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(v1.00) April 27, 2004

Mixed Radix DFT ( Matrix ) - 35189 rf engines

Matrix range of DFT/FFT cores 2-point 'Dual-speed' DFT Product Specification

OVERVIEW

This document describes the RFEL 2-point 'Dual-Speed’ DFT core, which belongs to RFEL's Matrix range. The core processes complex input data in continuous real time, with no gaps in the data, at complex data rates of up to 200 MS/s. For many applications the radix-2 FFT [1][2] provides an adequate solution; however, there are some applications where a non-power-of-two number of FFT points is required - for instance to provide a particular frequency bin spacing at the output which is not a power-of-two division of the input frequency span. This core may be combined with RFEL's other Matrix DFT cores for problems that require such a mixed-radix solution (see for example [3]). The core is intended for use in applications where processing speed is critical and optimum use of available silicon is required. The core is available for licence in netlist form as a component ready to be combined with customer’s own IP. Alternatively RFEL can provide the 2-point DFT as part of a larger mixed-radix core in either netlist or bitstream format.

FEATURES

? Continuous real time processing of complex data at up to 200MS/s ? Compatible with 400MS/s ADC using RFEL’s optional DHBF core ? Fully pipelined design ? Targeted at Xilinx and Altera FPGA families ? Bit-widths and bit-growths adjustable at factory ? Fully bit-true parameterisable models are available ? Other DFT sizes available

APPLICATIONS

? Wide-band filter banks. ? Communications systems with exact required bin spacing. ? Electronic warfare (radar, sonar, surveillance) ? Medical instrumentation ? Test instrumentation ? Real-time spectral analysis This core is most likely to be useful as part of an FFT where an exact bin spacing/sample rate combination is required at the FFT output. © rf engines limited all rights reserved http://www.rfel.com Tel: +44(0)1983 550330