Abstract: RF filtering circuitry includes a common node, a first input/output node, a second/input output node, a first filter coupled between the common node, the first input/output node, and the second input/output node, and a second filter coupled between the common node, the first input/output node, and the second input/output node. The first filter is configured to provide a first bandpass filter response between the common node and the first input/output node, where the first bandpass filter response is configured to pass RF signals within a first subset of the first frequency band while attenuating other signals. Further, the first filter is configured to provide a bandstop filter response between the common node and the second input/output node, where the bandstop filter response is configured to attenuate RF signals within the first subset of the first frequency band while passing other signals.

Abstract: This disclosure relates generally to radio frequency (RF) front-end circuitry for routing RF signals to and/or from one or more antennas. Exemplary RF front-end circuitry includes a multiple throw solid-state transistor switch (MTSTS) and a multiple throw microelectromechanical switch (MTMEMS). The MTSTS may be configured to selectively couple a first pole port to any one of a first set of throw ports. The MTMEMS is configured to selectively couple a second pole port to any one of a second set of throw ports. The second pole port of the MTMEMS is coupled to a first throw port in the first set of throw ports of the MTSTS. The MTSTS helps prevent hot switching in the MTMEMS since the first throw port of the MTSTS may be decoupled from the second pole port of the MTMEMS before decoupling the second pole port from a selectively coupled throw port of the MTMEMS.

Abstract: A first RF receive diplexer, which includes a first hybrid RF coupler, a second hybrid RF coupler, and RF filter circuitry, is disclosed. The first hybrid RF coupler has a first main port, a first pair of quadrature ports, and a first isolation port, which is coupled to an RF antenna. The second hybrid RF coupler has a second main port and a second pair of quadrature ports. The RF filter circuitry is coupled between the first pair of quadrature ports and the second pair of quadrature ports. The first RF receive diplexer receives a first adjunct RF antenna receive signal via the first isolation port to provide a first adjunct RF receive signal via the second main port. The first RF receive diplexer receives a first RF transmit signal via the first main port to provide a first RF antenna transmit signal via the first isolation port.

Abstract: This disclosure relates to radio frequency (RF) front end circuitry for portable communication devices. In one embodiment, the RF front end circuitry includes an antenna, a switchable receive path configured to be opened and to be closed, a coaxial cable, and a low noise amplifier (LNA). The LNA is coupled so as to drive the coaxial cable. Thus, when the switchable receive path is closed, an RF receive signal received by the antenna can propagate through the switchable receive path to the LNA. Since the LNA is driving the coaxial cable, the RF receive signal can propagate through the coaxial cable without being excessively degraded. In this manner, embodiments of the RF front end circuitry can be utilized to provide antenna swapping and RF transceiver circuitry coupled to the coaxial cable can receive the RF receive signal from the coaxial cable without excessive degradation.

Abstract: An amplifier having improved linearity is disclosed. The amplifier includes a main transistor having a first current input terminal, a first current output terminal, and a first control terminal coupled to an RF input terminal that receives a signal voltage. A cascode transistor has a second current input terminal coupled to an RF output terminal for outputting an amplified signal. The cascode transistor has a second control terminal, and a second current output terminal coupled to the first current input terminal. Linearization circuitry has a bias output terminal coupled to the second control terminal. The linearization circuitry is configured to generate a bias signal at the bias output terminal to maintain a quiescent point of the main transistor for a given load coupled to the RF output terminal such that output conductance of the main transistor decreases nonlinearly with increasing main voltage and increases nonlinearly with decreasing main voltage.

Abstract: Embodiments of the disclosure relate to a frequency selective low noise amplifier (LNA) circuit, which includes a transconductive LNA(s). In one aspect, filter circuitry is provided in a degeneration path of a transconductive LNA(s) to pass in-band frequencies and reject out-of-band frequencies by generating low impedance and high impedance at the in-band frequencies and the out-of-band frequencies, respectively. However, having the filter circuitry in the degeneration path may cause instability in the transconductive LNA. As such, a feedback path is coupled between an input node of the transconductive LNA(s) and the degeneration path to provide a feedback to improve stability of the transconductive LNA(s). In addition, the feedback can help improve impedance match in the frequency selective LNA circuit. As a result, the transconductive LNA(s) is able to achieve improved noise figure (NF) (e.g., below 1.5 dB), return loss, linearity, and stability, without compromising LNA gain.

