REVIEW PAPER ON EFFICIENT VLSI AND FAST FOURIER TRANSFORM ARCHITECTURES

A fast Fourier transform (FFT) is any fast algorithm for computing the DFT. The development of FFT algorithms had a tremendous impact on computational aspects of signal processing and applied science. The decimation - in - time (DIT) fast Fourier transform (FF T) very often has advantage over the decimation - in - frequency (DIF) FFT for most real - valued applications, like speech/image/video processing, biomedical signal processing, and time - series analysis, etc., since it does not require any output reordering. Fas t Fourier Transform (FFT) has the major role in obtaining the signal characteristics with minimum use of resources. Some of the algorithms have been proposed on FFT, such kind of algorithms were less effective in the performance parameters. In this paper, a variety of available FFT algorithms are presented and then different architectures are outlined by exploring the techniques and algorithms involved in each of the architectures. The widely adopted architectures and trends in architectural modification to reduce power consumption and area and to achieve high throughput are discussed.