EP2891244A1 - Multiplexeur à produits d'intermodulation réduits - Google Patents

Multiplexeur à produits d'intermodulation réduits

Info

Publication number
EP2891244A1
EP2891244A1 EP13742458.6A EP13742458A EP2891244A1 EP 2891244 A1 EP2891244 A1 EP 2891244A1 EP 13742458 A EP13742458 A EP 13742458A EP 2891244 A1 EP2891244 A1 EP 2891244A1
Authority
EP
European Patent Office
Prior art keywords
multiplexer
filter
mul
blocker
path
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Withdrawn
Application number
EP13742458.6A
Other languages
German (de)
English (en)
Inventor
Andreas Link
Gabriele KOLB
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
SnapTrack Inc
Original Assignee
Epcos AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Epcos AG filed Critical Epcos AG
Publication of EP2891244A1 publication Critical patent/EP2891244A1/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/703—Networks using bulk acoustic wave devices
    • H03H9/706—Duplexers
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03H—IMPEDANCE NETWORKS, e.g. RESONANT CIRCUITS; RESONATORS
    • H03H9/00—Networks comprising electromechanical or electro-acoustic devices; Electromechanical resonators
    • H03H9/70—Multiple-port networks for connecting several sources or loads, working on different frequencies or frequency bands, to a common load or source
    • H03H9/72—Networks using surface acoustic waves
    • H03H9/725—Duplexers
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B15/00—Suppression or limitation of noise or interference
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04L—TRANSMISSION OF DIGITAL INFORMATION, e.g. TELEGRAPHIC COMMUNICATION
    • H04L5/00—Arrangements affording multiple use of the transmission path
    • H04L5/14—Two-way operation using the same type of signal, i.e. duplex

