[![Sawtooth Wave][1]][1]


  [1]: https://i.sstatic.net/RJpZP.png


Hi all, I've been trying to zero centre a waveform prior to IFFT.   my recent attempts are based on the following code which is producing the waveform below.   I don't understand why this isn't working or why there are notches in the sawtooth wave.   Is my math incorrect?

The following code snippet is used to center it.

    zeroStartRadianValue = 2*PI*f0/fs*NFFT*0.50*-1.0;