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 on the Xilinx FFT Library. Supplied on CD, this product 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

 Applications

 Models

Parameterisable bit true Matlab models are available to enable exact performance to be simulated. The models enable bit widths to be adjusted to asses optimum dynamic range and other parameters. Contact details can be found on the Contacts page