Notch filters using simulink

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Meena Farag
Meena Farag 2019-4-24
I am trying to produce the bode plot of an IIR Notch filter on simulink using the numerator and denominator coefficients of the TF. The only block it looks like I can use for this is the Biquad filter block (Direct form 1) however, the result in the bode plot (using the BODE PLOT block) is showing the wrong frequency being filtered. I have confirmed through hardware that it should be filtering a specific frequency, but by entering the coefficients in the Biquad filter block, it's filtering a much lower frequency.
Am I just using the wrong block?

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