Frequency Response Tab - Frequency Response Tab - 4.0 English - PG140

The Freq. Response tab displays the filter frequency response (magnitude only).

Although the values in the Vivado IDE plot range from 0 to 1.0, they represent the range from 0 to 1/2 the sampling frequency. The normalizing sampling frequency implied in the plot depends on the type of filter. For a CIC decimator, the normalizing sampling frequency is the higher input sampling frequency. For a CIC interpolator, the normalizing frequency is the higher output sampling frequency.

Response Magnitude

Specifies the magnitude scaling of the frequency response: Normalized; Full Precision (the absolute filter gain) and Output Quantization (the effective filter gain given the core output width). In previous versions of the core, the frequency response was always normalized. All plots shown in General Design Guidelines use normalized magnitude.

Passband Range

Two fields are available to specify the passband range, the left-most being the minimum value and the right-most the maximum value. The values are specified in the same units as on the graph x-axis (for example, normalized to pi radians per second). For the specified range, the passband maximum, minimum and ripple values are calculated and displayed (in dB).

Stopband Range

Two fields are available to specify the stopband range, the left-most being the minimum value and the right-most the maximum value. The values are specified in the same units as on the graph x-axis (for example, normalized to pi radians per second). For the specified range, the stopband maximum value is calculated and displayed (in dB).