Abstract: This disclosure relates generally to directional couplers. In one embodiment, a directional coupler includes a first port, a second port, a third port, a first inductive element, a second inductive element, a first switchable path, and a second switchable path. The first inductive element is coupled between the first port and the second port, while the second inductive element is mutually coupled to the first inductive element. The first switchable path is configured to be opened and closed, wherein the first switchable path is coupled between a first location of the second inductive element and the third port. The second switchable path is configured to be opened and closed, wherein the second switchable path is coupled between a second location of the second inductive element and the third port. In this manner, a directivity of the directional coupler can be switched between a forward direction and a reverse direction.

Abstract: Aspects disclosed herein include a multiple-input multiple-output (MIMO) antenna swapping circuit. The MIMO antenna swapping circuit includes primary switching circuitry configured to be coupled to a first antenna and a third antenna, and secondary switching circuitry configured to be coupled to a second antenna and a fourth antenna. The primary switching circuitry is coupled to the secondary switching circuitry via no more than three conductive mediums to enable antenna swapping between the first antenna, the second antenna, and the fourth antenna. By coupling the primary switching circuitry and the secondary switching circuitry via no more than three conductive mediums, it is possible to reduce the number of conductive medium in the MIMO antenna swapping circuit, thus helping to reduce cost, footprint, and complexity of the MIMO antenna swapping circuit.

Abstract: Disclosed is an RF front-end with improved insertion loss having at least a first resonator with a first port and a second port and at least a second resonator having a third port and a fourth port, wherein the first resonator and the second resonator are magnetically coupled by no more than 5%. Also included is at least one coupling structure coupled between the second port of the first resonator and the third port of the second resonator, wherein the coupling structure has a coupling control input for varying a coupling coefficient between the first resonator and the second resonator such that an RF signal transfer between the first port of the first resonator and the fourth port of the second resonator is controllably variable between 5% and 95%.

Abstract: Aspects disclosed herein include a multiple-input multiple-output (MIMO) antenna swapping circuit. The MIMO antenna swapping circuit includes primary switching circuitry configured to be coupled to a first antenna and a third antenna, and secondary switching circuitry configured to be coupled to a second antenna and a fourth antenna. The primary switching circuitry is coupled to the secondary switching circuitry via no more than three conductive mediums to enable antenna swapping between the first antenna, the second antenna, and the fourth antenna. By coupling the primary switching circuitry and the secondary switching circuitry via no more than three conductive mediums, it is possible to reduce the number of conductive medium in the MIMO antenna swapping circuit, thus helping to reduce cost, footprint, and complexity of the MIMO antenna swapping circuit.

Abstract: An apparatus including a main transistor-based switch having a first end node and a second end node and an ON-state linearization network that is coupled between the first end node and the second end node of the main transistor-based switch is disclosed. The ON-state linearization network is configured to receive a monitored signal that corresponds to a signal across the first end node and the second end node and cancel at least a portion of non-linear distortion generated by the main transistor-based switch when the main transistor-based switch is in an ON-state based on the monitored signal. A control signal applied to a control input of the ON-state linearization network causes the ON-state linearization network to activate when the main transistor-based switch is in the ON-state and to deactivate the ON-state linearization network when the main transistor-based switch is an OFF-state.

Abstract: RF front-end circuitry, which includes a first RF low noise amplifier (LNA) and a first reconfigurable RF filter, is disclosed. The RF front-end circuitry operates in one of a group of operating modes. The first reconfigurable RF filter, which has a first reconfigurable RF filter path, includes a first receive (RX) shunt switching element coupled between the first reconfigurable RF filter path and ground. The first reconfigurable RF filter path is coupled to an input of the first RF LNA. The group of operating modes includes a first operating mode and a second operating mode. During the first operating mode, the first RX shunt switching element is ON. During the second operating mode, the first RX shunt switching element is OFF and the first RF LNA receives and amplifies a first filtered RF receive signal from the first reconfigurable RF filter to provide a first receive signal.

Abstract: A coupled inductor structure includes a first three-dimensional inductor structure and a second three-dimensional folded inductor structure. At least a portion of the first three-dimensional folded inductor structure is located within a volume bounded by the second three-dimensional folded inductor structure. By nesting the first three-dimensional folded inductor structure within the second three-dimensional folded inductor structure, a variety of coupling factors can be achieved while minimizing the size of the coupled inductor structure.

