COBRA: a 100-MOPS single-chip programmable and expandable FFT

Abstract

This paper presents an optimized column fast Fourier transform (FFT) architecture, which utilizes bit-serial arithmetic and dynamic reconfiguration to achieve a complete overlap between computation and communication. As a result, for a clock rate of 40 MHz, the system can compute a 24-b precision 1K point complex FFT transform in 9.2 /spl mu/s, far surpassing the performance of any existing FFT systems.