Overview

The Ettus USRP X440 is a USRP Software Defined Radio (SDR) Device that helps you integrate hardware and software for prototyping high-performance, multichannel, wideband signal generation and analysis systems. This SDR features 8 TX and 8 RX channels with a direct sampling transceiver architecture. It also features a Xilinx Zynq UltraScale+ RFSoC with programmable FPGA supporting the open source UHD and RFNoC tool flows for integration of external up- and downconversion, filtering, and amplification front ends. With these features, the Ettus USRP X440 has the IF and processing performance for applications such as radar, EW, SATCOM and mmWave development and prototyping. Additionally, the Ettus USRP X440 includes a GPS-disciplined 10 MHz oven-controlled crystal oscillator (OCXO) Reference Clock, which improves frequency accuracy and synchronization.

View full USRP X440 specifications.

Dual Rate
The Ettus USRP X440 supports being operated at two different master clock rates simultaneously. Due to the direct sampling architecture of the USRP X440, TX and RX signals are affected by Nyquist zones and their boundaries. By using different rates for both radios, one can close the Nyquist gap of the other.

Features

RF Features:

• Front End: Balun-coupled MMPX
• IF Range: 30 MHz – 4 GHz*
• Bandwidth: up to 1.6 GHz*/channel, 3.2 GHz total
• Direct Sampling: Flexible up to 4 GSps
• Channel Count: 8 (Tx/Rx or TRX)
• Phase Coherency: Yes (sample-based)
  • Phase Stability (within device): < 1° RMS
  • Phase Stability (device-to-device): < 2° RMS
  • Phase Repeatability (within device): < 3° Peak-to-Peak
• Tx Output Level: < 0 dBm full scale
• Rx Input Level: 10 dBm full scale

* IF-Bandwidth combination limitations apply due to Nyquist zones and gaps

Digital Features:

• Xilinx Zynq UltraScale+ RFSoC ZU28DR-2
  • Built-in quad-core ARM processor
• Streaming Interface: Dual 100 GEth via QSFP28
• Synchronization: 10 MHz / PPS, GPSDO, IF
• Software: Open source (GNU Radio, RFNoC, UHD)
• GPIO for front-end control via UHD API or FPGA
  • 2x 12 lanes via HDMI with SPI protocol support

View full USRP X440 specifications.

Additional Resources

• USRP X440 Knowledge Base Article
• Sampling Rates and Master Clock Rates for the USRP X440 – Application Note
• Building and Installing UHD and GNU Radio Application Note
• Verifying USRP Operation Application Note
• RFNoC Development Application Note
• Getting Started With UHD and C Application Note

Recommended Accessories

• Dual 100 Gigabit Ethernet PCIe Interface Kit (PN 788216-01)
• QSFP28 to 4xSFP28 Breakout Cable (PN 788214-01)
• Octoclock CDA-2990
• HDMI cable (PN 152629-01 or 152629-02)
• HDMI Shielded AUX I/O Connector Block (PN 782444-01)
• 3V Active GPS Antenna