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In the low-cost off-the-shelf range of FFT cores there are two options:
the HiSpeed, for up to 100Msps complex inputs, and the QuadSpeed
for up to 400Msps complex inputs. These cores are intended for use
in applications where processing speed is critical and optimum use
of available silicon is required.
The
FFT cores are radix-2, fully pipelined, complex FFTs and are highly
optimised in terms of their memory, multiplier and logic use. Use
of the optional Interleavers / De-interleavers enables several channels
to be multiplexed through the same core.
The cores are supplied in netlist or bit stream form for Xilinx
and Altera FPGAs, and include bit-true Matlab models, and VHDL testbenches.
Our automated design methodology enables us to tailor the core parameters
to exactly match the application requirements. Parameters such as
input bit width, twiddle bit width, bit growth and output bit width
are fully adjustable by RFEL. Furthermore the bit-reverser and input
buffer can be exluded from the design, providing a more compact
core where these features are not required. Using this methodology
it is quick and cost effective for RFEL to create FFT cores that
precisely match the systems requirements.
Alternatively,
a selection of HiSpeed and QuadSpeed FFT cores targetted at the
most common FFT requirements are available in the Xilinx
FFT Library. Supplied on CD, this includes a range of FFT cores
for different transform lengths, sample rates, and device types.
More detailed information is contained in the datasheets, which
are available for download.
Features
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Proven
in Xilinx and Altera. |
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Continuous real time processing up to 100Msps complex "off
the shelf" (400Msps Quadspeed) |
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8 to 128k points available in single chip solutions, 4 Million
points with external to FPGA memory. |
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Optimised for the speed silicon trade off. |
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Twiddle
bit and bit growth adjustable ( factory setting ). |
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Fully
Pipelined design. |
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Applications
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Wide
band filter banks. |
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Communications
systems. |
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Electronic
warfare (radar, sonar, surveillance). |
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Medical
Instruments. |
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Spectrum
analysis. |
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Multi-channel
- many low speed channels can be interleaved through the single
high speed core. |
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OFDM
systems. |
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