Abstract: A RF front-end having two antenna switches operatively connected to two separate antennas. The antenna switches can be used to route various transmit and receive paths to the antennas. In particular, one of the antenna switches has three switch position for use in selectively routing the 2 GHz receive paths, and another antenna switch has six switch positions for use in selectively routing the 2 GHz transmit paths and the 1 GHz signal paths. With the disclosed topology, the front-end can be used to support GSM and W-CDMA communications in many regional variants in the world. The supported variants include US1, US2, EU1, EU2 and EU/US modes. The same front-end can also be used in BT/WLAN connectivity. For MIMO purposes, one more antenna switch for the 2 GHz receive paths can be added to the same RF front-end.

Abstract: A receive front-end module having one or more 2 GHz Rx paths and one or more W-CDMA Rx paths for use in a portable communication device, such as a mobile phone or a communicator device. The module comprises at least two feed points operatively connected to two electrically separate antennas for receiving communication signals. The module also comprises filters for filtering the communication signals in corresponding frequency band, and means for providing cross-band isolation. The cross-band isolation is achieved by using linear amplifiers in different signal paths, for example. Advantageously, the module comprising three signal paths so that one or more modules can be used together to achieve MIMO/diversity functionality.

Abstract: The present invention relates to a transceiver device having a switching arrangement and to a method of improving such a switching arrangement, wherein an input impedance of a duplexer means, as seen by a switching means (10) at a predetermined frequency, is transformed to a predetermined maximum or a minimum value. The switching means is used to selectively connect an antenna port to a transmitting and receiving path which leads to the duplexer means (14). The transformation of the input impedance can be achieved by providing a phase shifter (20) between a switching means (10) and the duplexer means (14). Thereby, the phase of the impedance can be optimized for minimal intermodulation distortion and to relax switch linearity requirements, so that the switching means (10) can be used for switching duplex signals.

Abstract: In an RF front-end having a plurality of signal paths connectable to an internal antenna or an external antenna, an antenna switch part is used to select either the internal or the external antenna. In the antenna switch part, two series switches are used to operatively connect to the same connection point in each signal path. These two series switches are separately connected to two different antennas for selecting one of the antennas in order to route the signals in that signal path. For providing further isolation between signal paths, each signal path can be connected to a shunt switch near the connection point. Only the shunt switch connected to the selected signal path is operated in an open position, all the other shunt switches are operated in a closed position.

Abstract: A method for improving heat dissipation in an encapsulated electronic package usually referred to as a chip-size SAW package. The package comprises one or more acoustic-wave components fabricated on a die, which is disposed on an electrically non-conductive carrier separated by electrically conducting bumps. The top of the package is covered by a laminate and a hermetic seal layer. Heat dissipation can be improved by removing a part of the laminate and then depositing a layer of thermal conducting material on the package, and by providing one or more heat conducting paths through the carrier.

Abstract: A receive front-end module in a multi-band communication device. The communication device comprises a plurality of signal paths for receiving and transmitting communication signals in a plurality of frequency bands in GSM and W-CDMA modes. The signal paths in the receive front-end module are operatively connected to a common feed point, which is connected to one of the RF antennas of the communication device, and the signal paths are selected such that none of the frequency bands for receiving communication signals in the receive front-end module are overlapping. If the communication device also transmits the communication signal in at least one transmit frequency range partially overlapping with one of the frequency bands in the receive front-end module, switching means is provided to at least one of signal paths in the receive front-end module for providing cross-band isolation between the transmitted and received communication signals.

Abstract: A duplexer comprising a transmit resonator device and a receive resonator device for filtering transmit and receive signals. The resonator device has a first BAW resonator for generating an acoustic wave signal from an input electric signal, a first acoustic delay for delaying the acoustic wave signal, and an intermediate BAW resonator for receiving the delayed acoustic wave signal at one end and converting the delayed acoustic wave signal to an electric signal. Through electrical coupling, the electric signal also appears at another end of the intermediate BAW resonator for generating a further acoustic wave signal at the other end. The resonator further comprises a second delay for delaying the further acoustic wave signal, and a second BAW resonator for producing an output electric signal from the delayed further acoustic wave signal. The duplexer can be used in a transceiver in a mobile phone.

