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TMS320F28069M: SFRA plant bandwidth calculation

s91240719
Intellectual 340 points

Part Number: TMS320F28069M
Other Parts Discussed in Thread: SFRA

Hi

I am using SFRA to measure plant

In the plot ,the bandwidth is around 3000~4300Hz (at - 3db)by analyzing Magnitude V.S. Frequency .

However the UI is showing bandwidth 1610Hz .

I always get difference result. which result should I trust?

Andrew

  • 0
    TI__Mastermind 43730 points
    The bandwidth measured is shown for open loop gain not plant.

    The bandwidth measurement is a very simple algorithm, and can error out. I will trust the plot and what you see visually. Not what is reported below. It is accurate for open loop gain plot, hence in the new version of the GUI we have renamed this to be Open Loop Gain Cross Over Frequency.

    See figure 18 and 19

    www.ti.com/.../spruik4.pdf