A design procedure for 2-channel mixed analog and digital filter banks for A/D conversion using minimax optimization

In this paper a design procedure for 2-channel hybrid filter banks for use in high-speed A/D converters is proposed. By using minimax optimization, A/D converting systems consisting of an analog analysis filter bank and a digital synthesis filter bank are designed with the aid of bireciprocal lattice wave digital filters. Using hybrid filter banks the requirements on the A/D converters used in each channel are reduced. The performance of the resulting system when simultaneously introducing gain and phase errors due to mismatches between the A/D converters and sample time uncertainty in the sample-and-hold circuits, respectively, is analysed by means of the expected attenuation of the resulting aliasing components.