Abstract: The combination of filters and switches is used to solve the non-linearity problems in GSM/W-CDMA transceiver front-end wherein one common antenna is used for both the GSM mode and the W-CDMA mode. In particular, separate Rx/Tx paths and switches in the Rx paths are used to provide cross-band isolation between bands. All of the switches in the transceiver are disposed after the filters in that no switches are disposed between the filters and the antenna. Furthermore, bandpass filters are matched to one common node even if they are only disconnected at the output as long as the impedance at the output can be controlled.

Abstract: A RF front-end having two antenna switches operatively connected to two separate antennas. The antenna switches can be used to route various transmit and receive paths to the antennas. In particular, one of the antenna switches has three switch position for use in selectively routing the 2 GHz receive paths, and another antenna switch has six switch positions for use in selectively routing the 2 GHz transmit paths and the 1 GHz signal paths. With the disclosed topology, the front-end can be used to support GSM and W-CDMA communications in many regional variants in the world. The supported variants include US1, US2, EU1, EU2 and EU/US modes. The same front-end can also be used in BT/WLAN connectivity. For MIMO purposes, one more antenna switch for the 2 GHz receive paths can be added to the same RF front-end.

Abstract: A duplexer comprising a transmit resonator device and a receive resonator device for filtering transmit and receive signals. The resonator device has a first BAW resonator for generating an acoustic wave signal from an input electric signal, a first acoustic delay for delaying the acoustic wave signal, and an intermediate BAW resonator for receiving the delayed acoustic wave signal at one end and converting the delayed acoustic wave signal to an electric signal. Through electrical coupling, the electric signal also appears at another end of the intermediate BAW resonator for generating a further acoustic wave signal at the other end. The resonator further comprises a second delay for delaying the further acoustic wave signal, and a second BAW resonator for producing an output electric signal from the delayed further acoustic wave signal. The duplexer can be used in a transceiver in a mobile phone.

Abstract: A method for improving heat dissipation in an encapsulated electronic package usually referred to as a chip-size SAW package. The package comprises one or more acoustic-wave components fabricated on a die, which is disposed on an electrically non-conductive carrier separated by electrically conducting bumps. The top of the package is covered by a laminate and a hermetic seal layer. Heat dissipation can be improved by removing a part of the laminate and then depositing a layer of thermal conducting material on the package, and by providing one or more heat conducting paths through the carrier.

Abstract: A receive front-end module in a multi-band communication device. The communication device comprises a plurality of signal paths for receiving and transmitting communication signals in a plurality of frequency bands in GSM and W-CDMA modes. The signal paths in the receive front-end module are operatively connected to a common feed point, which is connected to one of the RF antennas of the communication device, and the signal paths are selected such that none of the frequency bands for receiving communication signals in the receive front-end module are overlapping. If the communication device also transmits the communication signal in at least one transmit frequency range partially overlapping with one of the frequency bands in the receive front-end module, switching means is provided to at least one of signal paths in the receive front-end module for providing cross-band isolation between the transmitted and received communication signals.

Abstract: A receive front-end module having one or more 2 GHz Rx paths and one or more W-CDMA Rx paths for use in a portable communication device, such as a mobile phone or a communicator device. The module comprises at least two feed points operatively connected to two electrically separate antennas for receiving communication signals. The module also comprises filters for filtering the communication signals in corresponding frequency band, and means for providing cross-band isolation. The cross-band isolation is achieved by using linear amplifiers in different signal paths, for example. Advantageously, the module comprising three signal paths so that one or more modules can be used together to achieve MIMO/diversity functionality.