Definitions

  • the invention relates to multiplexers with reduced intermodulation products, in particular multiplexers, in which frequency components which can lead to undesired intermodulation effects are suppressed or eliminated. Intermodulation products or intermodulation distortions
  • the disadvantage of this is that space must be provided on the surface of an expensive chip for the additional resonators. It is therefore an object of the present invention to provide a multiplexer with reduced intermodulation effects, which meets current miniaturization requirements, does not limit the power compatibility, in which the slope of the filter edges is not reduced and which is suitable for mass production. In particular, it is an object of the present invention to specify a multiplexer in which blocker frequencies are already eliminated at the antenna node itself or in the antenna-near circuit area become. Further, the multiplexer should be inexpensive herzustel ⁇ len and having measures for reducing intermodulation effects which readily with measures to reduce intermodulation effects due to other
  • Intermodulation effects be compatible. Furthermore, the electrical properties of the multiplexer should not be degraded by the measures to reduce the intermodulation effects.
  • the invention comprises an acoustical wave multiplexer having a transmitting terminal, a receiving terminal and a common terminal.
  • the multiplexer further comprises a transmission path connected between the transmission port and the common port and comprising a transmission filter and a reception path connected between the reception port and the common port and comprising a reception filter.
  • the multiplexer includes a chip and a blocker path connected to the common terminal.
  • the blocker path in this case comprises blocking electrodes arranged on the chip, which are provided to derive blocking signals to ground.
  • Blocker signals are signals multiplied by other signals propagating in the multiplexer. result in particular in an Rx frequency range and thus block the Rx path.
  • blocker electrodes are those electrodes that are designed to divert the blocker signals to ground.
  • the multiplexer works with acoustic waves.
  • SAWs Surface Acoustic Waves
  • Electrodes used in conjunction with a piezoelectric material serve to convert between acoustic oscillations and electrical high-frequency signals due to the piezoelectric effect.
  • Multiplexers operating with acoustic waves therefore have electrodes which are arranged in the form of structured electrode fingers on a piezoelectric substrate (in the case of surface acoustic waves or guided surface acoustic waves) or which sandwich a piezoelectric layer and have a large area.
  • the chip comprises the piezoelectric material.
  • acoustic bulk waves is the case of acoustic bulk waves.
  • multiplexer refers to a crossover network with at least one common terminal, which can be an antenna terminal, and a number of m Tx signal paths and n Rx signal paths, where m and n are natural numbers> 1.
  • the multiplexer it is possible for the multiplexer to be a duplexer with a Tx path and an Rx path.
  • the blocking electrodes may be electrodes of an acoustically active filter element. So can an active
  • Blocker element by its purely electrical effect, for. B. as a capacitive element, blocker signals in a first
  • Frequency range and prevent or reduce blocking signals in a second frequency range different from the first frequency range by its electro-acoustic effect It is also possible that the blocking element is designed to interact its all-electric effect and its electro ⁇ acoustic effect and better suppress blocker signals of a single frequency range.
  • the blocker path comprises circuit elements of the transmit filter or the receive filter.
  • interdigital structures in the form of interdigital transducers or sandwich-type BAW resonators come into question. Because these structures are designed accordingly, they can simultaneously serve as elements of the transmission path or the receive path on the one hand and on the other hand represent circuit elements can be derived via the blocker ⁇ signals to ground.
  • the multiplexer comprises one or more acoustic wave resonators having blocking electrodes in one or more blocker paths, each blocker path or each having acoustic waves
  • operating resonator with blocking electrodes is intended to derive two blocking frequencies.
  • the multiplexer comprises one or more further transmission paths, each with a further transmission filter and one or more reception paths, each with a further reception filter.
  • the transmit filter and / or the receive filter operates with surface acoustic waves, bulk acoustic waves, or guided acoustic volume waves.
  • the transmission filter works with one of the specified type of acoustic waves, while the reception filter works with a different type of acoustic waves. Then it is possible that the transmission filter or the
  • Electrode structures of the transmission filter are arranged on a first chip and the reception filter or the Empfangsfil ⁇ terelektroden are arranged on a further chip.
  • the Blocker electrodes can be arranged on the first chip and / or on the further chip. It is also possible that some circuit elements of the blocker path are arranged on the one chip, while other circuit elements of the blocker path are arranged on the further chip. The circuit elements of the blocker path can thereby work with under ⁇ difference handy types of acoustic waves.
  • the transmit filter comprises BAW resonators and the receive filter comprises SAW resonators.
