Here, the power analysys for different point ffts is done, analysed and the results are also placed. these results are tested in the tool. though it may not cover the entire concept it covers the necessary things required. happy reading

1. “POWER ANALYSIS FOR FFT
ARCHITECHTURE”
By;
SIDDHARTHA V
M.Tech in VLSI DESIGN AND EMBEDDED SYSTEMS
1NMIT

2. OVERVIEW
INTRODUCTION
VARIENTS
ARCHITECHTURE
REQUIREMENTS
SIMULATIONS AND RESULTS

3. Fourier Transform
They convert a function from one domain to
another with no loss of information
Reduces the number of calculations in a DFT from N2 to NLogN
 First published by Cooley and Tukey in 1965.
converts a function from the time domain to
the frequency domain.
INTRODUCTION

6. Time Domain and Frequency Domain
Tells us how properties (air pressure in a sound function, for
example) change over time:
Frequency domain:
Tells us how properties (amplitudes) change over
frequencies:
Time Domain

7. Two variants:
Decimation-in-time (DIT) FFT:
 “Divide and conquer” approach to DFT, based on grouping even and odd
inputs in DFT definition
Butterfly: multiply twiddle factor before add/subtract
Decimation-in-frequency (DIF) FFT:
“Divide and conquer” approach based on grouping even and odd outputs
Butterfly: multiply twiddle factor after add/subtract

8. Decimation-in-frequency (DIF) FFT:
Decimation-in-time (DIT) FFT:

9. ARCHITECHTURE
ITIRATIVE ARCHITECHTURE:
One single stage is used for LogN times.
Hardware Efficient
Time taken = (N*LogN) clock cyles.
PIPELINE PARALLEL ARCHITECHTURE:
LogN times different stages are used.
Requires more Hardware.
Time taken = N clock cycles.

10. REQUIREMENTS
Software:
XILINX VIVADO TOOL
For FFT coding.
MATLAB TOOL
For verification.
Hardware:
Artix 7,FPGA Board

11. SIMULATION RESULTS
2-POINT FFT

12. 4 POINT

13. 8 POINT

14. CONCLUSION:
pipelined parallel FFT architecture has been used
which has a lesser power consumption compared to
serial FFT architectures. It also has the advantage of
complete hardware utilization. For verifying and FFT
algorithms written in verilog. Various programming
approaches were understood.