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General
 
 

General purpose FFT core

Product code: CMS0001

 
The FFT Core implements a FFT and inverse FFT suitable for use in Modulators or Demodulators for OFDM (COFDM) systems such as DVB-T/H, 802.11a and 802.16a.
It uses a fast and efficient radix-4 engine to compute the FFT. All logic is fully pipelined to clock at 4x - 7x sample rate, depending on FFT size.

Block diagram

General purpose FFT core block diagram (click to enlarge) Radix-4 FFT Engine block diagram (click to enlarge)
Click on diagram to enlarge

Downloads

General purpose FFT core Technical data brief, 14th October 2011 (372 kB)Technical data brief, 14th October 2011 (372 kB)
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Features

  • Synthesis control for any FFT size = 2n.
  • Synthesis control supports multiple sizes with run-time size selection.
  • Synthesis control of signal precision (variable width).
  • Performs forward and inverse FFT.
  • In FFT (forward) mode, inputs are gathered in time-order at sample rate. Outputs are produced in a burst at clock rate (4x - 7x sample rate).
  • In IFFT (inverse) mode, inputs are gathered in frequency-order at clock rate. Outputs are produced at sample rate.
  • Outputs are produced in sorted or scrambled order.