The USRP X440 from Ettus Research is a Software Defined Radio (SDR) that operates from 30 MHz to 4 GHz. It has independently tunable 8 Tx and 8 Rx channels with up to 1.6 GHz bandwidth per channel and an aggregated bandwidth of up to 3.2 GHz. This radio utilizes a direct sampling architecture and features a Xilinx Zynq Ultrascale+ RFSoC with programmable FPGA supporting the open-source UHD and RFNoC tool flows for integration of external up- and down-conversion, filtering, and amplification front ends. It includes a GPS-disciplined 10 MHz oven-controlled crystal oscillator (OCXO) reference clock, which improves frequency accuracy and synchronization. This SDR is suitable for use in radar, EW, SATCOM and mmWave development and prototyping applications.
The USRP X440 has balun-coupled access to the ADCs and DACs onboard Xilinx Zynq UltraScale+ RFSoC. It can utilize all eight transmit and receive channels of the RFSoC, contributing to the high channel density achieved on the USRP platform. This radio contains no local oscillators (LOs), enabling relatively easy synchronization achieved by aligning clocks across channels with a phase stability of better than 1° (RMS) across channels in the same device. It has a maximum sampling rate of 2 GSps per channel, which equates to 8 GB/s or 64 Gbit/s bidirectional per stream and uses two QSFP ports to transfer data over a dual 100 GbE interface. The SDR requires a DC supply of 12 V and consumes less than 16 A of current. It is available in an enclosure that measures 28.5 x 22.2 x 4.4 cm and includes USB-C and HDMI interfaces.