  • the BAW resonators and the SAW resonators are on or in
  • Filter technologies the different requirements for send and receive filters, eg. As in terms of power resistance, selection, insulation, ensure.
  • the chip comprises all the circuit elements of the transmit filter and / or the receive filter. Then, the multiplexer operates only with a kind akusti ⁇ shear waves, wherein the circuit elements of the Blo ⁇ cker path can then be placed on the chip.
  • the blocker path includes an electronic-acoustic resonator disposed on the chip.
  • the electroacoustic resonator of the blocker path may be a series or parallel branch resonator of the transmit filter or of the receive filter.
  • the blocker path may include two or more electroacoustic resonators. So can the
  • Blocker path for example, a series circuit of a
  • Transmit or receive filters may include ladder type structure interconnected series and parallel arm resonators, the ladder type structure being a total bandpass filter. Also, only a part of the respective filter may be implemented as a ladder type structure, while others
  • Filter elements alternative topologies, eg. As DMS (Dual Mode SAW) structures include
  • Ladder type circuits connect the signal path to ground. So there is a ground path, which connects the common terminal to ground and can be derived via the blocker signals to ground.
  • the blocker path comprises an inductive element, which is designed as a metallization in the transmission filter or in the reception filter on the chip.
  • the inductive element is embodied as Metalli ⁇ tion in a multilayer substrate on which the chip is angeord ⁇ net. It is also possible that the inductive element is embodied as a discrete element on a module containing the chip, or as a discrete element on a Lei ⁇ terplatte which is connected with the chip.
  • the blocker path comprises blocker electrodes which constitute a capacitive element and an inductive element.
  • the capacitive and inductive element can be interconnected and thus a resonant circuit depicting ⁇ len in series or pa ⁇ rallel.
  • the resonant frequency of the resonant circuit can be so be adjusted so that its resonance frequency corresponds to the frequency of blocker signals, which are seen as particularly disturbing ⁇ .
  • the capacitance of the capacitive element can be adjusted by adjusting the area of BAW electrodes or the aperture and the transducer length or the number of fingers of
  • Interdigital structures can be adjusted. Furthermore, it is also substantially possible to appropriately provide the spacing of the electrodes for adjusting the capacitance.
  • the spacing of the electrode structures essentially determines the wavelength of the acoustic waves with which the multiplexer operates. It is possible that acoustic active electrode structures as blocking electrodes in the blocker path
  • the distance and the area of the blocker electrodes can be selected substantially arbitrarily to adjust the capacitance of the capacitive element.
  • the inductance of the inductive element can be adjusted by the length of the conductor sections of the inductive element who ⁇ . Further, it is possible to provide windings, wherein the number of turns can be adjusted to adjust the inductance of the inductive element. Overall, therefore, many options can be selected to represent the capacitance of the capacitive element or the inductance of the inductive element mitigate ⁇ to get a good dissipation of the blocker signals to ground.
  • the inductive element on a ge ⁇ rings inductance can only be lent be formed by a supply line, wherein the inductance of the inductive element is then the parasitic inductance of the supply line. If a low inductance is desired, the inductance is obtained as an intrinsic inductance of an already existing feed line, whereby space is saved and a small-sized multiplexer component is obtained.
  • the transmit filter and / or the receive filter comprise BAW resonators.
  • the blocker path has a BAW resonator, the mass assignment of which
  • Mass assignment of the resonators of the transmit filter and / or the ground assignment of the resonators of the receive filter deviates.
  • a capacitive element in the blocker path is obtained in which the electrical and / or acoustic properties of the blocker electrodes are optimized for the derivation of blocker signals to ground. Further, such a means is given to adjust the acoustic properties advantageous.
  • the blocker path comprises a BAW resonator having more or fewer layers than a resonator of the transmit filter or the receive filter.
  • the resonant frequency is greatly displaced and it will receive a favorable capacitive behavior in the frequency range of ⁇ pass bands.
  • the blocker path comprises a BAW resonator (R) in which one or more layers relative to a BAW resonator of the transmit filter (Tx) or
  • Receive filter (Rx) in the thickness is different / are.
  • the blocker path comprises a BAW resonator, wherein a physical property of a
  • Layer is changed compared to the physical properties of corresponding layers of resonators of the transmission filter and / or receiving filter.
  • Changing physi ⁇ cal properties, eg. B. the mass occupancy, the thickness, the number of layers, the acoustic impedance or the electrical conductivity is an easy way to obtain a BAW resonator, which is not only part of the transmit filter and / or receiving filter, but also part of blocker path and thus additional requirements ge ⁇ nügen needs.
