Software-Defined Radio Product Survey

Software-defined radio has been around long enough that the term itself no longer sounds particularly revolutionary. What has changed dramatically is what sits behind it. Improvements in RF data converters, FPGAs, RFSoCs, and high-speed digital interfaces have steadily pushed the boundary between the analog and digital portions of the radio toward the antenna, reducing the amount of hardware required to perform functions that once demanded multiple conversion stages.

The traditional SDR architecture remains widely used and for good reason. An RF front end selects and conditions the desired portion of spectrum, mixers translate it to a lower frequency, and ADCs and DACs provide the bridge to an FPGA, DSP, or general-purpose processor. Integrated RF transceivers have condensed much of that chain into a single IC, and devices such as Lime Microsystems’ LMS7002M and many products from Analog Devices have enabled complete radios to shrink to module and even M.2 card dimensions. But that is no longer the only way to build an SDR.

Converter sample rates have increased to the point where direct-RF sampling can eliminate one or more analog frequency-conversion stages. Analog Devices’ AD9084, for example, combines four 20-GSPS, 12-bit ADCs with four 28-GSPS, 16-bit DACs and provides usable analog bandwidth to 18 GHz. Texas Instruments’ AFE8108 integrates eight 6-GSPS receive ADCs and eight 12-GSPS transmit DACs, with RF coverage from 100 MHz to 7.4 GHz and a signal bandwidth of up to 2.4 GHz when operated as a 2T2R device.

The FPGA has been moving in the same direction. AMD’s third-generation Zynq UltraScale+ RFSoC combines RF ADCs and DACs, programmable logic, and Arm processing in one device. The ZU47DR provides eight 14-bit ADCs operating at up to 5 GSPS and eight 14-bit DACs at up to 9.85 GSPS, with RF input frequencies up to 6 GHz. More recently, devices such as the Altera Agilex 9 Direct RF-Series have pushed integrated converter rates to 64 GSPS. The AGRW027 incorporates eight 10-bit ADCs and eight 10-bit DACs, each capable of 64-GSPS operation.

This level of integration is now appearing in deployable COTS hardware rather than simply evaluation platforms. Mercury Systems and Annapolis Micro Systems both offer 3U VPX products based on the Agilex 9 Direct RF architecture, while Abaco Systems packages AMD RFSoC technology in a SOSA-aligned VPX card. Epiq Solutions offers SDR hardware ranging from very small, embedded modules to multichannel VPX products, and Ettus Research has extended its USRP family to 20 GHz with the X420, which provides 1 GHz of instantaneous bandwidth per channel.

The effect is especially significant in EW, SIGINT, radar, and spectrum-monitoring applications. Wider instantaneous bandwidth enables simultaneous observation of more spectrum, while multiple phase-coherent channels support direction-finding, beamforming, and phased-array systems. Moving more of the signal chain into programmable devices also enables changes to channelization, filtering, modulation, demodulation, and other functions without redesigning the RF hardware.

There are limits to how far the concept can be taken. Direct-RF does not eliminate the analog front end. Filters, amplifiers, protection devices, switches, and, often, frequency conversion are still needed, depending on operating frequency, dynamic-range requirements, and the signal environment. Sampling rate should also not be confused with instantaneous bandwidth: a converter operating at tens of gigasamples per second does not automatically provide an SDR with an equivalent usable RF bandwidth.

What has changed is the number of architectural choices available to the designer. At one end are compact integrated RF transceivers optimized for relatively modest bandwidths and low SWaP. At the other are direct-sampling devices capable of digitizing enormous portions of microwave spectrum, backed by FPGAs powerful enough to process the resulting data streams in real time. Between them are RFSoCs, embedded SDR modules, networked instruments and rugged VPX cards.

The products in the following survey reflect that range. They are not intended to be direct substitutes for one another. Rather, they show how broadly the definition of software-defined radio has expanded and how rapidly the analog-to-digital boundary continues to move toward the antenna.

Software-Defined Radio Product Survey

Representative current products spanning direct-RF devices, RFSoCs, modules, VPX cards and complete SDR platforms.

* Where two converter resolutions are shown, ADC resolution is listed first and DAC resolution second. Specifications are based on manufacturer-published information available in September 2026; maximum bandwidth, channel count and sample rate may depend on configuration.