The Air Force Research Laboratory at Wright-Patterson Air Force Base, Ohio, USA, released the requirements information for the broadband phased array application specific integrated circuit (ASIC) project (RFI-RQKS-2013-0001), seeking to achieve broadband RF digital ASIC with controlled array beamformer function.
The RF digital beamformer has a working frequency of 2-18GHz and supports 8 users to simultaneously receive and send data through 64 channels. It can generate pulse description words (PDW), provide high-speed data interfaces, generate arbitrary waveforms and perform meta-level beams form.
The current implementation is based on commercial off-the-shelf (COTS) data converters and field programmable gate arrays (FPGAs). By using 16X64 radiation elements and passive combination of columns, a digital channelization system is formed. FPGA provides channel-to-channel calibration, phase consistency, and the function of generating pulse descriptors. The digital processing back-end consumes about 800w and is installed in a rack cabinet.
In order to meet the increasing demand for meta-level digital wave velocity formation data, the Air Force hopes to develop customized ASICs to generate large amounts of meta-level and column-level data before splicing it into system-level data. While maintaining phase coherence, the ASIC will provide element-level weighting coefficients according to the needs of each user; provide a high-frequency clock for each node; and provide an aggregation chip for interfacing with end users.
Researchers said that in this project, phased array antennas, phased array system power management, heat dissipation and cooling, passive combination, receivers, transmitters and data converters will not be considered as research content; the main considerations of this project include: : The antenna array pitch is 0.5 inches, the nodes are organized in a master-slave configuration, high-speed low-voltage differential signals exceeding 10 Gigabits per second, every 8 users can track and receive 6 signals of interest, channel-to-channel gain and Phase co-calibration capability.
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