  • the blocker path comprises a BAW resonator whose operating frequency is changed by geometry changes in comparison to BAW resonators of the transmit filter and / or receive filter.
  • a modified geometry at len acoustic sacrificenwel- working multiplexers for example, by a modified metallization, a change of the pitch, thus a change in the distance of finger electrodes center-to-center finger electrodes, or a change in the metallization ratio of approximately ⁇ n possible.
  • the resonance behavior of a resonator is not arbitrarily narrowband. Therefore, a positive effect is already he ⁇ aims, even if the resonant frequency of the resonant circuit - z.
  • Capacitance of the capacitive element can be chosen to be chosen to be chosen to be chosen to be chosen to be chosen to be chosen to
  • the blocker path includes a capacitive element that is acoustically inactive.
  • acoustically ⁇ table inactive element may be a capacitive element only in the corresponding frequency ranges such.
  • B. Tx frequency range or Rx frequency range is inactive, or which does not interact with acoustic waves. This is z.
  • Example possible to arrange a non-piezoelectric material instead of a piezoelectric material between BAW electrodes. It is also possible to conduct
  • the multiplexer thus comprises a BAW resonator with blocking electrodes, wherein at least one of the BAW electrodes and / or a conductive material
  • Electrode structures the alignment of the finger electrodes relative to possible directions of propagation acoustic
  • Coupling coefficient ⁇ 2 disappears.
  • Such capacitive elements Ele ⁇ act purely capacitive so that its physical dimensions may be chosen so that no negative electro-acoustic interaction with Tx or Rx signals occurs up.
  • the multiplexer with two or more blockers paths arranged on the chip Blockerelekt comprises clearing ⁇ provided to derive blocker signals to ground.
  • each blocker path being provided for deriving ground from a respective other blocker signal.
  • a large number of blocking frequencies can be rendered harmless without inter-modulation with Tx signals.
  • the multiplexer comprises a transmit filter and a receive filter.
  • the multiplexer further comprises a first blocker path interconnected with a node located between the transmit filter and the common port and a second blocker path interconnected with a node located between the receive filter and the common port.
  • a filter it is possible for a filter to have two, three, four or more blocker paths.
  • the multiplexer comprises exactly one transmit filter and exactly one receive filter and thereby represents a duplexer.
  • the sum of the frequencies of the Tx signal and the blocker signal substantially corresponds to the frequency of the Rx signals, z.
  • WCDMA band 2 with Tx frequencies between 1880 MHz and 1910 MHz and Rx frequencies between 1930 MHz and 1990 MHz with blocking frequencies around 20 MHz and 140 MHz
  • second order intermodulation products would lie in the Rx frequency range.
  • blocking signals are eliminated in this simple way so that intermodulation products do not arise at all.
  • the derivation of blocking signals is also advantageous if the amount of the difference between Tx signals and blocker signals corresponds to the frequency of the Rx signals. This is z. B. in block signals of the frequencies 3760 MHz and 3900 MHz the case.
  • resonators of the transmit filter and / or the receive filter are performed doubled, with the doubled resonators each being connected in anti-parallel to reduce non-linear effects.
  • the common connection is connected to ground via an inductive element, so that an ESD protection is obtained.
  • the inductive element passes through the common connection, z.
  • received ESD signals directly from ground, so that the transmission filter and in particular the sensitive receiving filter is protected by the broadband ESD signal.
  • the ESD protection path comprises a peeled ⁇ tes for the inductive element in series capacitive element next to the inductive element.
  • the transmit path between the transmit filter and the common port includes an impedance matching network. It is also possible for an impedance matching network to be arranged between the common connection and the reception filter.
  • the transmit filter of the multiplexer or the receive filter of the multiplexer comprises
  • Bandpass filter or a band stop filter can both be fabricated in SAW or BAW technology and thus the corresponding resonators can be arranged on the chip.
  • the multiplexer comprises one or more blocking frequency blocking circuits, the one or more blocking circuits being disposed between an antenna and the common terminal CC.
  • the multiplexer comprises a
  • Blocking circuit between the common terminal CC and a filter in the receiving or transmitting path.
  • an acoustically active element can be interconnected.
  • the multiplexer comprises a
  • a band rejection filter can be, for example, a notch filter whose blocking band lies in the region of the reception band of a reception path.
  • Notch filter can be electroacoustic resonators and inductive and / or capacitive circuit elements.
  • Such Notchfilter represents a so-called extractor filter and is suitable for interconnection with receiving path for
  • satellite-based systems such as GPS, Glonass, Compass or Galileo.
  • the multiplexer in a mobile communication device is included with another filter or multiple xer ⁇ and with two antennas.
  • the multiplexer conducts blocking signals coupled from one antenna to the other antenna to ground.
