RADIO-FREQUENCY FILTER, MULTIPLEXER, RADIO-FREQUENCY FRONT-END CIRCUIT, AND COMMUNICATION DEVICE
First Claim
1. A radio-frequency filter, comprising:
- a series-arm circuit disposed on a path that connects an input terminal and an output terminal;
a first parallel-arm circuit connected to a ground and a first node on the path, between the input terminal and the series-arm circuit, the first parallel-arm circuit including a first parallel-arm resonator, and a first switch circuit connected in series to the first parallel arm resonator, the first switch circuit including a first switch element that includes one or more transistors; and
a second parallel-arm circuit connected to the ground and a second node on the path, between the series-arm circuit and the output terminal, the second parallel-arm circuit including a second parallel-arm resonator, and a second switch circuit connected in series to the second parallel-arm resonator, the second switch circuit including a second switch element that includes one or more transistors, whereina gate width of each of the one or more transistors included in the first switch element is greater than a gate width of at least one of the one or more transistors included in the second switch element.
1 Assignment
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Accused Products
Abstract
A filter includes: a series-arm circuit; a first parallel-arm circuit connected to a node and a ground; and a second parallel-arm circuit connected to a node and the ground. The first parallel-arm circuit includes a first parallel-arm resonator, and a first switch circuit connected in series to the first parallel-arm resonator. The second parallel-arm circuit includes a second parallel-arm resonator, and a second switch circuit connected in series to the second parallel-arm resonator. The first switch circuit includes a first switch element that includes one or more transistors. The second switch circuit includes a second switch element that includes one or more transistors. A gate width of each of the one or more transistors included in the first switch element is greater than a gate width of at least one of the one or more transistors included in the second switch element.
4 Citations
20 Claims
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1. A radio-frequency filter, comprising:
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a series-arm circuit disposed on a path that connects an input terminal and an output terminal; a first parallel-arm circuit connected to a ground and a first node on the path, between the input terminal and the series-arm circuit, the first parallel-arm circuit including a first parallel-arm resonator, and a first switch circuit connected in series to the first parallel arm resonator, the first switch circuit including a first switch element that includes one or more transistors; and a second parallel-arm circuit connected to the ground and a second node on the path, between the series-arm circuit and the output terminal, the second parallel-arm circuit including a second parallel-arm resonator, and a second switch circuit connected in series to the second parallel-arm resonator, the second switch circuit including a second switch element that includes one or more transistors, wherein a gate width of each of the one or more transistors included in the first switch element is greater than a gate width of at least one of the one or more transistors included in the second switch element. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A multiplexer, comprising:
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a plurality of filters that include a first filter that is a radio-frequency filter, the radio-frequency filter comprising; a series-arm circuit disposed on a path that connects an input terminal and an output terminal; a first parallel-arm circuit connected to a ground and a first node on the path, between the input terminal and the series-arm circuit, the first parallel-arm circuit including a first parallel-arm resonator, and a first switch circuit connected in series to the first parallel arm resonator, the first switch circuit including a first switch element that includes one or more transistors; and a second parallel-arm circuit connected to the ground and a second node on the path, between the series-arm circuit and the output terminal, the second parallel-arm circuit including a second parallel-arm resonator, and a second switch circuit connected in series to the second parallel-arm resonator, the second switch circuit including a second switch element that includes one or more transistors, wherein a gate width of each of the one or more transistors included in the first switch element is greater than a gate width of at least one of the one or more transistors included in the second switch element, wherein input terminals or output terminals of the plurality of filters are directly or indirectly connected to a common terminal. - View Dependent Claims (15, 16)
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17. A radio-frequency front-end circuit, comprising:
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a multiplexer that includes a plurality of filters that include a first filter that is a radio-frequency filter, or the first filter, the first filter comprising a series-arm circuit disposed on a path that connects an input terminal and an output terminal, a first parallel-arm circuit connected to a ground and a first node on the path, between the input terminal and the series-arm circuit, the first parallel-arm circuit including a first parallel-arm resonator, and a first switch circuit connected in series to the first parallel arm resonator, the first switch circuit including a first switch element that includes one or more transistors, and a second parallel-arm circuit connected to the ground and a second node on the path, between the series-arm circuit and the output terminal, the second parallel-arm circuit including a second parallel-arm resonator, and a second switch circuit connected in series to the second parallel-arm resonator, the second switch circuit including a second switch element that includes one or more transistors, wherein a gate width of each of the one or more transistors included in the first switch element is greater than a gate width of at least one of the one or more transistors included in the second switch element, and wherein input terminals or output terminals of the plurality of filters are directly or indirectly connected to a common terminal; and an amplifier circuit directly or indirectly connected to the radio-frequency filter or the multiplexer. - View Dependent Claims (18, 19, 20)
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Specification