engleski

Inductorless Elliptic Filters with Reduced Number of Capacitors Using Signal-Flow Graphs

In this paper a method of realizing elliptic filters using signal-flow graphs is presented. Elliptic filters having a minimum number of capacitors are compared with those having a higher number of capacitors. This number is particularly significant when comparing filters realized in balanced-to-ground and unbalanced form. The version with a canonic number of capacitors provides area savings in IC form, whereas both (filters with a minimum [i.e. canonic] number of capacitors and those having a higher number of capacitors) have a low sensitivity to component tolerances. The sfg derivations necessary to realize higher-order elliptic filters with a reduced number of capacitors is presented. Transfer function magnitudes are simulated using the PSpice program. Monte Carlo runs confirm the low sensitivity to component tolerances of both circuit types.

Elliptic filters; IC design; signal-flow graphs; small chip area; low sensitivity to component tolerances

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