Hybrid acoustic LC filter with harmonic suppression
AssigneeSkyworks Solutions, Inc.
InventorsWeimin Sun, Hai H. Ta, Bo Pan
Life of this patent
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Abstract
Aspects of this disclosure relate to hybrid acoustic LC filter with harmonic suppression. The hybrid acoustic LC filter includes a hybrid passive/acoustic and a non-acoustic LC filter cascaded with the hybrid passive/acoustic filter. The hybrid passive/acoustic filter can be configured to filter a radio frequency signal. The hybrid passive/acoustic filter can include acoustic resonators and a non-acoustic passive component. The non-acoustic LC filter can be configured to suppress a harmonic of the radio frequency signal. The non-acoustic LC filter can be a low pass filter or a harmonic notch filter, for example. Related multiplexers, wireless communication devices, and methods are disclosed.
Claims20
A hybrid acoustic LC filter with harmonic suppression, the hybrid acoustic LC filter comprising:
- a first hybrid passive/acoustic filter including at least first and second acoustic resonators, the first acoustic resonator in parallel with a first inductor, the first acoustic resonator and the first inductor in series with a second inductor, at least a first capacitor and a third inductor connected in parallel with the first and second acoustic resonators, and at least a second capacitor in parallel with a fourth inductor, the second capacitor and the fourth inductor connected in parallel with at least the second acoustic resonator;
- and
- a non-acoustic LC filter cascaded with at least the first hybrid passive/acoustic filter, the non-acoustic LC filter in electrical communication with an input and including at least a first LC resonant circuit connected to a series LC tank, a first bridge capacitor coupled to the input and the series LC tank.
A multiplexer comprising:
- a first filter configured to filter a radio frequency signal, the first filter including a hybrid passive/acoustic filter and a non-acoustic LC filter cascaded with the hybrid passive/acoustic filter, the hybrid passive/acoustic filter including at least first and second acoustic resonators, the first acoustic resonator in parallel with a first inductor, the first acoustic resonator and the first inductor in series with a second inductor, at least a first capacitor and a third inductor connected in parallel with the first and second acoustic resonators, and at least a second capacitor and a fourth inductor further connected in parallel with at least the second acoustic resonator, and the non-acoustic LC filter in electrical communication with an input and including a first LC resonant circuit connected to a series LC tank, and a first bridge capacitor coupled to the input and the series LC tank;
- and
- a second filter coupled to the first filter at a common node.
A wireless communication device comprising:
- a radio frequency front end including a filter configured to filter a radio frequency signal, the filter including a hybrid passive/acoustic filter and a non-acoustic LC filter cascaded with the hybrid passive/acoustic filter, the hybrid passive/acoustic filter including at least first and second acoustic resonators, the first acoustic resonator in parallel with a first inductor, the first acoustic resonator and the first inductor in series with a second inductor, at least a first capacitor and a third inductor connected in parallel with the first and second acoustic resonators, and at least a second capacitor in parallel with a fourth inductor, the second capacitor and the fourth inductor connected in parallel with at least the second acoustic resonator, and the non-acoustic LC filter in communication with an input and including a first LC resonant circuit connected to a series LC tank, and a first bridge capacitor coupled to the input and the series LC tank;
- and
- an antenna in communication with the radio frequency front end, the antenna configured to transmit a filtered version of the radio frequency signal.
Dependencies are inferred from the claim text.