PARALLEL ACOUSTIC HYBRID PASSIVE FILTER

Abstract

Parallel acoustic hybrid passive filter (130; 182; 200), comprising: a first subfilter (132; 202) with at least one first shunt circuit and a second shunt circuit coupled in parallel to the first shunt circuit, the first shunt circuit having at least one first acoustic shunt resonator in series with a first shunt inductor and the second shunt circuit having only one second shunt inductor coupled in parallel to the first acoustic shunt resonator and the first shunt inductor; and a second subfilter (134; 204) coupled in parallel to the first subfilter (132; 202) to a common input node and a common output node, comprising a third shunt circuit, a fourth shunt circuit coupled in parallel to the third shunt circuit, and at least one capacitor coupled in parallel to the third and fourth shunt circuits, of which the third shunt circuit has at least one second acoustic shunt resonator in series with a third shunt inductor, and the fourth shunt circuit has only one fourth shunt inductor coupled in parallel to the second acoustic shunt resonator and the third shunt inductor; a first series inductor (L1801; L2101) connected to the common input node such that the first series inductor (L1801; L2101) is connected in series with the first subfilter (132; 202) and the second subfilter (134; 204); and a fifth shunt inductor (L1802; L2102) connected to the common input node, and a sixth shunt inductor (L1813; L211) connected to the common output node; wherein the first subfilter (132; 202) and the second subfilter (134; 204) together are designed to filter a high-frequency signal.

Description

BACKGROUND Technical area

[0001] Embodiments of this disclosure relate to a hybrid acoustic LC filter. Description of the related technology

[0002] An acoustic wave filter (also called an acoustic wave filter) can contain a variety of acoustic resonators arranged to filter a high-frequency signal. Acoustic resonators can be arranged as conductor filters to filter the high-frequency signal. Examples of acoustic wave filters include surface acoustic wave (SAW) filters and bulk acoustic wave (BAW) filters. Acoustic wave filters can be used in electronic high-frequency systems. For example, filters in a mobile phone's high-frequency front end may include acoustic wave filters.

[0003] An LC filter contains at least one inductor and one capacitor. LC filters are non-acoustic filters that include passive components. LC filters can filter high-frequency signals.

[0004] Filtering relatively high-frequency signals and meeting tight filter specifications can be challenging. Therefore, improved filters are desirable for filtering relatively high-frequency signals and meeting operating characteristic specifications.

[0005] Publication US 6 606 016 B2 describes a surface acoustic wave (SAW) device comprising a first SAW filter connected between an input terminal and an output terminal, and a second SAW filter having a different center frequency than the first SAW filter, connected between the input terminal and the output terminal and in parallel with the first SAW filter.

[0006] Document US 2018 / 0076793A1 describes a filter circuit with a first and a second path extending between a first and a second node. The first path has a first inductor and a second inductor connected in series between the first and second nodes, with the first and second inductors being positively coupled and a first common node being provided between the first and second inductors.

[0007] Document US 2016 / 0268998A1 describes an acoustic filter device for telecommunications equipment comprising a first acoustic bandpass filter with a corresponding first passband and a second acoustic bandpass filter with a corresponding second passband. SUMMARY OF CERTAIN INVENTIVE ASPECTS

[0008] The innovations described in the claims each have several aspects, none of which alone is responsible for its desirable properties. Without limiting the scope of the claims, some distinctive features of this disclosure are now briefly described.

[0009] One aspect of the present invention relates to a parallel acoustic hybrid passive filter, comprising a first subfilter with at least one first shunt circuit and a second shunt circuit coupled in parallel to the first shunt circuit, the first shunt circuit comprising at least one first acoustic shunt resonator in series with a first shunt inductor and the second shunt circuit comprising only a second shunt inductor coupled in parallel to the first acoustic shunt resonator and the first shunt inductor, and a second subfilter coupled in parallel to the first subfilter to a common input node and a common output node, comprising a third shunt circuit, a fourth shunt circuit coupled in parallel to the third shunt circuit and at least one capacitor coupled in parallel to the third and fourth shunt circuits.of which the third shunt circuit comprises at least a second acoustic shunt resonator in series with a third shunt inductor, and the fourth shunt circuit comprises only a fourth shunt inductor coupled in parallel to the second acoustic shunt resonator and the third shunt inductor, a first series inductor connected to the common input node such that the first series inductor is connected in series with the first subfilter and the second subfilter, and a fifth shunt inductor connected to the common input node, and a sixth shunt inductor connected to the common output node, wherein the first subfilter and the second subfilter together are designed to filter a high-frequency signal.

[0010] Another aspect of the present invention relates to a multiplexer with a parallel acoustic hybrid passive filter, comprising a first filter comprising a first subfilter with at least one first shunt circuit and a second shunt circuit coupled in parallel to the first shunt circuit, of which the first shunt circuit has at least one first acoustic shunt resonator in series with a first shunt inductor and the second shunt circuit has only a second shunt inductor coupled in parallel to the first acoustic shunt resonator and the first shunt inductor, and a second subfilter coupled in parallel to the first subfilter to a common input node and a common output node, comprising a third shunt circuit, a fourth shunt circuit coupled in parallel to the third shunt circuit and at least one capacitor coupled in parallel to the third and fourth shunt circuits.of which the third shunt circuit comprises at least a second acoustic shunt resonator in series with a third shunt inductor, and the fourth shunt circuit comprises only a fourth shunt inductor coupled in parallel to the second acoustic shunt resonator and the third shunt inductor, a first series inductor connected to the common input node such that the first series inductor is connected in series with the first subfilter and the second subfilter, a fifth shunt inductor connected to the common input node, a sixth shunt inductor connected to the common output node, and a second filter coupled to the common input node and the common output node.

[0011] Another aspect of the present invention relates to a wireless communication device comprising a high-frequency front end with a filter configured to filter a high-frequency signal, and comprising a first subfilter with at least a first shunt circuit and a second shunt circuit coupled in parallel to the first shunt circuit, of which the first shunt circuit has at least a first acoustic shunt resonator in series with a first shunt inductor and the second shunt circuit has only a second shunt inductor coupled in parallel to the first acoustic shunt resonator and the first shunt inductor, and a second subfilter coupled in parallel to the first subfilter to a common input node and a common output node, comprising a third shunt circuit.a fourth shunt circuit coupled in parallel to the third shunt circuit and at least one capacitor coupled in parallel to the third and fourth shunt circuits, of which the third shunt circuit comprises at least one second acoustic shunt resonator in series with a third shunt inductor and the fourth shunt circuit only a fourth shunt inductor coupled in parallel to the second acoustic shunt resonator and the third shunt inductor, a first series inductor connected to the common input node such that the first series inductor is connected in series with the first subfilter and the second subfilter, a fifth shunt inductor connected to the common input node, a sixth shunt inductor connected to the common output node, and an antenna in conjunction with the high-frequency front end.

[0012] Another aspect of the present invention relates to a multiplexer with a hybrid acoustic passive filter, comprising a plurality of filters configured to filter respective high-frequency signals, each having a different passband, and of which at least a first filter has acoustic resonators and a non-acoustic passive component, a common filter coupled between each of the plurality of filters and a common node and having an LC component, and a high-frequency filter coupled to the common node.

[0013] Another aspect of the present invention relates to a wireless communication device comprising an antenna; and a multiplexer associated with the antenna, comprising a plurality of filters configured to filter respective high-frequency signals, and comprising a first filter comprising acoustic resonators and a non-acoustic passive component, a common filter coupled between each of the plurality of filters and a common node, comprising an LC component, and a high-frequency filter coupled to the common node.

[0014] Another aspect of the present invention relates to a multiplexer with acoustic hybrid passive filters, comprising a plurality of filters, the first of which has acoustic resonators and a first LC circuit, and the second of which has acoustic resonators and a second LC circuit, with different high-frequency passbands, a common high-pass filter coupled between each of the plurality of filters and a common node, and a low-pass filter coupled to the common node.

[0015] An example of this revelation is a cascaded filter for high-frequency filtering. The cascaded filter includes a hybrid acoustic LC filter and a non-acoustic LC filter cascaded with the hybrid acoustic LC filter. The hybrid acoustic LC filter is configured to filter a high-frequency signal. It includes a first acoustic resonator on an acoustic resonator raw chip, a second acoustic resonator, a capacitor outside the acoustic resonator raw chip, and an inductor outside the acoustic resonator raw chip. The non-acoustic LC filter includes an LC circuit.

[0016] The hybrid acoustic LC filter can further include a second inductor in parallel to the second acoustic resonator, wherein the second acoustic resonator is arranged as a shunt resonator in series with the inductor.

[0017] The first and second acoustic resonators can be shunt resonators. The capacitor and inductor can be arranged as an LC tank between the first and second acoustic resonators.

[0018] The first acoustic resonator can be coupled to a node in a signal path between the LC circuit and both the inductor and the capacitor.

[0019] The first acoustic resonator and the second acoustic resonator can be acoustic volume wave resonators. For example, the first acoustic resonator and the second acoustic resonator can be acoustic film volume wave resonators.

[0020] The LC circuitry of the non-acoustic LC filter can include integrated passive devices on an integrated passive device raw chip (also called a "die"). The inductor of the hybrid acoustic LC filter can be a surface-mount inductor. The inductor of the hybrid acoustic LC filter can include a conductive track or trace on a substrate. The integrated passive devices can include an LC shunt circuit (also called an LC shunt circuit) and a series LC resonant circuit (also called an LC resonant circuit).

[0021] The LC circuit (also called an LC circuit) of the non-acoustic LC filter can include a series LC resonant circuit and an LC shunt circuit. The series LC resonant circuit can include a parallel LC circuit. The LC shunt circuit can include a series LC circuit. The LC circuit of the non-acoustic LC filter can further include a second series shunt LC circuit.

[0022] The passband of the cascaded filter can be set by the non-acoustic LC filter. The first acoustic resonator can be positioned to cause rejection or blocking in a frequency band outside the passband. The lower limit of the passband can be at least 3 gigahertz. The passband can range from at least 3.3 gigahertz to 4.2 gigahertz.

[0023] Another example of this revelation is a multiplexer comprising a first filter coupled to a common node and a second filter coupled to the same common node. The first filter is configured to filter a high-frequency signal. It incorporates a hybrid acoustic LC filter and a non-acoustic LC filter cascaded with the hybrid acoustic LC filter. The hybrid acoustic LC filter includes a first acoustic resonator on an acoustic resonator raw chip, a second acoustic resonator, a capacitor outside the acoustic resonator raw chip, and an inductor outside the acoustic resonator raw chip.

[0024] The multiplexer can also include a third filter coupled to the common node. The second filter can include a second hybrid acoustic LC filter. The second filter can include a second non-acoustic LC filter.

[0025] Another example of this revelation is a wireless communication device comprising an antenna and a high-frequency front end associated with the antenna. The high-frequency front end includes a filter configured to filter a high-frequency signal for transmission over the antenna. The filter comprises a hybrid acoustic LC filter and a non-acoustic LC filter cascaded with the hybrid acoustic LC filter. The hybrid acoustic LC filter includes acoustic resonators on an acoustic resonator raw chip, a capacitor outside the acoustic resonator raw chip, and an inductor outside the acoustic resonator raw chip.

[0026] The wireless communication device can be a mobile phone.

[0027] Another example of this revelation is a cascaded high-frequency filter circuit comprising a hybrid acoustic LC filter, a non-acoustic LC filter including an LC circuit, and a switch for selectively coupling the hybrid acoustic LC filter and the non-acoustic LC filter. The hybrid acoustic LC filter is configured to filter a high-frequency signal. The hybrid acoustic LC filter includes an acoustic resonator on an acoustic resonator raw chip, a capacitor outside the acoustic resonator raw chip, and an inductor outside the acoustic resonator raw chip.

[0028] The cascaded filter circuit can further include a second non-acoustic LC filter, where the switch is configured to couple the hybrid acoustic LC filter and the non-acoustic LC filter in a first state, and where the switch is configured to couple the hybrid acoustic LC filter and the second non-acoustic LC filter in a second state. The non-acoustic LC filter can be a transmit filter and the second non-acoustic LC filter can be a receive filter.

[0029] The cascaded filter circuit can further include a second hybrid acoustic LC filter, where the switch is configured to couple the hybrid acoustic LC filter and the non-acoustic LC filter in a first state, and where the switch is configured to couple the second hybrid acoustic LC filter and the non-acoustic LC filter in a second state.

[0030] The hybrid acoustic LC filter can further include a second inductor in parallel to the acoustic resonator, in which the acoustic resonator is arranged in series with the inductor as a shunt resonator (also called a shunt resonator).

[0031] The hybrid acoustic LC filter can also include a second acoustic resonator. The first and second acoustic resonators can be shunt resonators. The capacitor and inductor can be arranged as an LC tank between the first and second acoustic resonators. The hybrid acoustic LC filter can further include a second inductor in series with the first acoustic resonator and a third inductor in series with the second acoustic resonator.

[0032] The acoustic resonator can be an acoustic volume wave resonator.

[0033] The LC circuit of the non-acoustic LC filter can include integrated passive devices of an integrated passive device raw chip. The inductor of the hybrid acoustic LC filter can be a surface-mount inductor. The inductor of the hybrid acoustic LC filter can include a conductive track or path on a substrate.

[0034] The passband of a cascaded filter, which includes the non-acoustic LC filter and the hybrid acoustic LC filter, can be set by the non-acoustic LC filter. A lower limit of the passband can be at least 3 gigahertz.

[0035] Another example of this revelation is a method for filtering a high-frequency signal. The method involves coupling a hybrid acoustic LC filter and a non-acoustic LC filter with a switch. The hybrid acoustic LC filter includes an acoustic resonator on an acoustic resonator raw chip, a capacitor outside the acoustic resonator raw chip, and an inductor outside the acoustic resonator raw chip. The method also involves filtering a high-frequency signal while the hybrid acoustic LC filter and the non-acoustic filter are coupled.

