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TMS320F28377S: SFRA

user5624527
Intellectual 800 points
Part Number: TMS320F28377S
Other Parts Discussed in Thread: SFRA

In the BUCK example project of F28377S (C:\ti\controlSUITE\development_kits\BOOSTXL_BUCKCONV\v1_01_00_00\Buck_VMC_F2837xS)

//SFRA step Multiply = 10^(1/No of steps per decade(35))
#define SFREQ_STEP_MULTIPLY (float)1.0680004
What is "No of steps per decade"?
Why it is 35?
Best Regards,
  • 0 in reply to Manish Bhardwaj
    Intellectual 800 points
    In fact, The meaning of "decade" is confusing me. Is it mean "ten years" or "Tenfold"? Or other meanings?
    And what means "no of steps per decade"? Do you have any instruction documents that can explain it detailed?
  • 0 in reply to user5624527
    Expert 1270 points

    hello 坑坑!

     About SFRA step Multiply = 10^(1/No of steps per decade(35))：

    It comes from log 10, basically, we want 35 steps in a decade i.e. as frequency goes from 1 to 10, or 10 to 100, With some math's if we create a frequency vector that multiplied the frequency point where FRA is performed by 10 ^(1/ no of steps), you will get no of steps in a decade of frequency.

    This is done because bode is plotted on Log10 scale.

    I'm also looking at this routine now.Can i communicate with you? QQ:1599165211.Thank you!