passband ripple

As can be seen from this response, the passband ripple (zoomed in) comfortably meets the requirements, with 0.375mdB to spare.

Note that this passband ripple is different from that of a substrate etalon ripple.

J sets the passband ripple height and the stopband loss and these two design requirements can be interchanged.

These are most useful where the design requirement is not too stringent, that is, moderate bandwidth, roll-off and passband ripple.

Comparing the bandwidths of networks with passband ripple to those with a maximally flat response, an increase of approximately 50% is achieved.

A common response function used by filter designers is the Chebyshev filter which trades steepness of the transition band for passband ripple.

Elliptic filters are generally specified by requiring a particular value for the passband ripple, stopband ripple and the sharpness of the cutoff.

After clicking "OK" button, you will see the list of filter coefficients, parameters of the designed filter, ie. achieved stopband attenuation, passband ripples and transition band.

The value of the ripple factor specifies the passband ripple, while the combination of the ripple factor and the selectivity factor specify the stopband ripple.

For example for the lowpass filter design the coefficients have to be designed to decreasing the passband ripples and increase the stopband attenuation by the amplitude of the estimated quantization noise.

Chebyshev filters are analog or digital filters having a steeper roll-off and more passband ripple (type I) or stopband ripple (type II) than Butterworth filters.

Because of the passband ripple inherent in Chebyshev filters, the ones that have a smoother response in the passband but a more irregular response in the stopband are preferred for some applications.

Note that the 0.1 dB passband ripple specification for the SR640 series filters is a measured specification, not just the theoretical passband ripple of the transfer function.

The resulting transmission function of the network has a passband ripple like the Chebyshev filter, but the ripples never reach 0dB insertion loss at any point in the passband, as they would do for the standard filter.

Because the coefficients of digital filters are definite, they can be used to achieve much more complex and selective designs - specifically with digital filters, one can achieve a lower passband ripple, faster transition, and higher stopband attenuation than is practical with analog filters.

The total of baseband magnitude response passband ripples, assuming that no distortion is introduced by the modulator, is the sum of all lowpass filter passband ripples of all the stages and the noise spectrum aliased into the signal band.