[0036] The method can further include decoupling the hybrid acoustic LC filter from the non-acoustic LC filter using the switch, and coupling the hybrid acoustic LC filter and a second non-acoustic LC filter using the switch. The method can further include supplying the high-frequency signal to the non-acoustic LC filter with a power amplifier and amplifying a filtered signal supplied by the second non-acoustic filter with a low-noise amplifier.

[0037] The filtering can involve using the acoustic resonator of the hybrid acoustic LC filter to block frequencies outside a passband of a filter that includes the hybrid acoustic LC filter and the non-acoustic LC filter.

[0038] The high-frequency signal can have a frequency in the range of 3 gigahertz to 5 gigahertz.

[0039] Another example of this revelation is a wireless communication device comprising an antenna and a high-frequency front end associated with the antenna. The high-frequency front end includes a filter configured to filter a high-frequency signal for transmission over the antenna. The filter includes a hybrid acoustic LC filter, a non-acoustic LC filter, and a switch configured to selectively couple the hybrid acoustic LC filter and the non-acoustic LC filter. The hybrid acoustic LC filter includes an acoustic resonator on an acoustic resonator raw chip and an LC component outside the acoustic resonator raw chip.

[0040] The wireless communication device can be a mobile phone.

[0041] Another example of this revelation is a parallel hybrid acoustic passive filter comprising a first subfilter and a second subfilter coupled in parallel to the first. The first subfilter includes a first acoustic resonator and a first non-acoustic passive component. The second subfilter includes a second acoustic resonator and a second non-acoustic passive component. The first and second subfilters are arranged together to filter a high-frequency signal.

[0042] The first and second subfilters can be arranged together as a bandpass filter with a single passband. The frequency response of the parallel hybrid acoustic passive filter can exhibit a first sub-passband corresponding to the first subfilter, a second sub-passband corresponding to the second subfilter, and a notch at a notch frequency between the first and second sub-passbands.

[0043] The first and second subfilters can be combined to form a bandstop filter with a stopband. The bandstop filter may have a notch in the stopband.

[0044] The first subfilter can include acoustic volume wave resonators, which contain the acoustic resonator.

[0045] The first non-acoustic passive component can include a first inductor and a second inductor, wherein the first inductor is in parallel to the acoustic resonator and wherein the acoustic resonator is arranged as a shunt resonator in series with the second inductor.

[0046] The first subfilter may further include an additional acoustic resonator, wherein the first acoustic resonator and the additional acoustic resonator are shunt resonators, and wherein the first non-acoustic passive component includes a capacitor and an inductor coupled as an LC tank between the first acoustic resonator and the additional acoustic resonator.

[0047] The second non-acoustic passive component may include an integrated passive device.

[0048] The first and second subfilters can have different passbands. A lower limit of a passband for the parallel hybrid acoustic passive filter can be at least 2 gigahertz.

[0049] Another example of this revelation is a multiplexer with a parallel hybrid acoustic passive filter. The multiplexer includes a first filter coupled to a common node and a second filter coupled to the same common node. The first filter is configured to filter a high-frequency signal. The first filter includes a first subfilter in parallel to a second subfilter. The first subfilter includes a first acoustic resonator and a first non-acoustic passive component. The second subfilter includes a second acoustic resonator and a second non-acoustic passive component.

[0050] The first filter can be a bandpass filter. The frequency response of the first filter can include a first sub-passband corresponding to the first sub-filter, a second sub-passband corresponding to the second sub-filter, and a notch at a notch frequency between the first and second sub-passbands. The second filter can be a bandstop filter.

[0051] The first filter can be a bandstop filter with a barrier band and a notch in the barrier band (also called a Sopp band).

[0052] The second filter may include another acoustic resonator and another non-acoustic passive component.

[0053] The first filter can have a first passband, the second filter can have a second passband, and the first passband can have a lower edge that has a higher frequency than an upper edge of the second passband.

[0054] The multiplexer can also include a third filter that is coupled to the common node.

[0055] The multiplexer can also include a common filter in series between the first filter and the common node, with the common filter also being in series between the second filter and the common node. The common filter can be a high-pass filter.

[0056] Another example of this revelation is a wireless communication device comprising a high-frequency front end and an antenna connected to the high-frequency front end. The high-frequency front end includes a filter configured to filter a high-frequency signal. The filter includes a first subfilter in parallel with a second subfilter. The first subfilter includes a first acoustic resonator and a first non-acoustic passive component. The second subfilter includes a second acoustic resonator and a second non-acoustic passive component.

[0057] Another example of this revelation is a multiplexer with a hybrid acoustic passive filter. The multiplexer includes a plurality of filters configured to filter respective high-frequency signals, a common filter coupled between each of the plurality of filters and a common node, and a high-frequency filter coupled to the common node. Each filter in the plurality of filters has a different passband. At least one initial filter in the plurality of filters includes acoustic resonators and a non-acoustic passive component.

[0058] The set of filters can include a first filter, a second filter, and a third filter. The first filter can be a first bandpass filter with a first passband. The second filter can be a second bandpass filter with a second passband. The third filter can be a bandstop filter with a stopband that incorporates both the first and second passbands.

[0059] The common filter can be a high-pass filter. The high-frequency filter can be a low-pass filter.

[0060] The common filter can be a non-acoustic LC filter. The common filter can include second acoustic resonators and an LC component.

[0061] The non-acoustic passive component may include an inductor arranged in parallel to a first acoustic resonator of the acoustic resonators.

[0062] The acoustic resonators can be implemented on an acoustic resonator raw chip. The non-acoustic passive component can include an inductor and a capacitor located outside the acoustic resonator raw chip.

[0063] A second filter from the set of filters can include a second acoustic resonator and a second non-acoustic passive component. The first filter can have a first passband, and the second filter can have a second passband. Both the first and second passbands can be in a frequency range of 2 to 5 gigahertz. Alternatively, both the first and second passbands can be in a frequency range of 2 to 3 gigahertz.

[0064] The multiplexer can be arranged as a quadplexer.

[0065] Another example of this revelation is the wireless communication device, which includes an antenna and a multiplexer connected to the antenna. The multiplexer includes a plurality of filters configured to filter respective high-frequency signals, a common filter coupled between each of the plurality of filters and a common node, and a high-frequency filter coupled to the common node. The plurality of filters includes a first filter containing acoustic resonators and a non-acoustic passive component.

[0066] A second filter from the set of filters can include a second acoustic resonator and a second non-acoustic passive component. The wireless communication device can be configured to support carrier aggregation at the common node. The carrier aggregation can include a first carrier and a second carrier, where the first carrier is within the first passband of the first filter and the second carrier is outside the first passband and the second passband of the second filter.

[0067] Another example of this revelation is a multiplexer with hybrid acoustic passive filters. The multiplexer incorporates a multitude of filters, including a first filter and a second filter with different high-frequency passbands, a common high-pass filter coupled between each of the multitude of filters and a common node, and a low-pass filter coupled to the common node. The first filter incorporates first acoustic resonators and a first LC circuit. The second filter incorporates a second acoustic resonator and a second LC circuit.

[0068] The multitude of filters can also include a bandstop filter with a blocking band that incorporates the passbands of the first and second filters.

[0069] Another example of this revelation is a hybrid acoustic LC filter with harmonic suppression. The hybrid acoustic LC filter comprises a hybrid passive / acoustic filter configured to filter a high-frequency signal and a non-acoustic LC filter cascaded with the hybrid passive / acoustic filter. The hybrid passive / acoustic filter includes acoustic resonators and a non-acoustic passive component. The non-acoustic LC filter is configured to suppress a harmonic of the high-frequency signal.

[0070] The non-acoustic LC filter can be a notch filter. The frequency response of the notch filter can exhibit one notch corresponding to a second harmonic of the high-frequency signal. Alternatively, the frequency response of the notch filter can exhibit two notches corresponding to different harmonics of the high-frequency signal.

[0071] The non-acoustic LC filter can be a low-pass filter.

[0072] The non-acoustic LC filter can include integrated passive devices of an integrated passive device raw chip.

[0073] The acoustic resonators can include acoustic volume wave resonators.

[0074] The non-acoustic passive component can include a first inductor and a second inductor. The acoustic resonators can include a first acoustic shunt resonator arranged in series with the first inductor and in parallel with the second inductor.

[0075] The acoustic resonators can include a first acoustic shunt resonator and a second acoustic shunt resonator. The non-acoustic passive component can include an LC tank coupled between the first acoustic shunt resonator and the second acoustic shunt resonator.

[0076] Another example of this revelation is a multiplexer comprising a first filter configured to filter a high-frequency signal and a second filter coupled to the first filter at a common node. The first filter incorporates a hybrid passive / acoustic filter and a non-acoustic LC filter, cascaded with the hybrid passive / acoustic filter. The hybrid passive / acoustic filter incorporates acoustic resonators and a non-acoustic passive component. The non-acoustic LC filter is configured to suppress a harmonic of the high-frequency signal.

[0077] The second filter can include a second acoustic resonator and a second non-acoustic passive component. The first filter can be a mid-band filter, and the second filter can be a high-band filter. The multiplexer can also include a low-band filter coupled to the first and second filters at a common node.

[0078] The non-acoustic LC filter can include integrated passive devices of an integrated passive device raw chip.

[0079] The non-acoustic passive component can include a first inductor and a second inductor. The acoustic resonators can include a first acoustic shunt resonator arranged in series with the first inductor and in parallel with the second inductor.

[0080] The acoustic resonators can include a first acoustic shunt resonator and a second acoustic shunt resonator. The non-acoustic passive component can include an LC tank coupled between the first acoustic shunt resonator and the second acoustic shunt resonator.

[0081] The acoustic resonators can include acoustic volume wave resonators.

[0082] Another example of this revelation is a wireless communication device comprising a high-frequency front end and an antenna connected to the high-frequency front end. The high-frequency front end includes a filter configured to filter a high-frequency signal. The filter comprises a hybrid passive / acoustic filter and an LC filter cascaded to the hybrid passive / acoustic filter. The hybrid passive / acoustic filter includes acoustic resonators and a non-acoustic passive component. The non-acoustic LC filter is configured to suppress a harmonic of the high-frequency signal. The antenna is configured to transmit a filtered version of the high-frequency signal with the harmonic suppressed.

[0083] The wireless communication device can be configured as a mobile phone.

[0084] The wireless communication device may further include a baseband processor and a transmitter-receiver, wherein the transmitter-receiver is connected to the high-frequency front end and is also connected to the baseband processor. BRIEF DESCRIPTION OF THE DRAWINGS

[0085] Embodiments of this disclosure are described by way of example with reference to the accompanying drawings. Fig. Figure 1A is a schematic block diagram of a cascaded filter comprising a hybrid acoustic LC filter and an LC filter according to one embodiment. Fig. Figure 1B is a schematic block diagram of a high-frequency system that includes a cascaded filter in a signal path between a power amplifier and an antenna according to one embodiment. Fig. Figure 1C is a schematic block diagram of a high-frequency system that includes a cascaded filter in a signal path between an antenna and a low-noise amplifier according to one embodiment. Fig. Figure 2A is a schematic block diagram of a cascaded filter circuit that includes a hybrid acoustic LC filter coupled to LC filters via a switch according to one embodiment. Fig. Figure 2B is a schematic block diagram of a cascaded filter circuit that includes an LC filter coupled via a switch to hybrid acoustic LC filters according to one embodiment. Fig. Figure 3A is a schematic block diagram of a high-frequency system with a cascaded filter circuit according to one embodiment. Fig. Figure 3B is a schematic block diagram of a high-frequency system with a cascaded filter circuit according to another embodiment. Fig. Figure 3C is a schematic block diagram of a high-frequency system with a cascaded filter circuit according to another embodiment. Fig. Figure 4A is a schematic block diagram of a multiplexer comprising a cascaded filter and another filter according to one embodiment. Fig. Figure 4B is a schematic block diagram of a multiplexer comprising a cascaded filter and another filter according to a different embodiment. Fig. Figure 5A is a schematic block diagram that includes a cascaded filter and another filter coupled to a common node via a switch according to one embodiment. Fig. Figure 5B is a schematic block diagram of a multiplexer comprising a cascaded filter and another filter coupled to a common node via a switch according to another embodiment. Fig. Figure 6A is a schematic diagram of a cascaded filter according to one embodiment. Fig. Figure 6B is a diagram of the frequency response of the cascaded filter of Fig. 6A. Fig. Figure 7 is a schematic diagram of a cascaded filter according to another embodiment. Fig. Figure 8 is a schematic diagram of a cascaded filter according to another embodiment. Fig. Figure 9 is a schematic diagram of a cascaded filter according to another embodiment. Fig. Figure 10 is a schematic diagram of a cascaded filter according to another embodiment. Fig. Figure 11A is a schematic diagram of a hybrid resonator according to one embodiment. Fig. 11B is a diagram of the frequency response of the hybrid resonator of Fig. 11A. Fig. Figure 12 is a schematic diagram of a hybrid resonator according to another embodiment. Fig. Figure 13 is a schematic block diagram of a hybrid parallel bandpass filter according to one embodiment. Fig. Figure 14 is a schematic block diagram of a diplexer comprising a hybrid parallel bandpass filter according to one embodiment. Fig. Figure 15 is a schematic block diagram of a triplexer comprising a hybrid parallel bandpass filter according to one embodiment. Fig. Figure 16 is a schematic block diagram of a triplexer comprising a common high-pass filter and a hybrid parallel band-pass filter according to one embodiment. Fig. Figure 17 is a schematic block diagram of a quadplexer comprising a common high-pass filter and a hybrid band-pass filter according to one embodiment. Fig. Figure 18 is a schematic diagram of a triplexer incorporating a hybrid parallel bandpass filter according to one embodiment. Fig. 19A illustrates simulation results of the triplexer from Fig. 18. Fig. Figure 19B illustrates diagrams of simulation results of the triplexer from Fig. 18 compared to a previous design. Fig. Figure 20 is a schematic block diagram of a hybrid parallel bandstop filter according to one embodiment. Fig. Figure 21 is a schematic diagram of a hybrid parallel bandstop filter according to one embodiment. Fig. Figure 22 is a diagram of the frequency response of the hybrid parallel bandstop filter of Fig. 21. Fig. Figure 23A is a schematic block diagram of a high-frequency system that includes a hybrid acoustic LC filter cascaded with a low-pass filter according to one embodiment. Fig. Figure 23B is a schematic block diagram of a high-frequency system comprising a hybrid acoustic LC filter cascaded with a second harmonic notch filter according to one embodiment. Fig. Figure 24A is a schematic diagram of an example low-pass filter. Fig. Figure 24B is a schematic diagram of another example low-pass filter. Fig. 24C is a schematic diagram of an exemplary second harmonic notch filter. Fig. 24D is a schematic diagram of an exemplary harmonic notch filter. Fig. 24E is a schematic diagram of an example of a second harmonic notch and a low-pass filter. Fig. Figure 25A is a schematic block diagram of a triplexer that includes a hybrid acoustic LC filter cascaded with a low-pass filter according to one embodiment. Fig. Figure 25B is a schematic block diagram of a triplexer comprising a hybrid acoustic LC filter cascaded with a second harmonic notch filter according to one embodiment. Fig. Figure 26 is a schematic diagram of a high-frequency module with a transmission path that includes a filter according to one embodiment. Fig. Figure 27 is a schematic diagram of a high-frequency module with a receive path that includes a filter according to one embodiment. Fig. Figure 28 is a schematic diagram of a high-frequency module that includes a filter according to one embodiment. Fig. Figure 29 is a schematic diagram of a wireless communication device which includes a filter according to one embodiment. Fig. Figure 30 is a schematic diagram of a wireless communication device which includes a filter according to another embodiment. DETAILED DESCRIPTION OF THE SPECIFIC EXECUTION FORMS

