Switchable acoustic wave filter
AssigneeSkyworks Solutions, Inc.
InventorsWeimin Sun, Hai H. Ta, David Richard Pehlke
Life of this patent
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Abstract
Aspects of this disclosure relate to a switchable acoustic wave filter. The switchable acoustic wave filter can include a switch configured to electrically connect an acoustic wave resonator to a node in a first state and to electrically isolate the acoustic wave resonator from the node in a second state. The switchable acoustic wave filter can filter a radio frequency signal with at least the acoustic wave resonator and a second acoustic wave resonator in the first state. The switchable acoustic wave filter can filter the radio frequency signal with at least the second acoustic wave resonator in the first state. Related multiplexers, radio frequency systems, wireless communication devices, and methods are also disclosed.
Claims20
A switchable acoustic wave filter comprising:
- a first acoustic wave resonator;
- a second acoustic wave resonator;
- and
- a switch configured to electrically connect the first acoustic wave resonator to a node of the switchable acoustic wave filter in a first state and to electrically isolate the first acoustic wave resonator from the node of the switchable acoustic wave filter in a second state, the switch configured to electrically connect an electrode of the first acoustic wave resonator to a passive impedance element in the second state such that the passive impedance element is in parallel with the first acoustic wave resonator in the second state;
- the switchable acoustic wave filter configured to receive a radio frequency signal, filter the radio frequency signal with at least the first acoustic wave resonator and the second acoustic wave resonator in the first state, and filter the radio frequency signal with at least the second acoustic wave resonator in the second state.
A multiplexer comprising:
- a switchable acoustic wave filter including a first acoustic wave resonator, a second acoustic wave resonator, and a switch configured to electrically connect the first acoustic wave resonator to a node of the switchable acoustic wave filter in a first state and to electrically isolate the first acoustic wave resonator from the node of the switchable acoustic wave filter in a second state for co-existence;
- the switchable acoustic wave filter configured to receive a radio frequency signal, filter the radio frequency signal with at least the first acoustic wave resonator and the second acoustic wave resonator in the first state, and filter the radio frequency signal with at least the second acoustic wave resonator in the second state for co-existence;
- the switchable acoustic wave filter being a band pass filter having a pass band;
- and;
- and
- a second filter coupled to the switchable acoustic wave filter at a common node, the second filter being a band stop filter having a stop band, and an edge of the pass band of the switchable acoustic wave filter being farther from an edge of the stop band of the second filter in the second state for co-existence than in the first state.
A method of radio frequency filtering, the method comprising:
- filtering a radio frequency signal with at least a first acoustic wave resonator and a second acoustic wave resonator of a switchable acoustic wave filter in a first state, the switchable acoustic wave filter being a band pass filter having a pass band;
- a toggling a state of the switchable acoustic wave filter from the first state to a second state;
- and
- filtering a radio frequency signal with at least the second acoustic wave resonator of the switchable acoustic wave filter and not with the first acoustic wave resonator in the second state, the pass band of the band pass filter having an edge that is farther from an edge of a stop band of a band stop filter in the second state than in the first state, the band pass filter and the band stop filter being included in a multiplexer and being connected to each other at a common node.
Dependencies are inferred from the claim text.