Filter device
First Claim
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1. A filter device, comprising:
- a first filter unit including at least one series resonator and at least one shunt resonator in a ladder configuration; and
a second filter unit connected to said first filter unit by a resonator selected from a group consisting of said at least one series resonator of said first filter unit;
said first filter unit including an unbalanced terminal;
said second filter unit including at least four resonators in a lattice configuration; and
said second filter unit including two balanced terminals.
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Abstract
The present invention provides a filter device constructed of a combined ladder and lattice filter topology. The filter device synergistically combines the good features of both types of filters. Using the filter device, an integrated unbalanced-to-balanced filter device can be realized. Accordingly, a substantial decrease in the number of components can be achieved. Furthermore, the filter device can be integrated with further components, preferably active RF-components, on a single chip.
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Citations
12 Claims
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1. A filter device, comprising:
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a first filter unit including at least one series resonator and at least one shunt resonator in a ladder configuration; and
a second filter unit connected to said first filter unit by a resonator selected from a group consisting of said at least one series resonator of said first filter unit;
said first filter unit including an unbalanced terminal;
said second filter unit including at least four resonators in a lattice configuration; and
said second filter unit including two balanced terminals. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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Specification