[0086] This disclosure relates to filters comprising an acoustic component and a non-acoustic passive component. Certain embodiments relate to a hybrid acoustic LC filter cascaded with an LC filter. Such filters can achieve a relatively wide passband and also meet strict out-of-band rejection requirements. Some embodiments relate to filters with an acoustic component and a non-acoustic passive component arranged in parallel. Such filters can achieve a relatively wide bandwidth and high rejection at stopbands relatively close to a passband without introducing significant loss in the passband.The embodiments disclosed herein relate to a non-acoustic LC filter cascaded with a hybrid passive / acoustic filter, the non-acoustic LC filter being arranged to suppress a harmonic of a high-frequency signal provided by the hybrid passive / acoustic filter. Such filters can achieve a relatively high bandwidth and high attenuation / rejection while simultaneously suppressing self-generated harmonics. Any suitable combination of features of the embodiments disclosed herein can be combined with one another. In various applications, two or more embodiments can be combined. Hybrid acoustic LC filter cascaded with LC filter

[0087] As fifth-generation (5G) wireless communication technology advances, non-acoustic broadband ultra-high-band (UHB) filter designs face challenges in meeting new carrier aggregation specifications. This new carrier aggregation generally generates more intermodulation frequencies, which can negatively impact receiver sensitivity. Consequently, carrier aggregation specifications may include stricter requirements for intermodulation distortion (IMD) rejection or blocking by the filter.

[0088] LC bandpass filters, such as those found in integrated passive devices (IPDs), offer advantages such as a wide bandwidth and relatively good broadband attenuation. However, LC bandpass filters do not exhibit particularly strong attenuation, especially at frequencies close to the passband. Non-acoustic bandpass filters can have significantly worse attenuation at frequencies near the passband compared to acoustic wave filters. This is generally undesirable when high attenuation is required for a stopband close to the passband.

[0089] Since acoustic resonator filters can provide higher suppression at frequencies near the passband without high losses at the edge roll-off, due to a higher quality factor (Q) than LC resonators, a passive non-acoustic filter can be cascaded with a hybrid acoustic LC filter to achieve both a wide bandwidth and strong suppression at the stopbands near the passband.

[0090] To provide carrier aggregation-IMD compliant filters with relatively strong attenuation at frequencies close to the filter's passband, a hybrid acoustic LC filter can be used. The hybrid acoustic LC filter can be a broadband filter incorporating one or more capacitors, one or more inductors, and one or more acoustic resonators. Hybrid acoustic LC filters can also include hybrid resonators, which consist of an acoustic resonator, at least one inductor, and at least one capacitor.

[0091] A hybrid acoustic LC filter can be cascaded with an LC filter to obtain a relatively low-loss, wide passband and to generate relatively strong rejection even at frequencies close to the passband of the cascaded filter. The LC filter can incorporate integrated passive devices (IPDs) on an integrated passive device raw chip ("die"). The hybrid acoustic LC filter can include one or more acoustic volume wave resonators. The combination of acoustic volume wave resonators and LC circuit elements in the cascaded filter can provide a relatively wide passband and also meet relatively stringent out-of-band rejection specifications.

[0092] Aspects of this revelation relate to a cascaded filter for filtering a high-frequency signal. The cascaded filter includes a hybrid acoustic LC filter and a non-acoustic LC filter cascaded with the hybrid acoustic LC filter. The hybrid acoustic LC filter includes acoustic resonators, a capacitor, and an inductor. The non-acoustic LC filter includes an LC circuit.

[0093] The cascaded filters described here can be used for various frequency bands, including wireless bands, provided acoustic resonators can be employed. For example, the cascaded filters can have a passband with a lower frequency limit of at least 2.5 gigahertz (GHz) or at least 3 GHz in certain applications. The cascaded filters can also have a relatively high upper limit of a passband in certain applications, such as approximately 4.5 GHz, 6 GHz, 8.5 GHz, or 10 GHz. The cascaded filters described here can be used in power amplifier modules, diversity receiver modules, or other suitable high-frequency front-end modules.The cascaded filters discussed here can meet the following design specifications: relatively low insertion loss (IL), relatively strong frequency cutoff, and relatively strong suppression of intermodulation frequency and harmonics.

[0094] Fig. Figure 1A is a schematic block diagram of a cascaded filter 10 comprising a hybrid acoustic LC filter 12 and an LC filter 14 according to one embodiment. The cascaded filter 10 has a first port RF1 and a second port RF2. The hybrid acoustic LC filter 12 and the LC filter 14 are arranged in series between the first port RF1 and the second port RF2. In certain applications, a high-frequency signal can propagate from the first port RF1 to the second port RF2. In other applications, a high-frequency signal can propagate from the second port RF2 to the first port RF1.

[0095] The hybrid acoustic LC circuit 12 includes one or more acoustic resonators, one or more inductors, and one or more capacitors. The one or more acoustic resonators can be BAW resonators, such as film bulk acoustic wave resonators (FBARs). BAW resonators can be advantageous, for example, for filtering signals with higher frequencies, such as frequencies above 2.5 GHz. Alternatively or additionally, the one or more acoustic resonators can include any other suitable acoustic wave resonators, such as one or more surface acoustic wave (SAW) resonators, one or more limiting acoustic wave resonators, and / or one or more lambda wave resonators.The hybrid acoustic LC filter 12 can incorporate a capacitor and an inductor outside the filter. The acoustic hybrid filter 12 can be a conductor filter. In certain applications, the acoustic hybrid filter 12 can be a fixed filter. A fixed filter can, in some cases, be implemented with less complexity than a tunable filter. The hybrid acoustic LC filter 12 can be tunable in some applications. If the hybrid acoustic LC filter 12 is tunable, notches and / or stopbands (barrier bands) can be tunable.

[0096] The LC circuit 14 includes one or more inductors and one or more capacitors. The LC circuit 14 can include one or more IPDs, one or more surface-mount components, one or more passive devices implemented on a packaging substrate, or any suitable combination thereof. Surface-mount components at some frequencies can exhibit a higher quality factor and lower insertion loss than IPDs and passive devices implemented on a packaging substrate. The one or more capacitors can be explicit capacitor(s) and / or parasitic capacitor(s). The LC circuit (also referred to as an LC circuit) 14 can also implement impedance matching.

[0097] Fig. Figure 1B is a schematic block diagram of a high frequency (RF) system 15 which includes the cascaded filter 10 in a signal path between a power amplifier 16 and an antenna 17 according to one embodiment. Fig. Figure 1B illustrates that the cascaded filter 10 can be integrated into a transmit signal path. In certain applications, the first port RF1 of the cascade filter 10 can be electrically coupled to an output of the power amplifier 16, and a second port RF2 of the cascade filter 10 can be electrically coupled to the antenna 17. In some applications, the first port RF1 of the cascade filter 10 can be electrically coupled to the antenna 17, and the second port RF2 of the cascade filter 10 can be electrically coupled to the output of the power amplifier 16.

[0098] Fig. Figure 1C is a schematic block diagram of an RF system 18 which includes a cascaded filter 10 in a signal path between an antenna 17 and a low-noise amplifier 19 according to one embodiment. Fig. Figure 1C illustrates that the cascaded filter 10 can be integrated into a receive signal path. In certain applications, the first port RF1 of the cascaded filter 10 can be electrically coupled to an input of the low-noise amplifier 19, and a second port RF2 of the cascaded filter 10 can be electrically coupled to the antenna 17. In some applications, the first port RF1 of the cascade filter 10 can be electrically coupled to the antenna 17, and the second port RF2 of the cascade filter 10 can be electrically coupled to the input of the low-noise amplifier 19.

[0099] Fig. Figure 2A is a schematic block diagram of a cascaded filter circuit 20, which includes a hybrid acoustic LC filter 12 coupled to LC filters 14A and 14N via a switch 22 according to one embodiment. The cascaded filter circuit 20 can share a hybrid acoustic LC filter 12 among a plurality of LC circuits 14A to 14N. The switch 22 can electrically connect the hybrid acoustic LC filter 12 in series with a selected LC circuit to implement a cascaded filter. The switch 22 shown is a multi-way radio frequency switch. The switch 22 can electrically couple the hybrid acoustic LC filter 12 to a selected LC filter. The switch 22 can have any number of paths, and the cascaded filter circuit 20 can include a corresponding number of LC filters 14A to 14N. The LC filters 14A and 14N shown are each equipped with a corresponding RF port. 21 or RF 2NThe hybrid acoustic LC filter 12 is coupled to the cascaded filter circuit 20. In the cascaded filter circuit 20, the hybrid acoustic LC filter 12 can achieve relatively strong suppression at frequencies relatively close to the passband in combination with one or more selected LC filters 14A to 14N. In certain applications, the hybrid acoustic LC filter 12 can be tuned to adjust the suppression at frequencies relatively close to the passband for one or more selected LC filters 14A to 14N that are electrically coupled to it.

[0100] Fig. Figure 2B is a schematic block diagram of a cascaded filter circuit 25, which includes an LC filter 14 coupled via a switch 22 to hybrid acoustic LC filters 12A and 12N according to one embodiment. The cascaded filter circuit 20 can share an LC filter 14 with a variety of hybrid acoustic LC circuits 12A to 12N, i.e., use them jointly. The switch 22 can electrically connect the LC filter 14 in series with a selected hybrid acoustic LC circuit to implement a cascaded filter. The switch 22 shown is a multi-way high-frequency switch. The switch 22 can electrically couple the LC filter 14 with a selected hybrid acoustic LC filter. The switch 22 can have any number of switching positions i.e. switching paths, and the cascaded filter circuit 25 can have a corresponding number of hybrid acoustic LC filters 12A to 12N.The illustrated hybrid acoustic LC filters 12A and 12N each have a corresponding RF port. 11 or RF 1N coupled to the cascaded filter circuit 25.

[0101] Fig. Figure 3A is a schematic block diagram of a high-frequency system 30A with a cascaded filter circuit according to one embodiment. The high-frequency system 30 is an example system that includes the cascaded circuit 20. Fig. 2A can be realized. As shown, an antenna 32 is coupled to the hybrid acoustic LC filter 12, the switch 22 is a transmit / receive switch, and the LC filters 14A and 14B are connected to a power amplifier 34 and a low-noise amplifier 36, respectively. The cascaded circuit 25 of Fig. 2B can be implemented in a high-frequency system similar to the high-frequency system 30A.

[0102] Fig. Figure 3B is a schematic block diagram of a high-frequency system 30B with a cascaded filter circuit according to a further embodiment. Fig. Figure 3B illustrates that the LC circuits 14A and 14B can be located in different transmission paths with the respective power amplifiers 34A and 34B. Accordingly, the hybrid acoustic LC filter 12 can be integrated into (a) a cascaded filter circuit with the LC filter 14A between the power amplifier 34A and the antenna 32, and (b) a cascaded filter circuit with the LC filter 14B between the power amplifier 34B and the antenna 32.

[0103] Fig. Figure 3C is a schematic block diagram of a high-frequency system 30C with a cascaded filter circuit according to another embodiment. The cascaded filter of the high-frequency system 30C can be used, for example, in a diversity receiver application. Fig. Figure 3C illustrates that the LC circuits 14A and 14B can be located in different receive paths with the respective low-noise amplifiers 36A and 36B. Accordingly, the hybrid acoustic LC filter 12 can be integrated into (a) a cascaded filter circuit with the LC filter 14A between the low-noise amplifier 36A and the antenna 32, and (b) a cascaded filter circuit with the LC filter 14B between the low-noise amplifier 36B and the antenna 32.

