Hi,
In theory BMI270 gyro 3dB cutoff frequency is 751Hz at 3200Hz ODR normal mode and 375Hz at OSR2 mode, 187.5Hz at OSR4 mode. But in reality the results from your experiments are close enough due to the internal signal path and signal conditioning. Sorry that I cannot give you the exact 3dB cutoff frequency numbers at OSR2 and OSR4 mode because this information requires the NDA.
Thanks.
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