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Software Radio Module Provides FPGA Preconfigured for Turnkey Operation

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A new multichannel data converter with digital down and upconverters boasts two channels each of 12-bit, 500 MHz A/D and 16-bit, 800 MHz D/A. The Model 71651 from Pentek has a Xilinx Virtex-6 FPGA at its core. The FPGA is preconfigured with data acquisition and playback IP to give the module turn-key functionality, with room left for user customization. The Model 71651 features two input and two output RF channels, transformer-coupled to allow direct connection to HF or IF radio stages. The input channels feature 12-bit, 500 MHz A/Ds that feed data into the Virtex-6 FPGA. The output channels incorporate a Texas Instruments DAC5688 digital upconverter that translates real or complex baseband signals to any IF frequency up to 380 MHz. Dual 16-bit, 800 MHz D/As create real or in-phase (I) and quadrature (Q) analog outputs.

Four types of preconfigured IP in the FPGA help simplify the capture, movement and playback of data. Three Acquisition IP modules accept data from any of the A/Ds, a test signal generator, or the Playback IP in loopback mode. These acquisition modules each have a private memory bank for storing data in capture mode, or to serve as a FIFO buffer for the linked-list DMA engine to move data off-board through the x8 Gen 2 PCIe interface. The DMA engines can automatically generate meta-data to simplify host processing.

The D/A Waveform Playback Module provides a linked-list controller so users can easily deliver waveforms stored in onboard or host memory to the D/As. Up to 64 individual link entries can be chained together to create complex waveforms with a minimum of programming. Parameters for each waveform include length of waveform, delay from playback trigger, waveform repetition, plus the link to the next waveform.

Pentek, Upper Saddle River, NJ. (201) 818-5900. [].