[0104] Fig. Figure 4A is a schematic block diagram of a multiplexer 40 comprising a cascaded filter and another filter according to one embodiment. The multiplexer 40 includes a plurality of filters coupled to a common node. As shown, a cascaded filter comprising an LC filter 14 and a hybrid acoustic LC filter 12, and another filter(s) 42 are coupled to each other at the common node. In the multiplexer 40, the LC filter 14 is coupled to the common node via the hybrid acoustic LC filter 12. The multiplexer 40 can be a duplexer with two filters, a triplexer with three filters, a quadplexer with four filters, etc. The other filter(s) 42 can comprise any number of filters. The other filter(s) 42 can be one or more LC filters (e.g.,IPD filters), one or more acoustic wave filters, one or more hybrid acoustic LC filters, the like, or a suitable combination thereof.

[0105] Fig. Figure 4B is a schematic block diagram of a multiplexer 45, which includes a cascaded filter and another filter according to a different embodiment. The multiplexer 45 is like the multiplexer 40 of Fig. 4A, except that the hybrid acoustic LC filter 12 is coupled to the common node via the LC filter 14.

[0106] A large number of filters can be connected via a switch to a common node, such as an antenna node. Fig. Figure 5A is a schematic diagram of a high-frequency system 50 comprising a cascaded filter and another filter 42 coupled to a common node via a switch 52. The cascaded filter, the other filter 42, and the switch 52 can implement switch multiplexing. The switch multiplexing can implement on-demand multiplexing.

[0107] Fig. Figure 5B is a schematic block diagram of a high-frequency system 55 comprising a cascaded filter and another filter coupled to a common node via a switch according to another embodiment. The high-frequency system 55 is, like the high-frequency system 50, made of Fig. 5A, except that the hybrid acoustic LC filter 12 and the LC filter 14 are arranged in a different order.

[0108] Fig. Figure 6A is a schematic diagram of a cascaded filter 60 according to one embodiment. The cascaded filter 60 can be a bandpass filter arranged to allow high-frequency signals with a frequency above 3 GHz to pass through, such as Band 42, Band 43, and / or Band 48 signals. In such applications, the acoustic wave resonators of the filter 60 can be BAW resonators. The filter 60 can be used in applications for 5th generation (5G) wireless systems. 5G technology can be referred to as 5G New Radio (NR). The cascaded filter 60 includes a hybrid acoustic LC filter 62 cascaded with an LC filter 64. The hybrid acoustic LC filter 62 is an example of the hybrid acoustic LC filter 12. The LC filter 64 is an example of the LC filter 14.

[0109] The hybrid acoustic LC filter 62 includes acoustic resonators A61 and A62, inductors L601, L602, L603, L604, L605, and L606, as well as capacitors C601, C602, C603, and C604. Acoustic resonators A61 and A62 can be BAW resonators such as FBARs. In some cases, acoustic resonators A61 and A62 can be a SAW resonator, a temperature-compensated SAW resonator (TCSAW), an acoustic limiting wave resonator, a lambda wave resonator, a similar resonator, or a suitable combination thereof. The inductors L601, L602, L603, L604, L605 and L606, as well as the capacitors C601, C602, C603 and C604, are LC / non-acoustic components. The LC / non-acoustic components of the hybrid acoustic LC filter 62 can be implemented outside of a bare chip that includes the acoustic resonators A61 and A62.The LC / non-acoustic components of the hybrid acoustic LC filter 62 can include one or more inductors and / or capacitors in surface mount technology (SMT). In some cases, the LC / non-acoustic components of the hybrid acoustic LC filter 62 can include one or more IPDs and / or one or more inductive traces or tracks on a packaging substrate.

[0110] As shown, the hybrid acoustic LC filter 62 incorporates a hybrid resonator structure with inductor L602 in parallel to acoustic resonator A62, and inductor L603 in series with inductor and acoustic resonator A62. Further details of this hybrid resonator structure are provided in the Fig. 11A and Fig. Figure 11B shows the LC filter 62. The LC tank shown also includes an LC tank between acoustic nodes, at which the acoustic resonators A61 and A62 are arranged in series with the respective inductors L603 and L606 in shunt circuits, the LC tank containing the capacitor C604 and the inductor L605. Further details of this hybrid resonator structure can be found in Figure 11B. Fig. 12 proven.

[0111] The LC filter 64 can be a bandpass filter. For example, the LC filter 64 can be a Band 42 / Band 43 bandpass filter. The LC filter 64 includes an IPD part 65 on an IPD raw chip, a packaging substrate part 66 containing traces on the packaging substrate, and an SMT part 67 containing SMT components. The IPD part 65 includes the IPD capacitors C605, C606, C607, C608, C609, and C610, as well as the IPD inductor L608. The packaging substrate part 66 includes inductive traces arranged as inductors, i.e., inductors L609, L610, L611, and L612. The SMT part 67 includes the SMT capacitors C611 and C612.

[0112] As shown, the LC filter 64 includes bridge capacitors, LC resonant circuits, coupling capacitors, and a series LC tank. A first bridge capacitor, C610, has one end coupled to a series LC tank and a second end coupled to an input node of the LC filter 64. The series LC tanks include capacitor C605 and inductor L608. The first bridge capacitor, C610, is connected in parallel to the three coupling capacitors, C606, C607, and C608.

[0113] A first LC resonant circuit is an LC shunt resonant circuit. As shown, the first LC resonant circuit includes a shunt inductor L611 in parallel with a series LC circuit containing inductor L612 and capacitor C612. A second bridge capacitor C609 has one end coupled to the series LC circuit and one end connected to the first LC resonant circuit. The second bridge capacitor C609 is connected in parallel with two coupling capacitors C606 and C607. A second LC resonant circuit is an LC shunt resonant circuit. As shown, the second LC resonant circuit includes a shunt inductor L609 in parallel with a series LC circuit containing inductor L610 and capacitor C611.

[0114] A first coupling capacitor C608 is connected between an input of the filter and a node where the first coupling capacitor C608 is coupled to the first LC resonant circuit and a second coupling capacitor C607. The second coupling capacitor C607 is connected in series between the first coupling capacitor C608 and the third coupling capacitor C606. The second coupling capacitor C607 is also coupled between the first LC resonant circuit and the second LC resonant circuit. A third coupling capacitor C606 is connected between the series LC tank and a node where the third coupling capacitor C606 is coupled to the second LC resonant circuit and the second coupling capacitor C607. The illustrated series LC tank is a parallel LC circuit.

[0115] Fig. Figure 6B is a diagram of the frequency response of the cascaded filter 60. Fig. 6A. The curve shown represents a frequency response of the cascaded filter 60 of Fig. 6A. The stepped lines represent a design specification or filter mask. The curve in Fig. Figure 6B shows that the frequency response of the cascaded filter 60 in Fig. 6A conforms to the design specifications except for 9 GHz. As shown, the filter response has two zeros generated by the acoustic shunt resonators A61 and A62. The frequency response exhibits a relatively strong roll-off, i.e., a relatively strong roll-off, at the edges (i.e., flanks) of the passband. The non-acoustic LC filter 64 from Fig. 6A can provide the relatively large bandwidth. The frequency response has a relatively large bandwidth, ranging from approximately 3.1 GHz to 4.2 GHz in the depicted frequency response. Accordingly, the cascaded filter 60 can Fig. 6A have a bandwidth of at least 1 GHz. In some other embodiments, cascaded filters with a hybrid acoustic LC filter cascaded with a non-acoustic LC filter can have a bandwidth in a range significantly larger than that determined by an acoustic resonator coupling factor, such as a bandwidth of about 3.3 GHz to 4.2 GHz or a bandwidth of about 4.4 GHz to 5 GHz.

[0116] The cascaded filter 60 from Fig. 6A is an example of a non-acoustic LC filter cascaded with a hybrid acoustic LC filter. The principles and advantages described here can be implemented in a variety of other filter topologies. Some examples of filter topologies are given in the Fig. 7, Fig. 8, Fig. 9 to Fig. Figure 10 illustrates these filters, which can be used, for example, in 5G applications. These filters include acoustic resonators such as FBARs, as well as inductors and capacitors. The inductors and capacitors can include one or more IPDs, one or more surface-mount inductors, one or more surface-mount capacitors, one or more inductive traces on a packaging substrate, the like, or a suitable combination thereof. The exemplary filters of the Fig. 7, Fig. 8, Fig. 9 to Fig. Figure 10 illustrates filters for various applications and design specifications. Any suitable combination of features from these filters can be implemented together and / or in accordance with all other principles and benefits described here.

[0117] Fig. Figure 7 is a schematic diagram of a cascaded filter 70 according to another embodiment. The cascaded filter 70 comprises a hybrid acoustic LC filter 72 cascaded with an LC filter 74. The hybrid acoustic LC filter 72 is an example of the hybrid acoustic LC filter 12. The LC filter 74 is an example of the LC filter 14. The cascaded filter 70 can, for example, be a receive filter. The cascaded filter 70 can have a passband of 3.4 GHz to 3.7 GHz in certain applications.

[0118] The hybrid acoustic LC filter 72 includes the acoustic resonators A71, A72, A73, A74, A75, and A76; the capacitors C701, C702, and C703; and the inductors L701, L702, L703, L704, L705, L706, L707, L708, and L709. The acoustic resonators A71 to A76 can be BAW resonators. The capacitors C701 to C703 can be SMT capacitors. The inductors L701 to L709 can include a combination of SMT inductors and conductive traces of a packaging substrate.

[0119] The illustrated LC filter 74 includes capacitors C704 and C705 as well as inductors L710 and L711. In certain embodiments, the LC filter 74 can be implemented using IPD capacitors and inductors on an IPD raw chip. In some other embodiments, the LC filter 74 can be implemented using SMT capacitors and inductors on an IPD raw chip.

[0120] Fig. Figure 8 is a schematic diagram of a cascaded filter 80 according to another embodiment. The cascaded filter 80 comprises a hybrid acoustic LC filter 82 cascaded with an LC filter 84. The hybrid acoustic LC filter 82 is an example of the hybrid acoustic LC filter 12. The LC filter 84 is an example of the LC filter 14. In one embodiment, the cascaded filter 80 can be a bandpass filter with a passband of approximately 3.3 GHz to 4.2 GHz. According to another embodiment, the cascaded filter can have a passband of 3.4 GHz to 3.7 GHz. The cascaded filter 80 can, for example, be a receive filter.

[0121] The hybrid acoustic LC filter 82 includes the acoustic resonators A81, A82, A83, A84, and A85, the capacitors C801 and C802, and the inductors L801, L802, L803, L804, L805, and L806. The acoustic resonators A81 to A85 can be BAW resonators. The capacitors C801 and C802 can be SMT capacitors. The inductors L801 to L805 can be a combination of SMT inductors and traces of a packaging substrate. A hybrid resonator including the inductors L802 and L803 and the acoustic resonators A81, A82, and A83 can be similar to the one in the Fig. 11A and Fig. The hybrid resonator described in 11B can operate. The hybrid conductor structure, which includes inductors L802 to L805, capacitor C802 and acoustic resonators A81 to A85, can operate similarly to the hybrid conductor structure described with reference to Fig. 12 is described.

[0122] The illustrated LC filter 84 includes capacitors C803, C804, C805, C806 and C807, as well as inductors L806, L807, L808 and L809. The LC filter 84 can include one or more IPDs, one or more SMT components, one or more conductive traces of a substrate, or a suitable combination thereof.

[0123] Fig. Figure 9 is a schematic diagram of a cascaded filter 90 according to another embodiment. The cascaded filter 90 comprises a hybrid acoustic LC filter 92 cascaded with an LC filter 94. The hybrid acoustic LC filter 92 is an example of the hybrid acoustic LC filter 12. The LC filter 94 is an example of the LC filter 14. In certain embodiments, the cascaded filter 90 may include surface-mounted passive components, other than shunt inductors, connected between acoustic resonators and ground, such shunt inductors being printed traces or tracks on a packaging substrate. Therefore, in such embodiments, the cascaded filter 90 does not include an IPD. The cascaded filter 90 may, in certain cases, be a receive filter coupled between an antenna switch and a low-noise amplifier.The cascaded 90 filter can improve insertion loss compared to previous designs. The cascaded 90 filter can be used as a receive filter.

[0124] The hybrid acoustic LC filter 92 includes acoustic resonators A91, A92, and A93, capacitors C901, C902, C903, and C904, and inductors L901, L902, L903, and L904. Acoustic resonators A91 to A93 can be BAW resonators. Capacitors C901 to C904 can be SMT capacitors. Inductors L901 to L904 can be a combination of SMT inductors and conductive traces of a packaging substrate.

[0125] The illustrated LC filter 94 includes capacitors C903, C904, and C905, as well as inductors L905, L906, L907, and L908. The LC filter 94 can include one or more IPDs, one or more SMT components, one or more conductive traces of a substrate, or a suitable combination thereof. In one embodiment, the LC filter 94 consists of SMT inductors and capacitors.

[0126] Fig. Figure 10 is a schematic diagram of a cascaded filter according to another embodiment. The cascaded filter 100 includes a hybrid acoustic LC filter 102 cascaded with an LC filter 104. The hybrid acoustic LC filter 102 is an example of the hybrid acoustic LC filter 12. The LC filter 104 is an example of the LC filter 14. In certain embodiments, the cascaded filter 100 may include IPDs, surface-mounted passive components, inductive traces on a laminate, and FBARs. The cascaded filter 100 may, in certain cases, be a receive filter coupled between an antenna switch and a low-noise amplifier. The cascaded filter 100 may be a bandpass filter with a passband of approximately 3.3 GHz to 4.2 GHz. The cascaded filter 100 is, in certain embodiments, a receiving filter.

[0127] The hybrid acoustic LC filter 102 comprises acoustic resonators A101, A102, and A103, capacitors C1001 and C1002, and inductors L1001, L1002, L1003, L1004, L1005, and L1006. Acoustic resonators A101 to A103 can be BAW resonators. Capacitors C1001 and C1002 can be surface-mounted (SMT) and / or in-packaged (IPD) capacitors. Inductors L1001 to L1006 can be one or more SMT inductors, one or more IPD inductors, one or more conductive traces of a packaging substrate, or a suitable combination thereof. In one embodiment, the inductors L1001 to L1006 include at least one SMT inductor, at least one IPD inductor and at least one conductive track of a packaging substrate.