  • a transmission signal of the multiplexer can be coupled from an antenna connected to the multiplexer in a further diversity antenna together with an external Blo ⁇ ckersignal. This can result in unwanted intermodulation products in another multiplexer connected to the further / diversity antenna. To prevent this, it is possible that the
  • the mobile communication device comprises ⁇ as a further filter is a reception filter for GPS,
  • the further filter is a bidirec- tional single filter, for example, to offer fürsge ⁇ Bluetooth or Wi-Fi can be provided.
  • the multiplexer is in a mobile communication device with another
  • the multiplexer is designed to divert block signals which would be coupled via an antenna connected to the multiplexer in an interconnected with another signal path antenna of the communication device to ground.
  • the multiplexer thus ensures that blocking signals which would lead to interference in other multiplexers are diverted to ground.
  • the multiplexer is connected in a mobile communication device, comprising mobile communica tion device ⁇ another filter, or another multiple ⁇ xer. The multiplexer is then intended
  • Signal path of the communication device would be coupled to divert ground.
  • the multiplexer Possibility to neutralize blocker signals that would be coupled within the mobile communication device by crosstalk in other signal paths.
  • the multiplexer comprises a further filter, which may be the above-mentioned further filter or a second further filter.
  • the other filter is on Receive filter for GPS, Glonass, Galileo or Compass signals.
  • the band rejection filter is on
  • the band-stop filter on the side facing away from the antenna another filter or another multiplexer follows.
  • the multiplexer is in one
  • the multiplexer derives external blocking signals and / or signals due to direct crosstalk between the antennas from other multiplexers.
  • those signals are derived which, together or with their own transmission signals, would produce interfering intermodulation products if they were not
  • the multiplexer derives block signals from the outside and / or signals due to direct crosstalk in the own device, which may originate from other multiplexers of the device. These signals, if they were not derived, would produce interfering intermodulation products together or with their own transmit signals.
  • the multiplexer includes one or more blocker paths for eliminating such Intermodulation products, while not in their own
  • Disturbing multiplexers but could be radiated through its own antenna could be coupled into one of the other antennas and could cause interference in connected multiplexers.
  • the multiplexer includes one or more blocker paths for elimination of intermodulation products that would not interfere in their own multiplexer but by direct crosstalk in the device in other multiplexers.
  • At least one transmit or receive filter is included in the transmit or receive paths
  • At least one signal path contains only the low-order filter with one or more blocker paths.
  • only the low-order filter is absent in at least one signal path
  • the multiplexer is a diplexer, triplexer, quadplexer or quintplexer, or a high-order multiplexer.
  • the multiplexer will be explained in more detail below on the basis of exemplary embodiments and schematic figures.
  • Figure 1A is a chip surface having disposed thereon ⁇ finger electrodes of the interdigital transducer
  • FIG. 1B shows a chip surface with a chip surface arranged thereon
  • FIG. 2A shows a multiplexer with a capacitive element in a transmission filter
  • FIG. 2B shows a multiplexer with a capacitive element in a reception filter
  • FIG. 2C shows a multiplexer in which a common connection is connected to ground via a capacitive element
  • FIG. 3 shows a multiplexer and typical signal paths of
  • FIG. 6 shows a multiplexer with an acoustic resonator and an inductive element in a blocker path
  • Figure 7 shows a multiplexer with doubled executed
  • Resonators in a transmit or receive filter the equivalent circuit of an acoustic resonator, a multiplexer with a parallel branch resonator in the blocker path of a transmit or receive filter,
  • FIG. 10 shows a multiplexer with a series branch resonator and a parallel branch resonator in a transmitting or receiving filter
  • FIG. 11 shows a multiplexer with two inductive elements and an electroacoustic resonator in a blocker path
  • FIG. 12 shows a multiplexer with two inductive elements and two electroacoustic resonators in a blocker path
  • Figure 13 shows schematically an embodiment in which a
  • Transmission filter is a notch filter
  • FIG. 14 shows schematically the use of a multiplexer in a mobile communication device with more than one antenna
  • Figure 15 shows an embodiment of a multiplexer, wherein between an antenna terminal ANT and the common terminal CC a blocking circuit of a
  • FIG. 16 shows an embodiment of a multiplexer with a blocking circuit between the common terminal CC and a filter in the transmission path.
  • FIG. 1A shows the arrangement of interdigital structures on a chip surface.
  • CH electrode electrodes EFI comprehensive interdigital structures IDS of a SAW resonator SAWR are arranged.
  • This interdigital structures ⁇ interconnect a common terminal of a duplexer CC to ground GND.
  • the SAW resonator SAWR can be connected to a transmit filter-side signal path (Tx) or receive-side signal path (Rx) of the duplexer or directly to the common port CC.
  • Tx transmit filter-side signal path
  • Rx receive-side signal path
