Abstract: A radio-frequency architecture can include a first circuit configured to support a first frequency range, and a second circuit configured to support a second frequency range. The first circuit can be further configured to provide an impedance at or near a short circuit impedance for a signal in the second frequency range, the second circuit can be further configured to provide an impedance at or near a short circuit impedance for a signal in the first frequency range. The architecture can further include a coupling circuit having a common node and configured to couple the common node to the first circuit and to couple the common node to the second circuit. The coupling circuit can include a resonator such that the signal in the second frequency range is sufficiently excluded from the first circuit, and the signal in the first frequency range is sufficiently excluded from the second circuit.

Abstract: Devices and methods related to wideband multiplexer for radio-frequency (RF) applications. In some embodiments, a multiplexer may include a common path configured to receive a plurality of RF signals. The multiplexer may further include a first path having an output coupled to the common path and configured to provide a band-pass response for a frequency band BX. The multiplexer may further include a second path having an output coupled to the common path such that RF signals in the first and second paths are combined and routed through the common path. The second path may be configured to provide a band-stop response for the frequency band BX such that the common path includes a wideband response that includes the frequency band BX and one or more other frequency bands.

Abstract: A radio frequency multiplexer including a signal node to receive and/or transmit radio frequency signals, a first signal processing component to pass frequencies in a first band and reject frequencies in a second band, a second signal processing component to pass frequencies in the second band and reject frequencies in the first band, and a coupling circuit. The coupling circuit is coupled to the signal node and the first and second signal processing components and configured to couple the first signal processing component and the second signal processing component to the common signal node and in parallel with one another in a first mode, and to couple only the second signal processing component to the signal node in a second mode with the second signal processing component being coupled in series with the first signal processing component between the first signal processing component and the signal node.

Abstract: A circuit comprising a first output, a second output, an input, a lattice filter stage, and a ladder filter stage. The ladder filter stage is coupled to the input and to the lattice filter stage, the lattice filter stage including at least one resonator coupled to the first output and to the ladder filter stage, at least one resonator coupled to the second output and to the ladder filter stage, the ladder stage including at least one resonator coupled to the input and at least one resonator coupled to a common connection.

Abstract: Bride combiners with resonators for radio-frequency applications. A bridge combiner can be implemented as a coupling circuit that includes a common node and configured to couple the common node to a first group of filters through a first path and to couple the common node to a second group of one or more filters through a second path. The coupling circuit can include a resonator such that an impedance provided by each filter of the first group for a signal in each band of the second group results in the signal being sufficiently excluded from the first path, and such that an impedance provided by each filter of the second group for a signal in each band of the first group results in the signal being sufficiently excluded from the second path.

Abstract: Devices and methods related to wideband multiplexer for radio-frequency (RF) applications. In some embodiments, a multiplexer may include a common path configured to receive a plurality of RF signals. The multiplexer may further include a first path having an output coupled to the common path and configured to provide a band-pass response for a frequency band BX. The multiplexer may further include a second path having an output coupled to the common path such that RF signals in the first and second paths are combined and routed through the common path. The second path may be configured to provide a band-stop response for the frequency band BX such that the common path includes a wideband response that includes the frequency band BX and one or more other frequency bands.

Abstract: Radio frequency front end modules are provided. In one aspect, a front end system includes at least one power amplifier configured to amplify a transmit radio frequency signal, at least one low noise amplifier configured to receive a receive radio frequency signal, an output node coupled to an antenna. The front end system further includes at least one switch configured to selectively couple the output node to the at least one power amplifier during a transmit period and to the at least one low noise amplifier during a receive period, at least one transmit filter coupled between the power amplifier and the at least one switch, and at least one receive filter coupled between the low noise amplifier and the at least one switch.

Abstract: A carrier aggregation circuit can include a mid-band path having a filter assembly and a phase shifting circuit, to support one or more frequency bands. The circuit can further include first and second high-band paths each being configured to support a frequency band and having a filter and a phase shifting circuit. Selected high-band filter and the mid-band filter assembly can be configured to provide impedances having the same sign for imaginary parts, and the phase shifting circuit of the mid-band path can be configured to provide a desired reflection coefficient phase at one of the first and second high-band frequency bands. The circuit can further include a common node coupled to outputs of the mid-band, first high-band and second high-band paths, and a tuning circuit implemented to remove the imaginary part of the impedance of the mid-band filter assembly at the frequency band of the selected high-band filter.

Abstract: Radio frequency front end modules are provided. In one aspect, a front end system includes at least one power amplifier configured to amplify a transmit radio frequency signal, at least one low noise amplifier configured to receive a receive radio frequency signal, an output node coupled to an antenna. The front end system also includes a first switch configured to selectively couple the output node to the at least one power amplifier during a transmit period and to the at least one low noise amplifier during a receive period, at least one transmit filter coupled between the power amplifier and the at least one switch, and at least one receive filter coupled between the low noise amplifier and the at least one switch. The front end system further includes a transmit supplemental filter, a receive supplemental filter, and a second switch.