[0128] A hybrid resonator incorporating inductors L1002 and L1003 and acoustic resonator A102 can operate similarly to the hybrid resonator described in relation to the Fig. 11A and Fig. 11B is described. A hybrid resonator incorporating inductors L1005 and L1006 and acoustic resonator A103 can operate similarly to the hybrid resonator described with reference to the Fig. 11A and Fig. 11B is described. The hybrid conductor structure, which includes inductors L802 to L806, capacitor C1002 and acoustic resonators A102 to A103, can be described similarly to the one referred to in Fig. 12 described hybrid conductor structures work.

[0129] The illustrated LC filter 104 includes capacitors C1003, C1004, C1005, C1006, and C1007, as well as inductors L1007, L1008, L1009, and L1010. The LC filter 104 can include one or more IPDs, one or more SMT components, one or more conductive traces of a substrate, or a suitable combination thereof. In one embodiment, the LC filter 104 includes at least one SMT component, at least one IPD, and at least one conductive trace of a packaging substrate.

[0130] The hybrid acoustic LC filters discussed here can incorporate a variety of hybrid resonators, each including an acoustic wave resonator and a non-acoustic passive component. Exemplary hybrid resonators are described with reference to the following: Fig. Sections 11A to 12 are discussed. These hybrid resonators can be used in conjunction with all suitable embodiments described here.

[0131] Fig. Figure 11A is a schematic diagram of a hybrid resonator 110 according to one embodiment. The hybrid resonator 110 comprises an acoustic resonator 112, a first inductor 114, and a second inductor 116. The acoustic resonator 112 is arranged as a shunt resonator. The acoustic resonator 112 can be, for example, an FBAR. The acoustic resonator 112 can be any other suitable acoustic resonator. The acoustic resonator 112 is connected in parallel with the first inductor 114. The acoustic resonator 112 is connected in series with the second inductor 116. The combination of the inductors 114 and 116 and the acoustic resonator 112 can produce a pair of notches that are relatively close to the passbands without significantly affecting the transmission losses. The notches can be located in a range of approximately 1.1 GHz to 8.5 GHz from a lower or upper limit of a passband.

[0132] Fig. Figure 11B is a diagram of the frequency response of the hybrid resonator 110 made of Fig. 11A. The frequency response illustrates the pair of notches that are related to Fig. 11A were discussed. The frequency response also illustrates that the simulated hybrid resonator 110 does not introduce any significant transmission losses.

[0133] Fig. Figure 12 is a schematic diagram of a hybrid resonator 120 according to another embodiment. The hybrid resonator 120 is a hybrid conductor structure. The hybrid resonator 120 includes a first series shunt circuit, an LC tank, and a second series shunt circuit. The first series shunt circuit includes a first acoustic resonator 122 and a first inductor 123. The second series shunt circuit includes a second acoustic resonator 124 and a second inductor 125. The LC tank includes a capacitor 126 in parallel with a third inductor 127. The hybrid resonator 120 includes the LC tank between acoustic nodes. This can provide both inter-resonator impedance matching and a notch at the far end of the frequency response of a filter that includes the hybrid resonator 120. The hybrid resonator 120 includes a hybrid conductor structure.The Hybrid Resonator 120 can be used, for example, for low-pass and / or high-pass filters. The Hybrid Resonator 120 is a hybrid conductor topology. Parallel Hybrid Acoustic Passive Filter

[0134] As 5G wireless communication technology advances, new carrier aggregation (CA) specifications may require stricter intermodulation distortion (IMD) suppression for a filter. Such a new CA may incorporate a greater number of multiplexing filters than a previous CA. To provide CA-compliant IMD suppression filters with strong suppression at frequencies near the passband, acoustically assisted filters with hybrid resonators, such as hybrid acoustic LC resonators, can be designed to provide a relatively low-loss, wide passband and relatively strong suppression at frequencies near the passband. Acoustic resonators can generate harmonics when high power is applied.The harmonics generated by an acoustic surface wave device or an acoustic volume wave device may escape into a higher frequency band and / or exhibit emission above a standard specification.

[0135] To provide CA-compliant multiplexing filters with strong edgeband frequency suppression, hybrid acoustic LC broadband filters can be integrated into some or all of the passband arms. To reduce and / or minimize the use of acoustic filter raw chips and passive components, either the hybrid acoustic LC filter, an integrated passive device (IPD) filter, or a passive low-pass (LP) or high-pass (HP) filter can be shared by two or more passband arms. To achieve specific strong suppression in the high-band arm (e.g., in Wi-Fi 2.4 GHz) within a bandpass filter (BPF), a parallel acoustic hybrid LC filter can be integrated. In some cases, the parallel acoustic hybrid LC filter can be cascaded with another filter, such as a passive non-acoustic filter.

[0136] Hybrid acoustic LC filters with parallel hybrid acoustic LC subfilters are disclosed. In one embodiment, a parallel acoustic LC filter includes a first subfilter configured to filter a high-frequency signal and a second subfilter connected in parallel to the first subfilter. The first subfilter includes a first acoustic resonator and a first LC component. The second subfilter includes a second acoustic resonator and a second LC component. The parallel hybrid acoustic LC filter can be implemented in a multiplexer comprising a plurality of filters coupled to one another at a common node. A parallel acoustic hybrid filter can implement all the suitable principles and advantages of the acoustic LC circuits disclosed herein. As an example, a parallel acoustic hybrid LC filter can implement the hybrid resonator 110 from Fig. 11A. As a further example, a parallel acoustic hybrid LC filter can be a hybrid conductor structure 120 made of Fig. 12 are included.

[0137] Parallel acoustic hybrid LC filters can be bandpass filters. Parallel acoustic hybrid LC filters can be bandstop filters. A parallel acoustic hybrid LC filter can be located in a high-band path. Such filters can reduce and / or minimize design complexity. Furthermore, such filters can be used in certain applications with fewer passive components and / or in a smaller physical area. The parallel passive hybrid filters presented here can meet the design specifications for high-band paths, such as the desired attenuation at specific frequencies (e.g., Wi-Fi frequency bands). This makes it possible to share the high-band path simultaneously from a transmit and a receive path.

[0138] A parallel acoustic hybrid LC filter can provide a relatively wide bandwidth and strong attenuation in a specific frequency band. The parallel acoustic hybrid LC filter can incorporate hybrid filters for different frequency bands in parallel and be arranged to ensure strong attenuation for another frequency band. For example, a parallel band 40 and band 41 hybrid acoustic LC bandpass filter can provide a bandwidth sufficiently wide for passband 40 and band 41 signals while simultaneously providing strong attenuation for a 2.4 GHz Wi-Fi frequency band. In some embodiments, a passive non-acoustic filter can be cascaded with the parallel acoustic hybrid LC filter to achieve both a wide bandwidth and strong attenuation in a high-band path.According to certain embodiments, a triplexer can be achieved by a parallel acoustic hybrid LC filter and two additional filters coupled to a common node. For example, a low-band (LB) / mid-band (MB) / high-band (HB) triplexer can include an LB filter, an MB filter, and an HB filter implemented by an acoustic hybrid LC filter that incorporates a Band 40 filter in parallel with a Band 41 filter. Such a triplexer can effectively function as a quadplexer to support system-level carrier aggregation applications.

[0139] Fig. Figure 13 is a schematic block diagram of a hybrid parallel bandpass filter 130 according to one embodiment. The parallel hybrid bandpass filter 130 comprises a first bandpass filter 132 and a second bandpass filter 134 arranged in parallel to each other. The first bandpass filter 132 and the second bandpass filter 134 are arranged for filtering high-frequency signals. The first bandpass filter 132 is a hybrid acoustic passive filter comprising a first acoustic resonator and a first non-acoustic passive component. The first non-acoustic passive component may include at least one inductor and one capacitor. The second bandpass filter 134 can be a hybrid acoustic passive filter comprising a second acoustic resonator and a second non-acoustic passive component. The second non-acoustic passive component may include at least one inductor and one capacitor.The first bandpass filter 132 has a first passband, and the second bandpass filter 134 has a second passband. By connecting two filters in parallel, the bandwidth of the parallel filter can be increased compared to either of the individual filters contained within the parallel filter. The hybrid parallel bandpass filter 130 has a passband that includes both the first and second passbands. The frequency response of the hybrid parallel bandpass filter 130 may exhibit a notch in its passband between the first and second passbands. The notch could, for example, be for a 2.4 GHz Wi-Fi band. A symbol 135 for the hybrid parallel bandpass filter 130 is shown in [reference missing]. Fig. 13 also shown.

[0140] Although embodiments relating to parallel acoustic hybrid LC filters for high-band filters are discussed, any of the suitable principles and advantages described here can be applied to mid-band filters, low-band filters, or other filters that could benefit from the features described herein.

[0141] The parallel acoustic hybrid LC filters described here can be implemented in power amplifier modules, diversity receiver modules, or other suitable high-frequency front-end modules.

[0142] The parallel acoustic hybrid passive filters discussed here can be implemented in multiplexers containing a multitude of filters coupled together at a common node. Such multiplexers can include a diplexer, a triplexer, a quadplexer, etc. Any number of filters can be coupled at a common node in a multiplexer. A multitude of filters can be coupled together at a common node via a multi-way RF switch to implement switch-plexing functionality. Some examples of multiplexers containing parallel acoustic hybrid passive filters are given with reference to the Fig. 14, Fig. 15 to Fig. 16 described. The exemplary multiplexers include a parallel acoustic hybrid filter 130 made of Fig. 13 and can be implemented according to all suitable principles and advantages of the parallel acoustic hybrid filter 130.

[0143] Fig. Figure 14 is a schematic block diagram of a diplexer 140, which includes a hybrid parallel bandpass filter 130 according to one embodiment. The diplexer 140 includes a hybrid parallel bandpass filter 130 and a second filter 144. The parallel acoustic hybrid filter 130 can be a high-band filter, and the second filter 144 can be a mid-band filter, as shown. The parallel acoustic hybrid filter 130 and the second filter 144 can be coupled at a common node, such as the antenna node ANT shown. The second filter 144 can be a hybrid acoustic passive filter, a non-acoustic LC filter, or an acoustic wave filter. The second filter 144 can be a bandstop filter. A stopband of the bandstop filter can include part or all of the first passband of the first bandpass filter 132 and / or the second passband of the second bandpass filter 134.

[0144] Fig. Figure 15 is a schematic block diagram of a triplexer 150, which includes a hybrid parallel bandpass filter 130 according to one embodiment. The triplexer 150 includes a hybrid parallel bandpass filter 130, a second filter 154, and a third filter 156. The parallel hybrid acoustic filter 130 can be a high-band filter, the second filter 154 can be a mid-band filter, and the third filter 156 can be a low-band filter, as shown. The parallel acoustic hybrid filter 130, the second filter 154, and the third filter 156 can be coupled at a common node, such as the antenna node shown. The second filter 154 can be a high-pass and band-stop filter. A blocking band of the high-pass and band-stop filter can include part or all of the first passband of the first band-pass filter 132 and / or the second passband of the second band-pass filter 134.The second filter 154 can be a hybrid acoustic LC filter, a non-acoustic LC filter, or an acoustic wave filter. The third filter 156 can be a low-pass filter. The third filter 156 can be a hybrid acoustic LC filter, a non-acoustic LC filter, or an acoustic wave filter. The third filter 156 can pass frequencies below the respective passbands of the second filter 154 and the hybrid parallel bandpass filter 130.

[0145] Fig. Figure 16 is a schematic block diagram of a triplexer 160, which includes a common high-pass filter 162 and a hybrid parallel band-pass filter 130 according to one embodiment. The triplexer 160 is, like the triplexer 150, made of Fig. 15, except that a common high-pass filter 162 is cascaded with both the hybrid parallel band-pass filter 130 and the second filter 144, and the second filter 144 is a band-stop filter. Accordingly, the common high-pass filter 162 is coupled between the parallel acoustic hybrid filter 130 and the common node. The common high-pass filter 162 is also coupled between the second filter 144 and the common node. The common high-pass filter 162 can, for example, be an LC filter or a hybrid acoustic LC filter. In one embodiment, the common high-pass filter 162 can be a non-acoustic passive filter. Such a common, i.e., jointly used, high-pass filter 162 together with the parallel hybrid acoustic filter 130 can achieve a relatively wide bandwidth and relatively strong attenuation for a high-band path.

[0146] Fig. Figure 17 is a schematic block diagram of a quadplexer 170, which includes a common high-pass filter 162 and a hybrid band-pass filter according to one embodiment. The quadplexer 170 is, like the triplexer 160, made of Fig. 16, except that the first bandpass filter 132 and the second bandpass filter 134 have separate connections. This can offer more freedom in carrier aggregation. In the quadplexer 170, the first bandpass filter 132 and the second bandpass filter 134 can receive signals within different frequency bands and filter the corresponding signals.

[0147] Fig. Figure 17 is an example of a multiplexer that incorporates a hybrid acoustic passive filter. The first bandpass filter 132 and the second bandpass filter 134 have different passbands and are both connected via the common highpass filter 162 to a common node (the antenna node ANT in Figure 17). Fig. 17) coupled. The first bandpass filter 132 and / or the second bandpass filter 134 can include acoustic resonators and a non-acoustic passive component. The non-acoustic passive component can include an inductor and a capacitor outside a bare chip containing the acoustic wave resonators. The non-acoustic passive component can include an inductor in parallel with an acoustic resonator of the acoustic resonators. The first bandpass filter 132 and / or the second bandpass filter 134 can include any suitable combination of features of the hybrid acoustic passive filters disclosed herein. In certain embodiments, the first bandpass filter 132 and the second bandpass filter 134 each have a passband in a frequency range from 2 gigahertz to 5 gigahertz, such as passbands in a frequency range from 2 gigahertz to 3 gigahertz.

