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AssigneeAlcatel
InventorsFrancois Jeanjean, Geert Arthur Edith Van Wonterghem
Estimating the term…
A passive filter arrangement and a method of providing such a filter is described. The frequency response of the filter arrangement is substantially the same as the frequency response of a first filter of an order having a first value, the frequency response of the first filter being representable by a first set of one or more poles and/or one or more zeros. Descriptions of a plurality of second filters are generated, each second filter having an order lower than the order of the first value, each second filter having a frequency response representable by a one or more poles and/or one or more zeros, the one or more poles and/or one or more zeros of each lower order filter being a subset of the first set. The lower order filters are cascaded.
A method of providing a passive filter arrangement whose frequency response is substantially the same as the frequency response of a first filter of an order having a first value, the frequency response of the first filter being representable by a first set of one or more poles and/or one or more zeros, the method comprising the steps of:
A method according to any previous claim wherein the first filter is a lowpass filter, bandpass filter, band-reject filter, highpass filter or a notch filter.
A passive filter arrangement whose frequency response is substantially the same as a filter of the type whose transfer function is definable as a reference analytic expression, e.g. a Chebyshev, Inverse Chebyshev, Butterworth, Elliptic, Bessel, Optimal, Parabolic, or similar filter whose Chebyshev, Inverse Chebyshev, Butterworth, Elliptic, Bessel, Optimal, Parabolic, or similar whose frequency response is representable by a first set of one or more poles and/or one or more zeros, the passive filter arrangement comprising a cascade of second filters, each second filter having an order of value lower than the first value, the frequency, each second filter having a frequency response representable by a one or more poles and/or one or more zeros, the one or more poles and/or one or more zeros of each lower order filter being a subset of the first set.
Dependencies are inferred from the claim text.