Abstract: Radio frequency (RF) systems with tunable filters are provided herein. In certain embodiments, an RF system includes a first RF processing circuit configured to process a first frequency band of a first communication standard and a second frequency band of a second communication standard. The first frequency band and the second frequency band are close in frequency and/or partially overlapping in frequency. The first RF processing circuit includes a tunable filter for changing the bandwidth of the first RF processing circuit to enhance the robustness of the first RF processing circuit to blocker or jammer signals of a third frequency band.

Abstract: A filter module comprises a first terminal, a second terminal, and a filter disposed along each signal path extending from the first terminal to the second terminal, the filter including a plurality of series resonators and a plurality of shunt resonators disposed between the series resonators and a ground, at least one resonator among the plurality of series resonators and the plurality of shunt resonators being a first type of resonator with a temperature compensating layer for better temperature coefficient of frequency, at least one resonator among the plurality of series resonators and the plurality of shunt resonators being a second type of resonator without a temperature compensating layer.

Abstract: A carrier aggregation circuit can include a mid-band path having a filter assembly and a phase shifting circuit, to support one or more frequency bands. The circuit can further include first and second high-band paths each being configured to support a frequency band and having a filter and a phase shifting circuit. Selected high-band filter and the mid-band filter assembly can be configured to provide impedances having the same sign for imaginary parts, and the phase shifting circuit of the mid-band path can be configured to provide a desired reflection coefficient phase at one of the first and second high-band frequency bands. The circuit can further include a common node coupled to outputs of the mid-band, first high-band and second high-band paths, and a tuning circuit implemented to remove the imaginary part of the impedance of the mid-band filter assembly at the frequency band of the selected high-band filter.

Abstract: Radio frequency front end modules are provided. In one aspect, a front end system includes at least one power amplifier configured to amplify a transmit radio frequency signal, at least one low noise amplifier configured to receive a receive radio frequency signal, an output node coupled to an antenna. The front end system further includes at least one switch configured to selectively couple the output node to the at least one power amplifier during a transmit period and to the at least one low noise amplifier during a receive period, at least one transmit filter coupled between the power amplifier and the at least one switch, and at least one receive filter coupled between the low noise amplifier and the at least one switch.

Abstract: Devices and methods related to wideband multiplexer for radio-frequency (RF) applications. In some embodiments, a multiplexer may include a common path configured to receive a plurality of RF signals. The multiplexer may further include a first path having an output coupled to the common path and configured to provide a band-pass response for a frequency band BX. The multiplexer may further include a second path having an output coupled to the common path such that RF signals in the first and second paths are combined and routed through the common path. The second path may be configured to provide a band-stop response for the frequency band BX such that the common path includes a wideband response that includes the frequency band BX and one or more other frequency bands.

Abstract: Disclosed is a diversity receive radio frequency front-end architecture with support for carrier aggregation and multiple-input/multiple-output. The front-end architecture can include multi-stage low noise amplifiers. Outputs from multiple initial low noise amplifier stages can be switched into each secondary low noise amplifier stage, thereby reducing the amount of componentry. The secondary low noise amplifier stages can be dynamically tuned depending on a currently active band and can be relatively broadband compared to the initial low noise amplifier stages.

Abstract: Bulk acoustic wave resonators of two or more different filters can be on a common die. The two filters can be included in a multiplexer, such as a duplexer, or implemented as standalone filters. With bulk acoustic wave resonators of two or more filters on the same die, the filters can be implemented in less physical space compared to implementing the same filters of different die. Related methods, radio frequency systems, radio frequency modules, and wireless communication devices are also disclosed.

Abstract: Radio frequency front end modules implementing coexisting time division duplexing and frequency division duplexing are provided. In one aspect, a front end system includes a time-division duplexing transmit terminal, a time-division duplexing receive terminal, a frequency division duplexing terminal, and an antenna terminal. The front end system further includes first, second, and third switches configured to selectively connect the terminals to either a node or the antenna. The front end system also includes a controller configured to provide delays between disconnecting the terminals from the antenna and connecting the terminals to the node.

Abstract: A combiner circuit can be implemented as a coupling circuit having a common node and configured to couple the common node to one of first and second groups of filters through a first path and to couple the common node to the other group through a second path. The coupling circuit can be further configured such that the impedance provided by each filter of the one of the first and second groups for a signal in each band of the other group results in the signal being sufficiently excluded from the first path.

Abstract: In some embodiments, an architecture can include a first group of filters each configured to support a band such that a first frequency range covers the respective bands, and a second group of one or more filters each configured to support a band such that a second frequency range covers the respective one or more bands. Each filter of the first group can be configured to provide an impedance at or near a short circuit impedance for a signal in each band of the second group, and each filter of the second group can be configured to provide an impedance at or near a short circuit impedance for a signal in each band of the first group. The filters of the first and second groups can be implemented as one or more multiplexers. The architecture can further include a coupling circuit having a common node and configured to couple the common node to the one or more multiplexers through a first path and a second path.

Abstract: Bride combiners with resonators for radio-frequency applications. A bridge combiner can be implemented as a coupling circuit that includes a common node and configured to couple the common node to a first group of filters through a first path and to couple the common node to a second group of one or more filters through a second path. The coupling circuit can include a resonator such that an impedance provided by each filter of the first group for a signal in each band of the second group results in the signal being sufficiently excluded from the first path, and such that an impedance provided by each filter of the second group for a signal in each band of the first group results in the signal being sufficiently excluded from the second path.