Abstract: A transceiver front-end having a plurality of signal paths operatively connected to at least two electrically separated antennas for transmitting and receiving communication signals in a plurality of frequency bands in GSM and W-CDMA modes. If the frequency band of one signal path is partially overlapping with the frequency band of another signal path, these two signal paths are connected to two different antennas. As such, some of the switching components and matching elements in the transceiver front-end can be eliminated. As a result, the reception loss can be reduced.

Abstract: A filter arrangement for use in a multiband dual-mode mobile phone. In particular, the mobile phone is operable in a W-CDMA mode and a band-reject filter comprising at least a series and a shunt acoustic-wave resonators is used to create a deep notch at the receive frequency band. The band-reject filter further includes a plurality of inductive elements for matching static capacitance of the resonators at the passband frequency. The mobile phone is also operable in 1800 and 1900 GSM bands. The band-reject filter is operatively connected to a harmonic trap in order to eliminate the third harmonic of these GSM bands. The mobile phone is also operable in the lower GSM band, for which a harmonic filter can share an antenna path with the band-reject filter.

Abstract: A filter arrangement for use in a multiband dual-mode mobile phone. In particular, the mobile phone is operable in a W-CDMA mode and a band-reject filter comprising at least a series and a shunt acoustic-wave resonators is used to create a deep notch at the receive frequency band. The band-reject filter further includes a plurality of inductive elements for matching static capacitance of the resonators at the passband frequency. The mobile phone is also operable in 1800 and 1900 GSM bands. The band-reject filter is operatively connected to a harmonic trap in order to eliminate the third harmonic of these GSM bands. The mobile phone is also operable in the lower GSM band, for which a harmonic filter can share an antenna path with the band-reject filter.

Abstract: A resonator structure (1200, 1300, 1400), where a certain wave mode is piezoelectrically excitable, comprises at least two conductor layers (110, 120) and at least one piezoelectric layer (110) in between the conductor layers, said conductor layers and piezoelectric layer extending over a first area of the resonator structure, which first area is a piezoelectrically excitable area of the resonator structure. The resonator structure is characterized in that it comprises a frame-like zone (2, 4) confining a center area (3) within the first area, a cut-off frequency of the piezoelectrically excited wave mode in the layer structure of the frame-like zone is different from that in the layer structure of the center area, and width of the frame-like zone and acoustical properties of the layer structure in the frame-like zone are arranged so that displacement relating to the piezoelectrically excited strongest resonance mode is substantially uniform in the center area of the resonator.

Abstract: Resonator structure (600, 800, 810, 820) comprises two conductor layers (110, 120) and a piezoelectric layer (100) in between the conductor layers, and said conductor layers and piezoelectric layer extend over a first area of the resonator structure, which first area is a piezoelectrically excitable area of the resonator structure. The resonator structure is characterized in that it is arranged to have a zone (603, 801, 803, 804), which confines a center area (604, 802) within the first area of the resonator, and the layer structure in the zone is arranged to be such that piezoelectrically excited vibrations are dampened more effectively in the zone than in the center area.

Abstract: A function-oriented manufacturing approach in RF front-end architecture for use in a multi-band mobile phone. Electronic components in a front-end module, such as low-noise amplifiers that require the demanding silicon bipolar process, are fabricated separately from those components in an RF-ASIC that require the less demanding, yet more costly, Bi-CMOS process. When the transmission frequency band and the receiving band overlap, separate receiving antenna and transmitting antenna are used, instead of an antenna switch module with a duplexer, connected to separate bandpass filters for band selection. Differential Rx antennas are used so that the whole Rx-chain can be made differential. Furthermore, different impedances for Tx out and Rx in can be realized.

Abstract: A filter structure (900, 1300, 1400, 1610) comprises a filter section (900) having at least two branches (901, 902) connected in parallel. A first branch (901) of said at least two branches comprises a first plurality (921, 701) of piezoelectric resonators connected in series, and a second branch (902) of said at least two branches comprises a second plurality (922, 702) of piezoelectric resonators and phase shifting means (910) connected in series. The phase shifting means are arranged to provide a phase shift of substantially 180 degrees.