  • the interdigital structure IDS of the SAW resonator SAWR can be acoustically active or acoustically inactive in the working area of the duplexer. Regardless of the acoustic activity provides such interdigital structure is a capacitive element wel ⁇ ches can derive blocker signals to ground in blocker path so that intermodulation products mixed from blocker signals and propagating in the duplexer Tx or Rx signals do not occur.
  • the duplexer can work with surface acoustic waves. Then, it comprises more SAW resonators, and the interdigital structures of the IDS blocker path wall can be large without On ⁇ and arrange ⁇ without additional operations on the chip CH.
  • the chip CH can be a piezoelectric crystal, z.
  • FIG. 1B shows the arrangement of a BAW resonator BAWR as part of the Blocker path and its arrangement on a Oberflä ⁇ surface of a chip CH.
  • the BAW resonator can be connected directly to the common terminal CC or to a transmitter-side (Tx) or receiver-side (Rx) section of a signal path.
  • the BAW resonators ⁇ tor BAWR includes a first, lower electrode ELI and a second, upper electrode EL2. Between the two electrodes is disposed an insulating layer PL, which may be a piezoelectric layer and may comprise AlN (aluminum nitride) or ZnO (zinc oxide).
  • the electrodes ELI and EL2 represent the blocking electrodes, via which blocker signals can be diverted to ground. Does the
  • Resonator BAWR may be acoustically active or acoustically inactive. In any case, it represents a capacitive element, can be derived via the blocker signals to ground.
  • FIG. 2A shows an embodiment of a multiplexer with a Tx filter Tx and Rx filter Rx, wherein the Tx filter Tx is disposed between a Tx terminal and a common terminal TxC CC and the Rx filter Rx between ei ⁇ nem receiving terminal RxC and the common terminal CC is arranged.
  • a capacitive element CE comprising the blocker ⁇ electrodes of the blocker path is arranged in the transmit filter Tx and can blocker signals derived to ground, to reduce intermodulation products, or to avoid.
  • FIG. 2B shows an embodiment of a multiplexer, wherein a capacitive element CE, which comprises the blocking electrodes, is arranged in the reception filter Rx.
  • FIG. 2C shows an embodiment of a multiplexer, wherein a capacitive element CE, which comprises the blocker electrodes of the blocker path, is connected directly to the common terminal CC.
  • the capacitive element CE is neither part of the transmission filter Tx nor of the reception filter Rx. All ⁇ l ei recently the capacitive element CE may be disposed on the same chip as the transmission filter Tx or Rx Empfangsfil ⁇ ter.
  • FIG. 3 shows a multiplexer with m transmit signal paths Txl, 15 Tx2, Txm and m transmit filters Txl, Tx2, Txn and n receive signal paths with n receive filters Rxl, Rx2, Rxn.
  • the first, second or mth transmission filter is arranged between the first, second or mth transmission connection on the one hand and the common connection CC on the other hand.
  • the first, 20 second, n-th receiving filter Rxl, Rx2, Rxn is entspre ⁇ accordingly arranged between the first, second and n-th Empfangsan- circuit RXCl, RxC2, RxCn one hand and the common terminal CC other.
  • FRxl, FRx2, ..., FRxn are the receiver frequencies
  • FTxl, FTx2, FTxm are the 25 transmit frequencies.
  • the central idea of the invention is accordingly to blocker ⁇ signals of frequency F B i so derive 0 cker via the blocker path to ground that mixing with the transmission signals from the first reception filter Txl in the ideal case will be omitted but is at least significantly mitigated.
  • Figure 4 shows an embodiment of a multiplexer, wherein the blocker path BP comprises a capacitive element CE and an induct ⁇ tive element IE, which are connected in series.
  • the blocker path is connected directly to the common connection CC.
  • a matching network MN it is possible, but not mandatory, for a matching network MN to be arranged between the transmission filter Tx and the common connection CC.
  • a further matching network MN it is also possible, but not mandatory, for a further matching network MN to be arranged between the reception filter Rx and the common connection CC.
  • the capaci- In this case, the positive element CE of the blocker path BP comprises the Blo ⁇ cker electrodes, which are arranged together with electrodes of the resonators of the transmission filter or the reception filter.
  • the capacitive element CE can be an acoustically active or an acoustically inactive element.
  • FIG. 5 shows an embodiment of a multiplexer in which the blocking electrodes are part of a resonator structure R.
  • the resonator structure R can be acoustically active or inactive.
  • Figure 6 shows an embodiment of a duplexer, wherein the electrodes of the blocker blockers path BP are arranged in a resonator R, which are connected in series with an inductive element in ⁇ IE and not directly connected to the common check circuit CC.
  • Figure 7 shows an embodiment which is exemplary shown in the basis of a filter, which may be the transmit filter Tx or Rx filter Emp ⁇ fang as duplicated Re ⁇ sonatoren constitute a further feature for the reduction of intermodulation dulations occur.
  • the doubling can be carried out as a parallel doubling or as a serial doubling.
  • vias VIA can be bottom and top electrodes of doubled resonators
  • Interconnected electrodes of doubled resonators are shown thicker in FIG. 7 by way of example. Interconnected electrodes of doubled resonators can be connected via nodes (NOD), about the z. B. also a ground connection can be made, connected to each other.
