-RFSA, the Frequency property in NI-RFSG, and the Center Frequency property in RFmx.
ƙs t Mode is Automatic：The PXIe-5842 uses a direct conversion architecture. Ȃset Mode allows the instrument to operate in low IF mode, which increases the separation between the signal of interest and the residual sideband image and residual LO leakage power. However, low IF mode limits the available instantaneous bandwidth. A setting of Automatic allows the driver to set Ȃset Mode to Enabled when the signal bandwidth is configured as small enough to allow it. You can read back the Ȃset Mode to determine if the driver selected Enabled or User-Defined.
Automatic is the default value. NI recommends keeping Ȃset Mode set to the default value.
offset Mode is Enabled
Refers to the NI-RFSA Downconverter Frequency Ȃs t Mode property or NI-RFSG Upconverter Frequency Ȃs t Mode property set to Enabled.
Equivalent to Signal Bandwidth ≤ Maximum ƙs t Bandwidth.
The PXIe-5842 uses a direct conversion architecture. Ȃset Mode allows the instrument to operate in low IF mode, which increases the separation between the signal of interest and the residual sideband image and residual LO leakage power
offset Mode is User-Defined
Refers to the NI-RFSA Downconverter Frequency Ȃs t Mode property or NI-RFSG Upconverter Frequency Ȃs t Mode property set to UserDefined.
Equivalent to Signal Bandwidth > Maximum ƙs t Bandwidth.
Onboard:Refers to the value of the LO Source property. A value of Onboard configures the hardware to use the PXIe-5842 LO on an associated PXIe-5655.
Center Frequency Range
Center frequency range
Specification Configuration A
PXIe-5842 VST, 8 GHz, 1 GHz bandwidth:50 MHz to 8 GHz
PXIe-5842 VST, 12 GHz, 2 GHz bandwidth :50 MHz to 12 GHz
PXIe-5842 VST, 23 GHz, 2 GHz bandwidth: 50 MHz to 23 GHz
The PXIe-5842 uses the low frequency subsystem to directly acquire or generate RF signals when Center Frequency ≤ 1.75 GHz. In this frequency range, the bandwidth varies as a function of the requested center frequency according to the following:
*: Maximum Bandwidth = min[1 GHz, 2 × min(Center Frequency - 50 MHz, 2 GHz - Center Frequency)]
500 MHz of bandwidth available for center frequencies between 300 MHz and 1.75 GHz
1 GHz of bandwidth available for center frequencies between 550 MHz and 1.5 GHz
†: Maximum Bandwidth = 2 × min(Center Frequency - 50 MHz, 2 GHz - Center Frequency)
500 MHz of bandwidth available for center frequencies between 300 MHz and 1.75 GHz
1 GHz of bandwidth available for center frequencies between 550 MHz and 1.5 GHz
1.95 GHz of bandwidth available when Center Frequency = 1.025 GHz
When Ȃs t Mode is set to Automatic (the default) and Signal Bandwidth ≤ Maximum ƙs t Bandwidth, the PXIe-5842 oȂsets the bandwidth and operates in a low IF mode. For Center Frequency ≤1.7 GHz, the PXIe-5842 uses the low frequency subsystem to directly acquire or generate the RF signal, and the ability to oȂset is not applicable.
Conditions: Reference level -30 dBm to +25 dBm. This specification excludes the bandwidth between -20 MHz and +20 MHz when both oȂset mode is user-defined and the center frequency is >1.75 GHz. See Common NI Terminology for RF Settings for more information on the oȂset mode.
Magnitude response is defined as the maximum relative amplitude deviation from the amplitude observed at the reference frequency, the frequency where absolute amplitude accuracy is defined. For the absolute amplitude accuracy at the reference frequency, refer to the table in RF Input Amplitude Accuracy. For the , the reference frequency is the center frequency, except when both Signal Bandwidth > Maximum ƙs t Bandwidth and Center Frequency > 1.75 GHz, in which case the reference frequency is 20 MHz oȂset from the configured center frequency.
RF Input Average Noise Density
Conditions: Input terminated with a 50 Ω load; 10 averages; measured 20 MHz oȂset from the center frequency, normalized to 1 Hz bandwidth.
Nominal 3 dB noise density improvement for 0 dBm reference levels when Center Frequency ≥1.75 GHz and Signal Bandwidth ≤ Maximum ƙs t Bandwidth or when oȂset mode is Enabled. Example: between 5.25 GHz to 23 GHz at 0 dBm reference level, the nominal performance is -147 dBm/Hz when Signal Bandwidth ≤ 900 MHz for 2 GHz bandwidth purchase options.
Leveled power defines the maximum requested power level where compression is minimal and the RF Output Amplitude Accuracy specification is valid.
Unleveled power defines the maximum realizable output power of the PXIe-5842 when the requested output power is maximized. Unleveled power is typically compressed from the requested power and its level accuracy is not specified by the RF Output Amplitude Accuracy specification.
Conditions: Measured with a CW signal at the center frequency unless both Signal Bandwidth > Maximum ƙs t Bandwidth and Center Frequency > 1.75 GHz, in which case measured at 20 MHz oȂset from the center frequency.
This table describes PXIe-5842 performance under default conditions. If Signal Bandwidth ≤ Maximum ƙs t Bandwidth when oȂset mode is Automatic, the PXIe-5842 oȂset mode setting automatically changes to Enabled, which provides less output power. Use the User-Defined oȂset mode if you want to maintain the output power shown in this table. See Common NI Terminology for RF Settings for definitions of oȂset mode settings; see Maximum Bandwidth in Equalized Bandwidth for more information about bandwidth.
Leveled power defines the maximum requested power level where compression is minimal and the RF Output Amplitude Accuracy specification is valid.
Unleveled power defines the maximum realizable output power of the PXIe-5842 when the requested output power is maximized. Unleveled power is typically compressed from the requested power and its level accuracy is not specified by the RF Output Amplitude Accuracy specification.
Conditions: Measured with a CW signal at the configured center frequency. Ȃset mode is enabled.
Magnitude response is defined as the maximum relative amplitude deviation from the amplitude observed at the reference frequency, the frequency where absolute amplitude accuracy is defined. For the absolute amplitude accuracy at the reference frequency, refer to the table in RF Output Amplitude Accuracy. For the , the reference frequency is the center frequency, except when both Signal Bandwidth > Maximum ƙs t Bandwidth and Center Frequency > 1.75 GHz, in which case the reference frequency is 20 MHz oȂset from the configured center frequency.
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