[0148] The bandstop filter 144 is coupled to the common node via the common high-pass filter 162. The bandstop filter 144 includes a stopband that incorporates the passbands of the first band-pass filter 132 and the second band-pass filter 134. The low-pass filter 156 is coupled to the common node.

[0149] The Quadplexer 170 allows for a specific operating behavior of a carrier aggregation compared to the Triplexer 160. Fig. 16. This can be improved. For example, a wireless communication device incorporating the quadplexer can support carrier aggregation at a common node, involving a first carrier and a second carrier. In this example, the first carrier can be within a passband of the first bandpass filter 132 and outside the passband of the second bandpass filter 134, and the second carrier can be outside the passbands of the first and second bandpass filters 132 and 134. If the first carrier is not filtered by the second bandpass filter 134, there can be less insertion loss in the quadplexer 170 compared to the triplexer 160.

[0150] Fig. Figure 18 is a schematic diagram of a triplexer 180, which includes a hybrid parallel bandpass filter 182 according to one embodiment. Fig. Figure 18 shows an exemplary multiplexer with a hybrid parallel bandpass filter. As shown, the triplexer 180 includes the hybrid parallel bandpass filter 182, a hybrid acoustic LC filter 184, a non-acoustic LC filter 186, and a harmonic notch filter 188.

[0151] The hybrid parallel bandpass filter 182 is an example of the hybrid parallel bandpass filter 130. The hybrid parallel bandpass filter 182 is a high-bandwidth filter in the triplexer 180. The hybrid parallel bandpass filter 182 is an exemplary filter topology of acoustic wave resonators and inductors. As shown, a high-bandwidth signal is fed to the hybrid parallel bandpass filter 182 via the inductors L1801 and L1802. The hybrid parallel bandpass filter 182 includes a first subfilter, which incorporates acoustic resonators A1801, A1802, A1803, A1804, A1805, A1806, A1807, A1808, A1809, and A1810, as well as inductors L1803, L1804, and L1805. The hybrid parallel bandpass filter 182 also includes a second subfilter, which includes the acoustic resonators A1811, A1812, A1813, A1814, A1815, A1816, A1817, A1818, A1819 and A1820, as well as the inductors L1806 and L1807.The hybrid parallel bandpass circuit 182 includes parasitic capacitances that are in . Fig. Figure 18 is not shown, although these parasitic capacitances are part of an LC circuit of the parallel hybrid bandpass filter 182. Inductances of the hybrid parallel bandpass filter 182 can include one or more SMT inductors and / or one or more conductive traces or tracks of a substrate. Acoustic resonators of the hybrid parallel bandpass filter 182 can include one or more BAW resonators, such as one or more FBARs.

[0152] The hybrid acoustic LC filter 184 includes acoustic resonators, inductors, and capacitors. As shown, the hybrid acoustic LC filter 184 includes the acoustic resonators A1821, A1822, A1823, A1824, A1825, A1826, A1827, A1828, and A1829; inductors L1808, L1809, L1810, L1811, and L1812; and capacitors C1801 and C1802. The hybrid acoustic LC filter 184 can be used in accordance with all suitable principles and advantages of the hybrid acoustic LC filters disclosed herein. The hybrid acoustic LC filter 184 is a mid-band filter in the triplexer 180.

[0153] The non-acoustic LC filter 186 is a low-band filter in the triplexer 180. The non-acoustic LC filter 186 can be a low-pass filter. Such a low-pass filter can be designed according to all suitable principles and advantages, for example, the low-pass filter of the Fig. 24A and / or 24B will be implemented.

[0154] The harmonic notch filter 188 can provide notches at the harmonics of a high-frequency signal in order to filter out these harmonics. The harmonic notch filter 188 can be designed according to all the suitable principles and advantages of low-pass filters, for example. Fig. 24D can be implemented. The harmonic notch filter 188 shown includes capacitors C1803, C1804, C1805 and C1806 as well as inductors L1813 and L1814. The harmonic notch filter 188 can provide notches at two harmonic frequencies.

[0155] Fig. Figure 19A illustrates simulation results of the Triplexer 180 from Fig. 18. Fig. Figure 19A illustrates the passbands of filters 182, 184, and 186 of the Triplexer 180. The low-pass filter 186 has a passband indicated by a solid curve. The mid-band filter 184 has a passband indicated by a first dashed curve. The parallel hybrid acoustic bandpass filter 182 has passbands indicated by different dashed curves. The parallel hybrid acoustic bandpass filter 182 has a notch in the middle part of its passband. This notch can correspond to a frequency range between two different frequency bands that the parallel hybrid acoustic bandpass filter 182 can pass. The simulation results indicate that the isolation of the mid- and high-band filters in the Triplexer 180 has been improved compared to previous designs. In simulations of the Triplexer 180 from Fig. With a 9:1 articulated 18, there is an adequate insertion loss.

[0156] Fig. Figure 19B illustrates diagrams of simulation results of the Triplexer 180 from Fig. 18 compared to a previous design. These simulation results indicate that both insertion loss and isolation have been improved with the Triplexer 180 compared to the previous design.

[0157] Although the embodiments of parallel acoustic hybrid filters presented here relate to bandpass filters, all suitable principles and advantages of the parallel acoustic hybrid filters presented here can be applied to bandstop filters. A parallel acoustic hybrid bandstop filter can be implemented as a standalone filter or in a multiplexer. An example of a parallel acoustic hybrid bandstop filter is given by the Fig. 20, Fig. 21 to Fig. 22 discussed.

[0158] Fig. Figure 20 is a schematic block diagram of a hybrid parallel bandstop filter 200 according to one embodiment. The hybrid parallel bandstop filter 200 can produce relatively broadband suppression in close proximity to a passband of another filter without using an LC notch filter, which can significantly reduce in-band loss.

[0159] The parallel hybrid bandstop filter 200 comprises a first bandstop filter 202 and a second bandstop filter 204 arranged in parallel to each other. The first bandstop filter 202 and the second bandstop filter 204 are arranged for filtering high-frequency signals. The first bandstop filter 202 is a hybrid acoustic passive filter comprising a first acoustic resonator and a first non-acoustic passive component. The first non-acoustic passive component may include at least one inductor and one capacitor. The second bandstop filter 204 is a hybrid acoustic passive filter comprising a second acoustic resonator and a second non-acoustic passive component. The second non-acoustic passive component may include at least one inductor and one capacitor. The first bandstop filter 202 has a first stopband, i.e.,The first bandstop filter has a first bandstop band, and the second bandstop filter 204 has a second bandstop band. By connecting two filters in parallel, the bandstop band of the parallel hybrid bandstop filter 200 can be increased compared to one of the individual filters 202 or 204 contained in the parallel filter.

[0160] The hybrid parallel band-stop filter 200 has a stopband that includes the first stopband and the stopband. The frequency response of the hybrid parallel band-stop filter 200 may exhibit a notch in its stopband between the first and second stopbands. A symbol 305 for the parallel hybrid bandpass filter 205 is shown in Fig. 20 also shown.

[0161] Fig. Figure 21 is a schematic diagram of a hybrid parallel bandstop filter 210 according to one embodiment. The hybrid parallel bandstop filter 210 is an example of the hybrid parallel bandstop filter 200 from [reference missing]. Fig. 20. The hybrid parallel bandstop filter 210 is an exemplary filter topology of acoustic wave resonators and inductors. The hybrid parallel bandstop filter 210 includes parasitic capacitances that are in Fig. 21 are not shown, although these parasitic capacitances are part of an LC circuit of the hybrid parallel bandstop filter 210.

[0162] As shown, a high-frequency signal can be fed to the hybrid parallel band-stop filter 210 via the inductors L2101 and L2102. The hybrid parallel band-stop filter 210 includes a first sub-filter 212, which contains the acoustic resonators A2101, A2102, A2103, A2104, and A2105, as well as the inductors L2103, L2104, L2105, L2106, and L2107. The hybrid parallel band-stop filter 210 also includes a second sub-filter 214, which contains the acoustic resonators A216, A217, A218, A219, and A220, the inductors L2108, L2109, and L2110, as well as the capacitor C2101. The inductors of the hybrid parallel bandstop filter 210 can include one or more SMT inductors and / or one or more conductive traces of a substrate. The acoustic resonators of the hybrid parallel bandstop filter 210 can include one or more BAW resonators, such as one or more FBARs.

[0163] Fig. Figure 22 is a diagram of the frequency response of the hybrid parallel bandstop filter 210. Fig. 21. The frequency response in Fig. Figure 22 shows that a relatively wide bandstop filter can be achieved with the parallel hybrid acoustic bandstop filter 210. Hybrid acoustic LC filter with harmonic suppression

[0164] As 5G mobile technology evolves, new carrier aggregation (CA) standards may require stricter intermodulation distortion (IMD) suppression for filters. To achieve CA-compliant IMD-compliant filters with strong suppression at frequencies near the passband, acoustically enhanced filters using hybrid resonators, such as hybrid acoustic LC resonators, can be designed to provide a relatively low-loss, wide passband while also exhibiting relatively strong suppression at frequencies near the passband. Acoustic resonators, when subjected to relatively high power, can generate harmonics. These harmonics, generated by either a surface acoustic wave (SAW) or volume acoustic wave (VOW) device, may escape into a higher frequency band and / or exhibit emission exceeding a standard specification.

[0165] Since acoustic resonator filters can generate harmonics with relatively high power, a passive non-acoustic filter can be cascaded with a hybrid acoustic LC filter to achieve both hybrid acoustic LC filter suppression and resonator-generated harmonic suppression. Accordingly, a non-acoustic LC filter, such as a filter of an integrated passive device (IPD), can be cascaded with a hybrid acoustic LC filter to achieve a relatively wide bandwidth and relatively high suppression while simultaneously suppressing self-generated harmonics.

[0166] The hybrid acoustic LC filters and / or multiplexers discussed here may include a harmonic suppression filter to attenuate one or more harmonic frequencies. This harmonic suppression filter may be a low-pass filter and / or a notch filter. Disclosed harmonic suppression filters may also include non-acoustic filters. For example, the harmonic suppression filter may be an IPD filter. The harmonic suppression filter is cascaded with the hybrid acoustic LC filter. These cascaded filters can be coupled between a power amplifier and an antenna connection. For example, the harmonic suppression filter can be coupled between an antenna connection and the hybrid acoustic LC filter.

[0167] Aspects of this revelation relate to a hybrid acoustic LC filter with harmonic suppression. The hybrid acoustic LC comprises a hybrid passive / acoustic filter configured to filter a high-frequency signal and a non-acoustic LC filter configured to suppress a harmonic of the high-frequency signal. The hybrid passive / acoustic filter includes acoustic resonators and a non-acoustic passive component. The non-acoustic LC filter is cascaded with the hybrid passive / acoustic filter.

[0168] The non-acoustic LC filter can be a notch filter. The frequency response of the notch filter can exhibit a notch corresponding to a second harmonic of the high-frequency signal. The frequency response of the notch filter can also exhibit a notch corresponding to a third harmonic of the high-frequency signal. The non-acoustic LC filter can be a low-pass filter. The non-acoustic LC filter can incorporate integrated passive devices on a raw chip for an integrated passive device.

[0169] The hybrid passive / acoustic filter can be implemented in accordance with all suitable principles and advantages of any of the hybrid resonators disclosed herein. For example, the hybrid passive / acoustic filter can be implemented as the hybrid resonator of Fig. 11A and / or the hybrid resonator of Fig. 12 include. The acoustic resonators may include acoustic volume wave resonators.

[0170] Hybrid acoustic LC filters with harmonic suppression can be used in a variety of applications, such as standalone filters, multiplexers containing multiple filters for filtering high-frequency signals, and wireless communication devices like mobile phones. Hybrid acoustic LC filters with harmonic suppression can be implemented in power amplifier modules, diversity receiver modules, or other suitable high-frequency front-end modules.

[0171] Fig. Figure 23A is a schematic block diagram of the high-frequency system, which includes a filter 230, which in turn includes a hybrid acoustic LC filter 232, cascaded with a low-pass filter 234 according to one embodiment. The high-frequency system also includes a power amplifier 231 and an antenna 234. As shown, the hybrid acoustic LC filter 232 can receive the high-frequency signal from the power amplifier 231. The high-frequency signal from the power amplifier 231 can have a relatively high power. The acoustic resonators of the hybrid acoustic LC filter 232 can generate one or more harmonics. The low-pass filter 234 can filter out such harmonics. Accordingly, the filter 230 is a hybrid acoustic LC filter with harmonic suppression. As shown, the low-pass filter 234 is coupled between an output of the hybrid acoustic LC filter 232 and the antenna 234.The antenna 234 can transmit a filtered version of the high-frequency signal provided by the power amplifier 231.

[0172] The hybrid acoustic LC filter 232 can include acoustic resonators and non-acoustic passive components. The acoustic resonators can include one or more acoustic volume wave resonators such as FBARs, one or more SAW resonators, one or more boundary wave resonators, one or more Lamb wave resonators, or the like, or a suitable combination thereof. The hybrid acoustic LC filter 232 can include an LC circuit comprising one or more inductors and one or more capacitors. The one or more capacitors can include one or more IPD capacitors, one or more surface capacitors, one or more parasitic capacitors, or the like, or a suitable combination thereof. The one or more inductors, i.e.,Inductors can include one or more IPD inductors, one or more surface-mounted conductors, one or more inductors implemented as a conductive track of a packaging substrate, the like, or a suitable combination thereof. The hybrid acoustic LC filter 232 can be implemented in accordance with all suitable principles and advantages of the hybrid acoustic LC filters disclosed herein. In some cases, the hybrid acoustic LC filter 232 can incorporate a hybrid resonator 110. Fig. 11A. The hybrid acoustic LC filter 232 can, in certain applications, incorporate a hybrid conductor structure 120. Fig. 12 are included.

