Conflict-free FFT circuit using loop architecture by 5-bank memory system

We developed " Loop architecture " which can perform different length FFT without changing fundamental circuit composition. In order to perform FFT effectively, we adopted Mixed-radix FFT algorithm with radix-2 and radix-4 butterfly calculation. Furthermore, we developed " Pipelined butterfly calculation system" and "5-bank memory architecture" in order to perform Mixed-radix FFT effectively. As a result, we succeeded to develop the versatile FFT processing system with small circuit area and low latency. In addition, we implemented our circuit to Spartan-6 FPGA board and developed sound analysis system via USB.