The harmonic distortion at the output caused by gain- and phase mismatch errors between the channels is attenuated by the filters. If calibration is to be performed, only frequencies in the transition regions of the filter banks need to be considered. Generation of skewed clock phases is not needed. The settling time of the sampling circuits can be M times longer, where M is the number of channels Most channels work with a reduced bandwith signal. Filter bank synthesis New design procedures are being developed.
Effort is put on minimizing the complexity of the analog parts.
Excisting technologies is being evaluated and cooptimized with chosen realizations. Research status Several design procedures for the two-channel case has been developed and new classes of filter banks has been introduced. These filter bank classes have a minimized complexity of the analog part, which is important for implementations ,while minimizing the distortion and maximizing the attenuation of aliasing at the output. Both linear and non-linear phase responses is achieved. The design procedures and classes of filter banks have been extended to M channels for the time-discrete case, yielding extremely low complexity analysis filters and a very low overall complexity.