[0173] In certain applications, the hybrid acoustic LC filter 232 can have a passband from 3.3 GHz to 4.2 GHz. According to some other applications, the hybrid acoustic LC filter 232 can have a passband from 4.4 GHz to 5 GHz. The hybrid acoustic LC filter 232 can provide suppression for (a) a carrier aggregation transmission blocker and (b) an out-of-band continuous wave blocker in various embodiments.

[0174] The low-pass filter 234 can pass signals below a cutoff frequency and suppress signals above a cutoff frequency. Accordingly, the cutoff frequency of the low-pass filter 234 can be selected such that the high-frequency signal of the acoustic hybrid LC filter 232 is passed through while one or more harmonics of the high-frequency signal are suppressed. For example, the cutoff frequency could be set to a frequency that is above the frequency of the high-frequency signal and below the second harmonic of the high-frequency signal. In certain embodiments, the hybrid acoustic LC filter 232 is a band-pass filter, and the cutoff frequency of the low-pass filter 234 lies above the passband of the band-pass filter and below a second harmonic of the high-frequency signal passed through by the band-pass filter.

[0175] The low-pass filter 234 can be a non-acoustic LC filter. The low-pass filter 234 can include one or more capacitors and one or more inductors. The low-pass filter 234 can include one or more IPDs, one or more surface-mounted passive components, one or more passive components of a packaging substrate, such as one or more inductive traces on the packaging substrate, or similar, or any suitable combination thereof. Exemplary circuit topologies for the low-pass filter 232 are shown using the Fig. 24A and Fig. 24B discussed.

[0176] Fig. Figure 23B is a schematic block diagram of a high-frequency system comprising a filter 235, which includes a hybrid acoustic LC filter 232, cascaded with a harmonic notch filter 236, according to one embodiment. The high-frequency system of Fig. 23B is like the high-frequency system of Fig. 23A, except that the filter 230 from Fig. 23A through filter 234 in Fig. 23B is replaced. Filter 235 is like filter 230 from Fig. 23A, except that instead of the low-pass filter 234, the filter 230 is used. Fig. 23A incorporates a harmonic notch filter 236. As shown, the harmonic notch filter 236 is coupled between an output of the hybrid acoustic LC filter 232 and the antenna 234.

[0177] The harmonic notch filter 236 can have one or more notches in its frequency response to filter out one or more corresponding harmonics of a high-frequency signal from the hybrid acoustic LC filter 232. The second harmonic, generated by acoustic resonators of the hybrid acoustic LC filter 232, can be the strongest harmonic. Accordingly, the harmonic notch filter 236 can be a second harmonic notch filter, having a notch in its frequency response at a second harmonic. The harmonic notch filter 236 can have a notch at one or more other harmonics. In certain embodiments, a harmonic notch filter cascaded with the hybrid acoustic LC filter 232 can have two or more notches at each suitable harmonic. For example, a harmonic notch filter can have notches at a second and a third harmonic.By notching a harmonic of a high-frequency signal provided by the hybrid acoustic LC filter 232, the harmonic notch filter 236 can suppress the harmonic generated by acoustic resonators of the hybrid acoustic LC filter 232.

[0178] The harmonic notch filter 236 can be a non-acoustic LC filter comprising one or more capacitors and one or more inductors. The harmonic notch filter 236 can also include one or more IPDs, one or more surface-mounted passive components, one or more passive components of a packaging substrate, such as one or more inductive traces on the packaging substrate, or similar, or a suitable combination thereof. Exemplary circuit topologies for the harmonic notch filter 236 and / or other suitable harmonic notch filters are described below. Fig. 24C and Fig. 24D discussed.

[0179] Fig. Figure 24A is a schematic diagram of an exemplary low-pass filter 240. The low-pass filter 240 is an example of the low-pass filter 234 in Fig. 23A. The low-pass filter 240 comprises a series inductor L1 and a shunt capacitor C1, arranged to filter out frequencies above a cutoff frequency. The inductance of the series inductor L1 and the capacitance of the shunt capacitor C1 together determine the cutoff frequency of the low-pass filter 240.

[0180] Fig. Figure 24B is a schematic diagram of another example of the low-pass filter 242. The low-pass filter 242 is an example of the low-pass filter 234 in Fig. 23A. The low-pass filter 242 includes series inductors L1 to LN and shunt capacitors C1 to CN. The inductances of the series inductors L1 to LN and the capacitances of the shunt capacitors C1 to CN together set the cutoff frequency in the low-pass filter 242.

[0181] Fig. Figure 24C is a schematic diagram of an exemplary harmonic notch filter 243. The harmonic notch filter 243 is an example of the harmonic notch filter 236 in Fig. 23B. The harmonic notch filter 243 incorporates a shunt series LC circuit. The inductor Ls and a capacitor C1 of the shunt series LC circuit can adjust the notch frequency. Different impedances of the inductor Ls and the capacitor C1 can together produce a notch at different frequencies. The notch can be provided at any suitable harmonic frequency. For example, the notch can be tuned to a second harmonic of a high-frequency signal fed to the harmonic notch filter 243. As another example, the notch can be tuned to a third harmonic of a high-frequency signal fed to the harmonic notch filter 243.

[0182] Fig. Figure 24D is a schematic diagram of an exemplary harmonic notch filter 244. The harmonic notch filter 244 is an example of the harmonic notch filter 236 in Fig. 23B. The harmonic notch filter 244 comprises two series-shunt LC circuits. A first series-shunt LC circuit includes capacitor C1 and inductor Ls1. A second series-shunt LC circuit includes capacitor C2 and inductor Ls2. The two series-shunt LC circuits can provide notches at different harmonics, such as a second and a third harmonic. Accordingly, the harmonic notch filter 244 shown can provide notches at two different harmonics. The impedances of the individual series-shunt LCs can set a corresponding frequency for each notch. Other harmonic notch filters can provide notches at three or more harmonics.

[0183] Fig. Figure 24E is a schematic diagram of an exemplary harmonic notch and low-pass filter 245. The harmonic notch and low-pass filter 245 can provide a low-pass filter that also includes a notch in the frequency response at a harmonic. A series shunt LC circuit can provide the harmonic notch. The series shunt LC circuit includes capacitor C1 and inductor Ls. A series inductor L1 together with a shunt capacitor C2 can provide low-pass filter characteristics.

[0184] The hybrid acoustic LC filters with harmonic suppression discussed here can be implemented in multiplexers that include a variety of high-frequency filters coupled at a common node. Examples of multiplexers are diplexers, triplexers, quadplexers, etc. Any number of filters can be coupled at a common node in a multiplexer. A variety of filters can be coupled together at a common node by a multi-way high-frequency switch to implement switch-plexing functionality. Some examples of multiplexers that include a hybrid acoustic LC filter with harmonic suppression are given with reference to the Fig. Sections 25A to 25B are described. While the multiplexers in these exemplary embodiments are triplexers, the principles and advantages associated with such embodiments can be applied to all other suitable multiplexers. Other suitable multiplexers include diplexers, quadplexers, etc.

[0185] Fig. Figure 25A is a schematic block diagram of a triplexer 250, which includes a hybrid acoustic LC filter 232 cascaded with a low-pass filter 234 according to one embodiment. The triplexer 250 includes the filter 230 from Fig. 23A, a high-band filter 252, and a low-band filter 254. The filter 230, the high-band filter 252, and the low-band filter 254 are coupled at a common node, which is an antenna node in the triplexer 250. The filter 230 is a mid-band filter in the triplexer 250. The high-band filter 252 can be a bandpass filter or a high-pass filter. The high-band filter 252 is arranged for filtering high-frequency signals. The high-band filter 252 can be a hybrid acoustic LC filter implemented according to the suitable principles and advantages described herein. As an example, the high-band filter can include parallel acoustic passive hybrid filters. In some other embodiments, the high-band filter 252 can be implemented by any other suitable circuit elements, such as non-acoustic LC circuit elements. The low-band filter 254 can be a low-pass filter or a band-pass filter.The low-band filter 254 is designed to filter low-frequency high-frequency signals. The low-band filter 254 can be a hybrid acoustic LC filter implemented according to the suitable principles and advantages described herein. In some other embodiments, the low-band filter 254 can be implemented by any other suitable circuit elements, such as non-acoustic LC circuit elements.

[0186] Fig. Figure 25B is a schematic block diagram of a triplexer 255, which includes a hybrid acoustic LC filter 232 cascaded with a harmonic notch filter 236 according to one embodiment. The triplexer 255 is, like the triplexer 250, made of Fig. 25A, except that filter 235 is installed instead of filter 230. Filter 235 includes a harmonic notch filter 236 arranged to suppress a harmonic in the high-frequency signal of the hybrid acoustic LC filter 232. The harmonic notch filter 236 can provide notches for two or more harmonics in some applications. In certain embodiments, a multiplexer filter can include a hybrid acoustic LC filter cascaded with a low-pass filter and a harmonic notch filter. High-frequency modules

[0187] The filters disclosed here can be implemented in a variety of bundled modules. Some exemplary packaged modules are now disclosed, in which all suitable principles and advantages of the filters and / or multiplexers disclosed here can be implemented. The exemplary packaged modules can include a housing or packaging that encloses the illustrated circuit elements. A module that includes a high-frequency component can be referred to as a high-frequency module. The illustrated circuit elements can be arranged on a common packaging substrate. The packaging substrate can, for example, be a laminate substrate. Fig. 26, Fig. 27 to Fig. Figure 28 are schematic block diagrams of illustrated packaged modules according to specific embodiments. Any suitable combination of features of these bundled modules can be implemented together. While filters are present in the exemplary packaged modules of the Fig. 26, Fig. 27 to Fig. As shown in Figure 28, each of these filters can be implemented in a suitable multiplexer.

[0188] Fig. Figure 26 is a schematic diagram of a high-frequency module 260 with a transmit path that includes a filter 262 according to one embodiment. The illustrated module 260 includes the filter 262, a power amplifier 263, and a high-frequency switch 264. The high-frequency module that includes a power amplifier can be referred to as a power amplifier module. The power amplifier 263 can amplify a high-frequency signal. The high-frequency switch 264 can be a multi-way high-frequency switch. The high-frequency switch 264 can electrically couple an output of the power amplifier 263 to the filter 262. The filter 262 is a transmit filter arranged for filtering a transmitted high-frequency signal. The filter 262 can include any suitable combination of features of the filters disclosed herein.In some other cases, a high-frequency switch can selectively connect a transmit signal path electrically to an input of the power amplifier 263.

[0189] Fig. Figure 27 is a schematic diagram of a high-frequency module 270 with a receive path that includes a filter 272 according to one embodiment. The illustrated module 270 includes the filter 272, a low-noise amplifier 274, and a high-frequency switch 274. The filter 272 is a receive filter arranged to filter a received high-frequency signal. The filter 272 can include any suitable combination of features of the filters disclosed herein. The low-noise amplifier 274 can amplify filtered received high-frequency signals provided by the filter 272. The high-frequency switch 274 can electrically couple an output of the low-noise amplifier 274 to a receive path. In certain embodiments, the high-frequency switch 276 can be a multi-path high-frequency switch arranged to selectively couple the output of the low-noise amplifier 274 electrically to one or more selected receive paths.In such embodiments, a high-frequency divider (not shown) can be coupled between the low-noise amplifier 274 and the high-frequency switch 276.

[0190] Fig. Figure 28 is a schematic diagram of a high-frequency module 280, which includes a filter 282 according to one embodiment. The illustrated module 280 includes one or more filters 282, a high-frequency switch 284, a power amplifier 263, and a low-noise amplifier 274. The one or more filters 282 can include any suitable combination of features of the filters disclosed herein. The high-frequency switch 284 can electrically couple the one or more filters 282 to the power amplifier 263 and / or the low-noise amplifier 274. Wireless communication devices

[0191] The filters described here can filter high-frequency signals in a wireless communication device. An example of a wireless communication device is given with reference to the Fig. 29 and Fig. 30 explained.

[0192] Fig. Figure 29 is a schematic diagram of a wireless communication device 290, which includes a filter 293 in a high-frequency front-end 292 according to one embodiment. The wireless communication device 290 can be any suitable wireless communication device. For example, a wireless communication device 290 can be a mobile phone, such as a smartphone. As shown, the wireless communication device 290 includes an antenna 291, an RF front-end 292 which includes a filter 293, a transmitter-receiver 294, a processor 295, a memory 296, and a user interface 297. The antenna 291 can transmit RF signals provided by the RF front-end 292. Such RF signals can include carrier aggregation signals. The antenna 291 can provide received RF signals to the RF front-end 292 for processing. Such RF signals can include carrier aggregation signals.

[0193] The RF front end 292 can include one or more power amplifiers, one or more low-noise amplifiers, RF switches, receive filters, transmit filters, duplex filters, multiplexers, frequency-division multiplexing circuits, or any combination thereof. The RF front end 292 can transmit and receive RF signals associated with all suitable communication standards. The filter 293 can be implemented according to any suitable principles and advantages of the filters described herein. For example, the filter 293 can implement any suitable combination of features that, with respect to any of the Fig. Sections 1 to 25B are described. Two or more filters of the RF-Front 292 can be implemented in accordance with the suitable principles and advantages disclosed herein.

[0194] The transmitter-receiver 294 can supply RF signals to the RF front-end 292 for amplification and / or other processing. The transmitter-receiver 294 can also process an RF signal provided by a low-noise amplifier of the RF front-end 292. The transmitter-receiver 294 is connected to the processor 295. The processor 295 can be a baseband processor. The processor 295 can provide all suitable baseband processing functions for the wireless communication device 290. The processor 295 can access the memory 296. The memory 296 can store all suitable data for the wireless communication device 290. The processor 295 is also in communication with the user interface 297. The user interface 297 can be any suitable user interface, such as a display.

