Contact US

Log In

Come Join Us!

Are you an
Engineering professional?
Join Eng-Tips Forums!
  • Talk With Other Members
  • Be Notified Of Responses
    To Your Posts
  • Keyword Search
  • One-Click Access To Your
    Favorite Forums
  • Automated Signatures
    On Your Posts
  • Best Of All, It's Free!

*Eng-Tips's functionality depends on members receiving e-mail. By joining you are opting in to receive e-mail.

Posting Guidelines

Promoting, selling, recruiting, coursework and thesis posting is forbidden.

Students Click Here

FFT HDL Optimized block output is different from FFT block output

FFT HDL Optimized block output is different from FFT block output

FFT HDL Optimized block output is different from FFT block output

Hi... Everyone, I need to implement a n point fft on a Fpga. So, for the testing purpose I have created a simulation model to test the output of the n point fft and ifft model. The output from the n-point FFT HDL Optimized block is different from FFT block output. Whats going wrong with this simulation? How do I need to modify the model?

Simulink model

Configuration is as follows.

1. Created a sine wave with following parameters.

2. Parameters of FFT HDL Optimized block

3. Parameters of IFFT HDL Optimized block

4. Parameters of FFT block

5. Figure of FFT HDL Optimized block output

6. Figure of IFFT HDL Optimized block output

7. Figure of FFT block output

Above (Figure of FFT block output) is the desired output. But fft/ifft hdl optimized outputs gives a wrong result. Please help me on this problem.

Thank You!

RE: FFT HDL Optimized block output is different from FFT block output

I might be wrong, but it looks to me that you are picking up harmonics in the optimized outputs. Try a longer length such as 256 points.

Red Flag This Post

Please let us know here why this post is inappropriate. Reasons such as off-topic, duplicates, flames, illegal, vulgar, or students posting their homework.

Red Flag Submitted

Thank you for helping keep Eng-Tips Forums free from inappropriate posts.
The Eng-Tips staff will check this out and take appropriate action.

Reply To This Thread

Posting in the Eng-Tips forums is a member-only feature.

Click Here to join Eng-Tips and talk with other members! Already a Member? Login


Low-Volume Rapid Injection Molding With 3D Printed Molds
Learn methods and guidelines for using stereolithography (SLA) 3D printed molds in the injection molding process to lower costs and lead time. Discover how this hybrid manufacturing process enables on-demand mold fabrication to quickly produce small batches of thermoplastic parts. Download Now
Design for Additive Manufacturing (DfAM)
Examine how the principles of DfAM upend many of the long-standing rules around manufacturability - allowing engineers and designers to place a part’s function at the center of their design considerations. Download Now
Taking Control of Engineering Documents
This ebook covers tips for creating and managing workflows, security best practices and protection of intellectual property, Cloud vs. on-premise software solutions, CAD file management, compliance, and more. Download Now

Close Box

Join Eng-Tips® Today!

Join your peers on the Internet's largest technical engineering professional community.
It's easy to join and it's free.

Here's Why Members Love Eng-Tips Forums:

Register now while it's still free!

Already a member? Close this window and log in.

Join Us             Close