Digital bilinear LDI ladder filters using lattice equivalents and wave concepts

Lossless discrete integrator (LDI)-based digital filters which implement bilinear transformed third- and sixth-order elliptic transfer functions are presented. The filters are designed by converting ladder prototypes to lattice prototypes, and realizing the resulting lattice impedance reflectances with LDI elements. The structures which result are amenable to compact biserial implementation and require only as many multiplication operations as the filter order. It is concluded that the lattice bilinear LDI formulation may be applicable to the design of parasitic insensitive switched-capacitor filters.<
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