Abstract: RF receive circuitry, which includes a first output impedance matching circuit coupled to a first alpha output of a first alpha LNA, a second output impedance matching circuit coupled to a first beta output of a first beta LNA, and a first dual output RF LNA, is disclosed. The first dual output RF LNA includes the first alpha LNA, the first beta LNA, and a first gate bias control circuit, which is coupled between a first alpha input of the first alpha LNA and ground; is further coupled between a first beta input of the first beta LNA and the ground; is configured to select one of enabled and disabled of the first alpha LNA using an alpha bias signal via the first alpha input; and is further configured to select one of enabled and disabled of the first beta LNA using a beta bias signal via the first beta input.

Abstract: A reconfigurable RF receive diplexer, which includes a first hybrid RF coupler, a second hybrid RF coupler, and reconfigurable RF filter circuitry, is disclosed. The reconfigurable RF receive diplexer receives a first adjunct RF antenna receive signal via a first isolation port to provide a first adjunct RF receive signal via a second main port. The reconfigurable RF receive diplexer further receives a first RF transmit signal via a first main port to provide a first RF antenna transmit signal via the first isolation port. The reconfigurable RF receive diplexer operates in each of a group of operating modes, such that during a first operating mode, a carrier frequency of the first adjunct RF antenna receive signal is within a first RF communications band; and during a second operating mode, a carrier frequency of the first adjunct RF antenna receive signal is within a second RF communications band.

Abstract: Embodiments of radio frequency (RF) filtering circuitry are disclosed. In one embodiment, the RF filtering circuitry includes a common port, a second port, a third port, a first RF filter path, and a second RF filter path. The first RF filter path is connected between the common port and the second port and comprises a first pair of resonators and a first acoustic wave resonator. One of the first pair of resonators also includes a second acoustic wave resonator. The second RF filter path is connected between the common port and the third port. The second RF filter path includes a second pair of resonators. The first and second acoustic wave resonators of the first RF filter path increase roll-off greatly with respect to just an LC filter, and thereby allow for an increase out-of-band rejection at high frequency ranges.

Abstract: RF front end circuitry includes a first antenna node, a second antenna node, a diplexer, a first band filter, a second band filter, and switching circuitry. The diplexer may be used to separate signals for carrier aggregation, providing signals within a first RF frequency band to the first band filter and signals within a second RF frequency band to the second band filter. Further, by strategically arranging the switching circuitry, the diplexer may also be used as a multiple-input-multiple-output filter, such that additional filters are not required to support one or more MIMO modes of the RF front end circuitry.

Abstract: Circuitry includes a primary antenna node, a secondary antenna node, a first set of input/output nodes, a second set of input/output nodes, a first diplexer, a second diplexer, and switching circuitry. The switching circuitry is arranged such that any one of the first set of input/output nodes and the second set of input/output nodes can be connected to the primary antenna node or the secondary antenna node, either through the first diplexer, the second diplexer, or directly by bypassing the first diplexer and the second diplexer while providing minimal insertion loss. In particular, the number of closed series switches in the signal paths provided between the one of the first set of input/output nodes and the second set of input/output nodes is minimized while still providing a large amount of flexibility in the switching paths that can be created by the switching circuitry.

Abstract: Radio frequency (RF) filtering circuitry includes a number of filtering elements and switching circuitry configured to rearrange the filtering elements between a common node, a first input/output node, a second input/output node, and a third input/output node such that the RF filtering circuitry is capable of supporting carrier aggregation between RF signals within a first RF frequency band and RF signals within a second RF frequency band, as well as between RF signals within a first portion of the second RF frequency band and a second portion of the second RF frequency band.

Abstract: Antenna swapping circuitry includes a first pole, a second pole, a first throw, a second throw, and a number of switching elements. A first switching element is coupled between the first pole and the first throw. A second switching element is coupled between the first pole and the second throw. A third switching element is coupled between the second pole and the first throw. A fourth switching element is coupled between the second pole and the second throw. A linearity of the first switching element and the fourth switching element is higher in a closed state of operation than in an open state of operation. A linearity of the second switching element and a third switching element is higher in an open state of operation than in a closed state of operation.

