Integrated filter balun
First Claim
Patent Images
1. A circuit comprising:
- a N-stage differential ladder filter having at least two inputs and an output, and a bridge circuit, receiving the output of the N-stage differential ladder filter, having an output a bridge lattice circuit serially coupled to the differential ladder filter, comprising a plurality of resonators serially coupled together in a ring configuration at resonant frequencies alternating between a first and a second resonant frequency;
wherein the N-stage differential ladder filter and the bridge circuit include film bulk acoustic resonators.
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Abstract
In one embodiment, an N-stage ladder circuit is serially connected to a bridge (lattice circuit. The N-stage ladder circuit receives differential inputs, e.g. mixers, while the bridge lattice circuit outputs a singled end output, e.g. amplifier. In another embodiment, a bridge lattice circuit is serially connected to an N-stage ladder circuit. The bridge lattice circuit receives a single ended load while the N-stage ladder circuit provides a differential output. Film bulk acoustic resonators are used in the combination ladder and lattice structure for both embodiments to provide the necessary band-pass functionality as well as make the necessary transition from differential to single ended load.
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Citations
6 Claims
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1. A circuit comprising:
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a N-stage differential ladder filter having at least two inputs and an output, and a bridge circuit, receiving the output of the N-stage differential ladder filter, having an output a bridge lattice circuit serially coupled to the differential ladder filter, comprising a plurality of resonators serially coupled together in a ring configuration at resonant frequencies alternating between a first and a second resonant frequency;
wherein the N-stage differential ladder filter and the bridge circuit include film bulk acoustic resonators. - View Dependent Claims (2, 3, 4)
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5. A filter comprising:
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a differential ladder filter having a plurality of stages and having two inputs and two outputs, each stage including two rail sections and one rung section, each rail section including a resonator at a first resonant frequency, each rung section including a resonator at a second resonant frequency; and
a bridge lattice circuit serially coupled to the differential ladder filter, the bridge lattice circuit comprising a plurality of resonators serially coupled together in a ring configuration at resonant frequencies alternating between the first and the second resonant frequency. - View Dependent Claims (6)
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Specification