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US 11,075,616 B2Granted
Filter including two types of acoustic wave resonators
AssigneeSkyworks Solutions, Inc.
InventorsYoshiaki Ando, Yasuyuki Saito, Hiroyuki Nakamura
Life of this patent
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Abstract
An acoustic wave device is disclosed. The acoustic wave device can include a transmit filter that includes bulk acoustic wave resonators and a series surface acoustic wave resonator that is coupled between the bulk acoustic wave resonators and a transmit output node. The acoustic wave device can also include a loop circuit that is coupled to the transmit filter. The loop circuit can generate an anti-phase signal to a target signal at a particular frequency.
Claims20
An acoustic wave device comprising:
- a transmit filter including a first stage in communication with an input of a final stage, the first stage having bulk acoustic wave resonators but not surface acoustic wave resonators, the final stage having at least a series surface acoustic wave resonator but not bulk acoustic wave resonators, an output of the final stage coupled to a common node, the transmit filter configured to filter a radio frequency signal, the series surface acoustic wave resonator having a higher suppression of a second harmonic of the radio frequency signal than the bulk acoustic wave resonators;
- a receive filter with an input connected to the common node, the receive filter further including a receive filter output node;
- a first loop circuit including a first plurality of surface acoustic wave resonators coupled to the common node and the input of the transmit filter, the first loop circuit configured to generate and apply a first anti-phase signal at the input of the transmit filter to a target signal;
- and
- a second loop circuit including a second plurality of surface acoustic wave resonators coupled to the receive filter output node and the input of the transmit filter, the second loop circuit configured to generate and separately apply a second anti-phase signal at the input of the transmit filter to the target signal.
2 more elements
A method of processing a radio frequency signal, the method comprising:
- filtering a transmit radio frequency signal with a transmit filter, the transmit filter including a first stage in communication with an input of a final stage, the first stage having bulk acoustic wave resonators but not surface acoustic wave resonators, the final stage having at least a series surface acoustic wave resonator but not bulk acoustic wave resonators, an output of the final stage coupled to a common node of the transmit filter, the series surface acoustic wave resonator having a higher suppression of a second harmonic of the radio frequency signal than the bulk acoustic wave resonators;
- filtering a receive radio frequency signal with a receive filter, the receive filter connected to the common node, the receive filter further including a receive filter output node;
- suppressing a target signal by applying to an input of the transmit filter a first anti-phase signal to the target signal with a first loop circuit including a first plurality of surface acoustic wave resonators coupled to the common node and the input of the transmit filter;
- and
- suppressing the target signal by separately applying to the input of the transmit filter a second anti-phase signal with a second loop circuit including a second plurality of surface acoustic wave resonators coupled to the receive filter output node and the input of the transmit filter.
2 more elements
Dependencies are inferred from the claim text.