  • NOD nodes
  • Figure 8 shows the equivalent circuit of an ECD elektroakusti ⁇ rule resonator R.
  • the equivalent circuit comprises thereby a static capacitance Co and in parallel connected in a Se rien circuit of a dynamic capacitance C D and a dynamic inductance L D.
  • the resonator is essentially a capacitive element with the static capacitance Co.
  • the dynamic capacitance C D and the dynamic inductance L D are essentially negligible. The situation is different in the working range of the resonator. Then, substantially the dynamic capacitance C D and the dy namic ⁇ inductance L D dominate the behavior of the resonator, currency ⁇ rend statistically capacitance Co plays a subordinate role.
  • a resonator can thus be operated as a pure capacitive element or as a pure electroacoustic element or as a mixed form of both elements, so that a resonator can be adapted to work as a filter element in the transmission filter or reception filter and at the same time as a blocking element in the blocker path to funkti ⁇ onieren.
  • no other method ⁇ steps of preparation are necessary for the provision of the resonator R in the blocker path substantially, so that the proposed multiplexer can be manufactured without additional expense and with known methods for reducing intermodulation effects can be used.
  • Figure 9 shows an embodiment of a multiplexer, wherein the blocker of the path a Parallelzweigresonator transmit (Tx) or receive filter (Rx) comprises, in the Blockerelek ⁇ trodes CE are arranged. Furthermore, the blocker path comprises an inductive element IE, so that a signal path can be obtained via the dimensioning of the electrodes CE and the inductive element IE, via which blocker signals can be selectively dissipated to ground.
  • Tx Parallelzweigresonator transmit
  • Rx receive filter
  • FIG. 10 shows an embodiment of a multiplexer in which the blocker path BP comprises a series branch resonator
  • the corresponding electrode structures and the inductive element are analogous to the embodiment of Figure 9 chosen so that a good derivative of blocking signals is obtained to ground.
  • FIG. 11 shows an embodiment of a multiplexer in which the blocker path BP comprises a first inductive element IE1, a second inductive element IE2 and resonator blocker electrodes of a capacitive element CE.
  • the values of the inductances of the elements IE1 and IE2 and the value of the capacitance of the capacitive element CE in the blocker path BP are selected so that a good derivation of blocker signals to ground is obtained.
  • FIG. 12 shows an embodiment of a multiplexer in which the blocker path BP comprises a first inductive element IE1, a second inductive element IE2 and blocking electrodes of a first capacitive element CE1 in a first resonator and further blocking electrodes in a second capacitive element CE2 in a parallel branch resonator.
  • inductive and capacitive elements are corresponding
  • FIG. 13 shows, analogously to FIG. 3, a front-end circuit in which a Tx filter has been replaced by a bandstop NOT, which is used for frequencies of an Rx filter Rx2
  • Filter Rx2 fall. There may also be intermodulation products that fall into another Rx filter. Here, too, blocker paths at node CC must be used to eliminate the blocking frequencies.
  • Figure 14 shows schematically a mobile communication device with diversity functionality. Ie. in addition to an antenna ANT there is another antenna ANT2, which additional
  • Each of the antennas can be interconnected with a multiplexer MUL, MUL2.
  • Blocker paths may now be provided in each of the multiplexers MUL, MUL2 in order to provide intermodulation products that are through
  • Coupling of signals from one antenna to the other antenna can arise to eliminate. It is also possible that one of the multiplexers MUL, MUL2 comprises blocker paths in order to derive blocker signals to ground, which would interfere with the reception as intermodulation products in the respective other multiplexer.
  • Figure 15 shows an embodiment of a multiplexer, wherein between an antenna terminal ANT and the common terminal CC, a blocking circuit of an inductance L and an on-chip capacitor X is connected.
  • the on-chip capacitance may be a resonator or a pure
  • Capacitive acting as a resonator constructed on-chip element If the on-chip capacitance X is a resonator, then there are two blocking frequencies that are generated by the blocking circuit.
  • FIG. 16 shows a blocking circuit between the common terminal CC and a filter in the transmission path.
  • the blocking circuit can also be arranged between the common terminal CC and a filter in the receiving path.
  • the blocking circuit comprises an inductance L and an on-chip capacitance X.
  • the on-chip capacitance X may be a resonator or a purely capacitive chip element.
  • a multiplexer according to the invention is not limited to one of the described embodiments. Combinations of the embodiments and variations, which z. B. include further inductive or capacitive elements in transmission filters, receiving filters or other circuit elements, represent also inventive embodiments. Reference sign list:
  • ANT, ANT2 Antenna
  • FRx2, FRx2, FRxn reception frequencies
  • FTxl, FTx2, FTxm transmission frequencies
  • MUL, MUL2 Multiplexer, second, further multiplexer
  • R (electroacoustic) resonator
  • Rx receive filter
  • Rxl, Rx2 receive filter
  • RxC, Rxn Reception port
  • RxCl, RxC2, RxCn Receive port
  • Txl, Tx2, Txm send filter
  • TxC transmission connection
  • TxCl, TxC2, TxCm transmission port

