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General - General purpose FFT core

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  • 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

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Technical data brief

8th May 2007 (136 kB)

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 (foreward) 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.