[0195] Fig. Figure 30 is a schematic diagram of a wireless communication device 300, which includes a filter 293 in a high-frequency front end 292 and a second filter 303 in a diversity receiver module 302 according to one embodiment. The wireless communication device 300 is similar to the wireless communication device 290 in Fig. 29, except that the wireless communication device 300 also includes diversity reception features. As in Fig. As shown in Figure 30, the wireless communication device 300 includes a diversity antenna 301, a diversity module 302 configured to process signals received from the diversity antenna 301 and including a filter 303, and a transmitter-receiver 304 that communicates with both the high-frequency front end 292 and the diversity-receiver module 302. The filter 303 can be used in accordance with all suitable principles and advantages of the filters described herein. For example, the filter 303 can implement any suitable combination of features that are advantageous with respect to any of the Fig. 1 to 25B are described. Two or more filters of the Diversity Receiver Module 302 can be used in accordance with the appropriate principles and advantages disclosed herein. conclusion

[0196] Each of the principles and advantages described herein can be applied to other suitable systems, modules, chips, filter assemblies, filters, wireless communication devices, and methods, not only to those described above. The elements and operations of the various embodiments described above can be combined to form further embodiments. Each of the principles and advantages described herein can be implemented in conjunction with radio frequency circuits configured to process signals with a frequency in the range of approximately 30 kHz to 300 GHz, such as a frequency in the range of approximately 450 MHz to 8.5 GHz.

[0197] Aspects of this disclosure can be implemented in various electronic devices. Examples of electronic devices include, but are not limited to, consumer electronics products, components of consumer electronics products such as chips and / or packaged radio frequency modules, electronic test equipment, wireless uplink communication devices, personal network communication devices, and so on. Examples of consumer electronics products include a mobile phone such as a smartphone, a portable computing device such as a smartwatch or earphone, a telephone, a television, a computer monitor, a computer, a router, a modem, a handheld computer, a laptop, a tablet computer, a personal digital assistant (PDA), a vehicle electronics system such as an automotive electronics system, a microwave oven, a refrigerator, a stereo system, a digital music player, a camera such as a digital camera, a portable memory chip, a household appliance, and so on.Furthermore, the electronic devices may also include unfinished products.

Claims

[1] Parallel acoustic hybrid passive filter (130; 182; 200), comprising: a first subfilter (132; 202) with at least one first shunt circuit and a second shunt circuit coupled in parallel to the first shunt circuit, the first shunt circuit having at least one first acoustic shunt resonator in series with a first shunt inductor and the second shunt circuit having only one second shunt inductor coupled in parallel to the first acoustic shunt resonator and the first shunt inductor; and a second subfilter (134; 204) coupled in parallel to the first subfilter (132; 202) to a common input node and a common output node, comprising a third shunt circuit, a fourth shunt circuit coupled in parallel to the third shunt circuit, and at least one capacitor coupled in parallel to the third and fourth shunt circuits, of which the third shunt circuit has at least one second acoustic shunt resonator in series with a third shunt inductor, and the fourth shunt circuit has only one fourth shunt inductor coupled in parallel to the second acoustic shunt resonator and the third shunt inductor; a first series inductor (L1801; L2101) connected to the common input node such that the first series inductor (L1801; L2101) is connected in series with the first subfilter (132; 202) and the second subfilter (134; 204); and a fifth shunt inductor (L1802; L2102) connected to the common input node, and a sixth shunt inductor (L1813; L211) connected to the common output node; wherein the first subfilter (132; 202) and the second subfilter (134; 204) together are designed to filter a high-frequency signal. [2] Parallel acoustic hybrid passive filter (130; 182) according to claim 1, wherein the first subfilter (132) and the second subfilter (134) are arranged together as a bandpass filter with a passband. [3] Parallel acoustic hybrid passive filter (130; 182) according to claim 1 or 2, wherein a frequency response of the parallel acoustic hybrid passive filter has a first sub-passband corresponding to the first sub-filter (132), a second sub-passband corresponding to the second sub-filter (134), and a notch at a notch frequency between the first sub-passband and a second sub-passband. [4] Parallel acoustic hybrid passive filter (200) according to claim 1 wherein the first subfilter (202) and the second subfilter (204) are arranged together as a bandstop filter with a stopband. [5] Parallel acoustic hybrid passive filter (130; 182; 200) according to any one of claims 1 to 4, wherein the first subfilter (132; 202) includes acoustic volume wave resonators which include the first acoustic shunt resonator. [6] Parallel acoustic hybrid passive filter (130; 182; 200) according to any one of claims 1 to 5, wherein the first subfilter (132; 202) further comprises an acoustic series resonator which is connected in series with the first acoustic shunt resonator and in parallel with an inductor. [7] Parallel acoustic hybrid passive filter (130; 182; 200) according to any one of claims 1 to 6, wherein the first subfilter (132; 202) further comprises a third acoustic shunt resonator. [8] Parallel acoustic hybrid passive filter (130; 182; 200) according to any one of claims 1 to 7, wherein the second shunt inductance is part of an integrated passive device. [9] Parallel acoustic hybrid passive filter (130; 182) according to any one of claims 1 to 8, wherein the first subfilter (132; 202) and the second subfilter (134; 204) have different passbands. [10] Parallel acoustic hybrid passive filter (130; 182) according to any one of claims 1 to 9, wherein a lower limit of a passband of the parallel acoustic hybrid passive filter (130; 182) is at least 2 gigahertz. [11] Multiplexer (140; 150; 160; 170; 180) with a parallel acoustic hybrid passive filter, comprising: a first filter (130; 182; 200) comprising a first subfilter (132; 202) with at least one first shunt circuit and a second shunt circuit coupled in parallel to the first shunt circuit, of which the first shunt circuit has at least one first acoustic shunt resonator in series with a first shunt inductance and the second shunt circuit has only one second shunt inductance coupled in parallel to the first acoustic shunt resonator and the first shunt inductance, and a second subfilter (134; 204) connected in parallel to the first subfilter (132;202) is coupled to a common input node and a common output node, comprising a third shunt circuit, a fourth shunt circuit coupled in parallel to the third shunt circuit and at least one capacitor coupled in parallel to the third and fourth shunt circuits, of which the third shunt circuit has at least one second acoustic shunt resonator in series with a third shunt inductor and the fourth shunt circuit has only one fourth shunt inductor coupled in parallel to the second acoustic shunt resonator and the third shunt inductor; a first series inductor (L1801; L2101) connected to the common input node such that the first series inductor (L1801; L2101) is connected in series with the first subfilter (132; 202) and the second subfilter (134; 204); and a fifth shunt inductor (L1802; L2102) connected to the common input node, and a sixth shunt inductor (L1813; L211) connected to the common output node; and a second filter (144; 154; 156; 186) that is coupled to the common input node and the common output node. [12] Multiplexer (140; 150; 160; 170; 180) according to claim 11, wherein the first filter (130; 182) is a bandpass filter. [13] Multiplexer (140; 150; 160; 170; 180) according to claim 12, wherein a frequency response of the first filter (130; 182) has a first subpass band corresponding to the first subfilter (132), a second subpass band corresponding to the second subfilter (134) and a notch at a notch frequency between the first subpass band and a second subpass band. [14] Multiplexer (140; 160; 170; 180) according to claim 12 or 13, wherein the second filter (144) is a bandstop filter. [15] Multiplexer (140; 150; 160; 170; 180) according to any one of claims 11 to 14, wherein the first subfilter (132; 202) has an acoustic series resonator in series with the first acoustic shunt resonator and in parallel with an inductor. [16] Multiplexer (150; 170; 180) according to claim 15, wherein the second filter (154; 162) is a high-pass filter. [17] Multiplexer (140; 150; 160; 170; 180) according to any one of claims 11 to 16, wherein the second subfilter (134; 204) has a third acoustic shunt resonator. [18] Multiplexer (140; 150; 160; 170; 180) according to any one of claims 11 to 17, wherein the first filter (133) has a first passband, the second filter (144; 154; 156; 186) has a second passband, and the first passband has a lower limit which is at a higher frequency than an upper limit of the second passband. [19] Multiplexer (140; 150; 160; 170; 180) according to any one of claims 11 to 18, further comprising a third filter coupled to at least one of the common input node and the common output node. [20] Wireless communication device (290; 300), comprising: a high-frequency front end (292) with a filter (130; 182; 200) configured to filter a high-frequency signal, and comprising a first sub-filter (132; 202) with at least one first shunt circuit and a second shunt circuit coupled in parallel to the first shunt circuit, of which the first shunt circuit has at least one first acoustic shunt resonator in series with a first shunt inductor and the second shunt circuit has only one second shunt inductor coupled in parallel to the first acoustic shunt resonator and the first shunt inductor, and a second sub-filter (134; 204) connected in parallel to the first sub-filter (132;202) is coupled to a common input node and a common output node, comprising a third shunt circuit, a fourth shunt circuit coupled in parallel to the third shunt circuit and at least one capacitor coupled in parallel to the third and fourth shunt circuits, of which the third shunt circuit has at least one second acoustic shunt resonator in series with a third shunt inductor and the fourth shunt circuit has only one fourth shunt inductor coupled in parallel to the second acoustic shunt resonator and the third shunt inductor; a first series inductor (L1801; L2101) connected to the common input node such that the first series inductor (L1801; L2101) is connected in series with the first subfilter (132; 202) and the second subfilter (134; 204); and a fifth shunt inductor (L1802; L2102) connected to the common input node, and a sixth shunt inductor (L1813; L211) connected to the common output node; and an antenna (291) in conjunction with the high-frequency front end (292). [21] Multiplexer (150; 160; 170; 180) with a hybrid acoustic passive filter, comprising: a plurality of filters (140) configured to filter respective high-frequency signals, each having a different passband, and of which at least one first filter (132) has acoustic resonators and a non-acoustic passive component; a common filter (162; 186) coupled between each of the plurality of filters (140) and a common node (ANT) and which has an LC component; and a high-frequency filter coupled to the common node (ANT) (154; 156). [22] Multiplexer (150; 160; 170; 180) according to claim 21, wherein the plurality of filters (140) includes the first filter (132), a second filter (134) and a third filter (144). [23] Multiplexer (150; 160; 170; 180) according to claim 22, wherein the first filter (132) is a first bandpass filter with a first passband, and the second filter (134) is a second bandpass filter with a second passband. [24] Multiplexer (150; 160; 170; 180) according to claim 23, wherein the third filter (144) is a bandstop filter with a barrier band that includes the first passband and the second passband. [25] Multiplexer (150; 160; 170) according to any one of claims 21 to 24, wherein the common filter (162) is a high-pass filter. [26] Multiplexer (150; 160; 170) according to claim 25, wherein the high-frequency filter (156) is a low-pass filter. [27] Multiplexer (180) according to one of claims 21 to 24, wherein the common filter (186) is a non-acoustic LC filter. [28] Multiplexer (150; 160; 170) according to any one of claims 21 to 26, wherein the common filter (162) has second acoustic resonators. [29] Multiplexer (150; 160; 170; 180) according to any one of claims 21 to 28, wherein the non-acoustic passive component includes an inductor arranged in parallel to a first acoustic resonator of the acoustic resonators. [30] Multiplexer (150; 160; 170; 180) according to any one of claims 21 to 29, wherein the acoustic resonators are formed on an acoustic resonator raw chip and the non-acoustic passive component includes an inductor outside the acoustic resonator raw chip and a capacitor outside the acoustic resonator raw chip. [31] Multiplexer (150; 160; 170; 180) according to any one of claims 21 to 30, wherein a second filter (134) of the plurality of filters (140) comprises second acoustic resonators and a second non-acoustic passive component. [32] Multiplexer (150; 160; 170; 180) according to claim 31, wherein the first filter (132) has a first passband and the second filter (134) has a second passband, and the first and second passbands are both in a frequency range of 2 gigahertz to 5 gigahertz. [33] Multiplexer (150; 160; 170; 180) according to claim 31, wherein the first filter (132) has a first passband and the second filter (134) has a second passband, and the first and second passbands are both in a frequency range of 2 gigahertz to 3 gigahertz. [34] Multiplexer (170) according to one of claims 21 to 33, wherein the multiplexer is arranged as a quadplexer. [35] Wireless communication device (290; 300), comprising: an antenna (291); and a multiplexer (293) in conjunction with the antenna (291), comprising a plurality of filters (140) configured to filter respective high-frequency signals, and comprising a first filter incorporating acoustic resonators and a non-acoustic passive component, a common filter coupled between each of the plurality of filters and a common node (ANT) and comprising an LC component, and a high-frequency filter coupled to the common node (ANT). [36] Wireless communication device (290; 300) according to claim 35, wherein a second filter (134) of the plurality of filters (140) includes second acoustic resonators and a second non-acoustic passive component. [37] Wireless communication device (290; 300) according to claim 36, wherein the wireless communication device (290; 300) is designed to support carrier aggregation at the common node with a first carrier located within a first passband of the first filter and a second carrier located outside the first passband and a second passband of the second filter. [38] Multiplexer (160; 170) with acoustic hybrid passive filters, comprising: a plurality of filters (140) comprising a first filter (132) comprising a first acoustic resonators and a first LC circuit, and a second filter (134) comprising a second acoustic resonators and a second LC circuit, with different high-frequency passbands; a common high-pass filter (162) coupled between each of the plurality of filters (140) and a common node (ANT); and a low-pass filter (156) coupled to the common node (ANT). [39] Multiplexer (160; 170) according to claim 38, wherein the plurality of filters (140) further includes a bandstop filter (144) with a barrier band comprising the passbands of the first and second filters. [40] Multiplexer (160; 170) according to claim 38 or 39, wherein the different high-frequency passbands are both within a frequency range between 2 gigahertz and 5 gigahertz.

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