Abstract: The present disclosure relates to antenna swapping for a wireless, e.g., cellular, radio system. In particular, embodiments of a single-die antenna swapping switching circuit are disclosed. In some embodiments, the single-die antenna swapping switching circuit enables antenna swapping in a wireless device using only two coaxial cables or transmission line connections regardless of an order of an antenna multiplexer of the wireless device. This results in significant space savings, particularly as the order of the antenna multiplexer increases, compared to antenna swapping techniques that require a pair of coaxial cables or transmission lines for each order of the antenna multiplexer. In addition, the single-die antenna swapping switching circuit is designed to be located between a radio front-end system and the antenna multiplexer such that intermodulation distortion and harmonics resulting from the switches comprised in the single-die antenna swapping switching circuit are mitigated.

Abstract: RF circuitry, which includes a first hybrid RF coupler, a second hybrid RF coupler, and a third hybrid RF coupler, is disclosed. The first hybrid RF coupler is coupled to a first RF antenna. The second hybrid RF coupler is configured to receive a first lowband RF receive signal via the first RF antenna. The first hybrid RF coupler is configured to receive one of a first midband RF receive signal and a first highband RF receive signal via the first RF antenna. The third hybrid RF coupler configured to receive another of the first midband RF receive signal and the first highband RF receive signal via the first RF antenna.

Abstract: RF filtering circuitry includes a first transmit signal node, a second transmit signal node, a common node, first transmit signal filtering circuitry, second transmit signal filtering circuitry, and transmit signal cancellation circuitry. The first transmit signal filtering circuitry is coupled between the first transmit signal node and the common node and is configured to pass RF transmit signals within a first transmit signal frequency band while attenuating signals outside the first transmit signal frequency band. The second transmit signal filtering circuitry is coupled between the second transmit signal node and the common node and is configured to pass RF transmit signals within a second transmit signal frequency band while attenuating signals outside the second transmit signal frequency band. The transmit signal cancellation circuitry is coupled between the common node and the second transmit signal node and is configured to generate a transmit cancellation signal.

Abstract: Front end circuitry for a wireless communication system includes a first antenna node, a second antenna node, a first triplexer, a second triplexer, and front end switching circuitry coupled between the first triplexer, the second triplexer, the first antenna node, and the second antenna node. The front end switching circuitry is configured to selectively couple the first triplexer to one of the first antenna node and the second antenna node and couple the second triplexer to a different one of the first antenna node and the second antenna node. By using a first triplexer and a second triplexer in the mobile front end circuitry, the mobile front end circuitry may operate in one or more carrier aggregation configurations while reducing the maximum load presented to the first antenna node and the second antenna node, thereby improving the performance of the front end circuitry.

Abstract: The present disclosure relates to antenna swapping for a wireless, e.g., cellular, radio system. In particular, embodiments of a single-die antenna swapping switching circuit are disclosed. In some embodiments, the single-die antenna swapping switching circuit enables antenna swapping in a wireless device using only two coaxial cables or transmission line connections regardless of an order of an antenna multiplexer of the wireless device. This results in significant space savings, particularly as the order of the antenna multiplexer increases, compared to antenna swapping techniques that require a pair of coaxial cables or transmission lines for each order of the antenna multiplexer. In addition, the single-die antenna swapping switching circuit is designed to be located between a radio front-end system and the antenna multiplexer such that intermodulation distortion and harmonics resulting from the switches comprised in the single-die antenna swapping switching circuit are mitigated.

Abstract: RF circuitry includes a filter, a termination impedance, and band switching circuitry. The filter is coupled between a first input/output node and a common node and configured to pass RF signals within a transmit portion of a first operating band from the first input/output node to the common node while attenuating signals outside of the transmit portion of the first operating band. The termination impedance is coupled between a termination impedance node and ground. The band switching circuitry is configured to couple the termination impedance node to the first input/output node such that the termination impedance is coupled between the first input/output node and ground in a first mode of operation. In a second mode of operation, the band switching circuitry is configured to provide RF transmit signals within the transmit portion of the first operating band to the first input/output node.