NI PXIE-5698 PXI Express microwave signal generator

The National Instruments PXIe-5698 is a high-performance microwave signal generator designed for PXI Express systems, delivering exceptional signal purity and wide frequency coverage for advanced RF and microwave test applications. As a key member of NI’s RF vector signal generator family, it combines cutting-edge microwave technology with the modular flexibility of PXIe, making it ideal for aerospace, defense, and wireless communication testing.

The PXIe-5698 integrates seamlessly into automated test environments, leveraging the high-speed PXIe x4 Gen 3 interface for rapid waveform downloads and synchronization with other instruments like spectrum analyzers and vector network analyzers. Its 10 MHz to 26.5 GHz frequency range covers key bands including 5G FR2, satellite communications, and radar systems, while supporting a comprehensive set of modulation formats—from basic AM/FM to complex IQ modulation with 500 MHz bandwidth. With superior phase noise and low spurious emissions, the PXIe-5698 enables accurate testing of high-sensitivity receivers and advanced radar components.

Detailed parameter table

Core advantages and technical highlights

Wide frequency coverage with signal purity

The NI PXIe-5698 spans 10 MHz to 26.5 GHz, addressing the needs of microwave test applications from legacy systems to emerging 5G FR2 (mmWave precursor) standards. Its exceptional phase noise performance (-118 dBc/Hz at 1 GHz, 10 kHz offset) ensures minimal interference when testing sensitive receivers, while spurious emissions ≤-60 dBc prevent false signals from corrupting measurements. This combination of range and purity is critical for radar cross-section testing and satellite transponder validation.

High-speed IQ modulation

With 500 MHz IQ modulation bandwidth, the PXIe-5698 generates complex waveforms such as 5G NR, LTE-A, and custom radar pulses with precise timing. The x4 Gen 3 PXIe interface enables waveform download speeds exceeding 8 GB/s, reducing setup time for long, high-resolution test sequences. This capability is essential for validating 5G base stations and user equipment, where accurate replication of real-world signal conditions is required.

Advanced synchronization

The PXIe-5698 leverages PXIe trigger lines and NI’s 10 MHz reference clock distribution to synchronize with other RF instruments, achieving phase coherence across multiple generators. This is vital for MIMO (multiple-input multiple-output) testing, where precise phase relationships between signals are critical to evaluating antenna array performance. The module also supports external 10 MHz reference input for system-level calibration, ensuring frequency alignment with large test setups.

Flexible modulation capabilities

Beyond standard AM/FM/PM, the PXIe-5698 offers pulse modulation with 10 ns rise/fall times and arbitrary waveform generation for custom signal scenarios. Its IQ modulation supports up to 16-bit resolution, enabling the creation of complex signals with high dynamic range—ideal for testing electronic warfare systems or simulating radar jamming environments. The integrated digital I/O allows for external control of modulation triggers, enhancing integration with external test hardware.

Typical application scenarios

In aerospace and defense, the NI PXIe-5698 is used to test radar systems by generating simulated target signals across 10 MHz to 26.5 GHz. Its low phase noise ensures accurate measurement of radar receiver sensitivity, while pulse modulation capabilities replicate the time-domain characteristics of real-world radar pulses. For electronic warfare testing, it generates jamming signals with complex modulation patterns, enabling evaluation of system resilience to interference.

In 5G FR2 development, the PXIe-5698 generates 28 GHz and 39 GHz 5G NR signals to validate mmWave transceivers. Its 500 MHz IQ bandwidth supports the wide channel bandwidths required for high-data-rate 5G communications, while precise frequency control ensures compliance with 3GPP standards. The module’s ability to synchronize with multiple PXIe-5698 units enables MIMO testing of 5G base stations with 4×4 or 8×8 antenna configurations.

In satellite communication testing, the PXIe-5698 simulates uplink and downlink signals in the Ku, K, and Ka bands (12 GHz to 26.5 GHz). Its exceptional frequency accuracy (±0.005 ppm) ensures alignment with satellite transponders, while low spurious emissions prevent interference with sensitive receiver measurements. This makes it suitable for validating satellite modems and earth station equipment.

Installation, commissioning and maintenance instructions

Installation preparation

Before installing the NI PXIe-5698, ensure the PXIe chassis is powered off and grounded. Use an anti-static wristband to handle the module, avoiding contact with the 2.4 mm RF connector pins. Verify the chassis has an available x4 Gen 3 slot and can supply 150 W of power. Use high-quality 2.4 mm coaxial cables rated for 26.5 GHz to connect the RF output to the device under test (DUT). Mount the module in the chassis, secure with front-panel screws, and connect trigger/SMB cables for synchronization. Install NI-RFmx driver software and run the calibration utility to verify output power and frequency accuracy before first use.

Maintenance suggestions

Inspect the 2.4 mm RF connector quarterly for damage or contamination; clean with compressed air and a lint-free cloth if needed. Avoid over-tightening connectors (torque to 8 in-lbs/0.9 Nm) to prevent thread damage. Calibrate the PXIe-5698 annually using NI’s ISO 17025-accredited service to maintain frequency accuracy and power output specifications—critical for regulated industries like aerospace. Monitor phase noise and spurious emissions via NI’s RFmx software; sudden degradation may indicate a need for service. Store the module in a dry environment (-40 °C to 70 °C) when not in use, and cover the RF connector with a dust cap to prevent contamination.