The cut-off frequency, corner frequency or -3dB point of a high pass filter can be found using the standard formula of: ƒc = 1/(2πRC) . The phase angle of the resulting output signal at ƒc is +45o.
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Calculate cutoff frequency of low pass filter The cutoff frequency denotes the frequency at which the two values are equal, ie R = X_C . Thus, at a frequency above the cutoff frequency, X_C is less than R, at a lower frequency, X_C is greater than R.
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