vhdl coding for fft application

[revathivenkat]

Hi,i am in need of vhdl code to perfom multiplication of complex numbers for fft in vhdl.....help me in this regard...

 

[TrickyDicky]

what have you done so far?

 

[revathivenkat]

i know to do multiplication of ordinary numbers in vhdl.....but no knowledge about how to represent or do operations in complex numbers(real,imaginary parts)...

 

[TrickyDicky]

you can store them however you want. They are two different numbers at the end of the day.

 

[std_match]

VHDL has no predefined (synthesizable) complex data types. You have to define the representation (rectangular or polar) and the operations.
You do a complex rectangular multiplication like this:

(a+jb) * (c+jd) = ac-bd + j(ad+bc)