Landscapes

  • Engineering & Computer Science (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Acoustics & Sound (AREA)
  • Computer Networks & Wireless Communication (AREA)
  • Surface Acoustic Wave Elements And Circuit Networks Thereof (AREA)
  • Piezo-Electric Or Mechanical Vibrators, Or Delay Or Filter Circuits (AREA)

Abstract

L'invention concerne un multiplexeur (MUL) à produits d'intermodulation réduits. A cet effet, le multiplexeur (MUL) comprend un filtre d'émission et de réception (Tx, Rx) fonctionnant avec des ondes acoustiques, ainsi que des électrodes pour signaux de blocage (EL1, EL2) pour dévier des composantes de fréquence indésirables vers la masse (GND). Les électrodes pour signaux de blocage (EL1, EL2) sont disposées sur la même puce (CH) que le filtre fonctionnant avec des ondes acoustiques.
EP13742458.6A 2012-08-30 2013-07-30 Multiplexeur à produits d'intermodulation réduits Withdrawn EP2891244A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102012108030.5A DE102012108030B4 (de) 2012-08-30 2012-08-30 Multiplexer mit verringerten Intermodulationsprodukten
PCT/EP2013/066014 WO2014032889A1 (fr) 2012-08-30 2013-07-30 Multiplexeur à produits d'intermodulation réduits

Publications (1)

Publication Number Publication Date
EP2891244A1 true EP2891244A1 (fr) 2015-07-08

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EP13742458.6A Withdrawn EP2891244A1 (fr) 2012-08-30 2013-07-30 Multiplexeur à produits d'intermodulation réduits

Country Status (6)

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US (1) US9985607B2 (fr)
EP (1) EP2891244A1 (fr)
JP (1) JP6342897B2 (fr)
KR (1) KR20150048867A (fr)
DE (1) DE102012108030B4 (fr)
WO (1) WO2014032889A1 (fr)

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Publication number Publication date
DE102012108030A1 (de) 2014-03-06
US20150236840A1 (en) 2015-08-20
US9985607B2 (en) 2018-05-29
JP2015531221A (ja) 2015-10-29
DE102012108030B4 (de) 2018-05-09
WO2014032889A1 (fr) 2014-03-06
JP6342897B2 (ja) 2018-06-13
KR20150048867A (ko) 2015-05-07

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