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US 2025/0167766 A1Published application
Multiplexer with acoustic assisted trap circuit
AssigneeSkyworks Solutions, Inc.
InventorsLi Chen, Xianyi Li, Zhi Shen, Renfeng Jin
Life of this patent
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Abstract
Aspects of this disclosure relate to a multiplexer with an acoustic assisted trap circuit. The multiplexer includes an acoustic wave filter with an acoustic wave resonator and an impedance network that together provide a trap for a harmonic associated with another acoustic wave filter of the multiplexer. The acoustic wave filter can have an edge of a passband that is farther from the harmonic than other acoustic filters of the multiplexer.
Claims20
A multiplexer comprising:
- a transmit filter including a first acoustic wave resonator;
- and
- a receive filter coupled to the transmit filter at a common node, the receive filter being associated with a different frequency band than the transmit filter, the receive filter including a second acoustic wave resonator and an impedance network, the second acoustic wave resonator and the impedance network being included in a trap circuit, and the trap circuit configured to provide a short circuit to ground at a frequency of a harmonic associated with the transmit filter.
A radio frequency system comprising:
- a power amplifier;
- an antenna switch;
- and
- a multiplexer including a first acoustic wave filter and a second acoustic wave filter, the first acoustic wave filter being in a signal path between the power amplifier and the antenna switch, the second acoustic wave filter including an acoustic wave resonator and an impedance network included in a trap circuit, the trap circuit configured to provide a short circuit at a frequency of a second harmonic associated with the first acoustic wave filter, and the radio frequency system having emissions of less than-90 dBc for the second harmonic associated with the first acoustic wave filter.
1 more element
A method of radio frequency filtering, the method comprising:
- filtering a radio frequency signal with a first acoustic wave filter of a multiplexer, the multiplexer also including a second acoustic wave filter, the first acoustic wave filter being a transmit filter, the second acoustic wave filter being a receive filter, and the first acoustic wave filter being associated with a different frequency band than the second acoustic wave filter;
- and
- while performing said filtering, providing a short circuit to ground at a frequency of a harmonic associated with the first acoustic wave filter with a trap circuit, the trap circuit including an acoustic wave resonator of the second acoustic wave filter and an inductor of the second acoustic wave filter.
Dependencies are inferred from the claim text.