Abstract: Embodiments of a tunable radio frequency (RF) diplexer and methods of operating the same are disclosed. In one embodiment, the RF diplexer includes a first hybrid coupler, a second hybrid coupler, an RF filter circuit, and a phase inversion component. Both the RF filter circuit and the phase inversion component are connected between the first hybrid coupler and the second hybrid coupler. The phase inversion component is configured to provide approximately a differential phase. The RF filter circuit is configured to provide a passband and a notch. The RF filter circuit is tunable to provide the notch on both a high-frequency side of the passband and a low frequency side of the passband. Accordingly, the tunable RF diplexer provides lower insertion losses and higher isolation regardless of whether the one of the diplexed frequency bands is set at higher frequencies or lower frequencies than the other diplexed frequency band.

Abstract: RF circuitry, which includes a first hybrid RF coupler, a second hybrid RF coupler, a third hybrid RF coupler, and RF filter circuitry, is disclosed. The first hybrid RF coupler provides a first main port, a first pair of quadrature ports, and an isolation port. The second hybrid RF coupler provides a second main port and a second pair of quadrature ports. The third hybrid RF coupler provides a third main port and a third pair of quadrature ports. RF filter circuitry is coupled to the first pair of quadrature ports, the second pair of quadrature ports, and the third pair of quadrature ports. The first main port, the second main port, and the third main port provide main ports of the RF triplexer. The isolation port is a common port of the RF triplexer for coupling to an RF antenna.

Abstract: RF filtering circuitry includes a first input/output node, a second input/output node, a common node, first filtering circuitry, second filtering circuitry, and transmit signal cancellation circuitry. The first filtering circuitry is coupled between the first input/output node and the common node, and is configured to pass RF transmit signals within one or more transmit signal frequency bands while attenuating signals outside the one or more transmit signal frequency bands. The second filtering circuitry is coupled between the second input/output node and the common node, and is configured to pass RF receive signals within one or more receive signal frequency bands while attenuating signals outside the one or more receive signal frequency bands. The transmit signal cancellation circuitry is coupled between the common node and the second input/output node and is configured to generate a transmit cancellation signal from the RF transmit signals.

Abstract: This disclosure relates generally to radio frequency (RF) front-end circuitry for routing RF signals to and/or from one or more antennas. Exemplary RF front-end circuitry includes a multiple throw solid-state transistor switch (MTSTS) and a multiple throw microelectromechanical switch (MTMEMS). The MTSTS may be configured to selectively couple a first pole port to any one of a first set of throw ports. The MTMEMS is configured to selectively couple a second pole port to any one of a second set of throw ports. The second pole port of the MTMEMS is coupled to a first throw port in the first set of throw ports of the MTSTS. The MTSTS helps prevent hot switching in the MTMEMS since the first throw port of the MTSTS may be decoupled from the second pole port of the MTMEMS before decoupling the second pole port from a selectively coupled throw port of the MTMEMS.

Abstract: Multiplexing circuitry is disclosed that includes filtering circuitry, which provides a first transfer function between a common port and a first port and a second transfer function between the common port and a second port. The first transfer function and second transfer function provide a first passband and a second passband, respectively. The first transfer function also has a stopband provided within the second passband of the second transfer function because the filtering circuitry includes a first filter path and a second filter path, wherein the second filter path has a first and second parallel resonant circuit provided in shunt with respect to the second filter path and weakly coupled to one another. The weak coupling between the first parallel resonant circuit and the second parallel resonant circuit naturally provides the stopband in the first transfer function within the second passband of the second transfer function.

Abstract: Radio frequency (RF) front end circuitry includes primary communications circuitry and secondary communications circuitry. The primary communications circuitry is configured to provide primary RF transmit signals and receive primary RF receive signals. The secondary communications circuitry is configured to provide primary RF transmit signals during certain uplink carrier aggregation configurations to provide antenna-to-antenna isolation between primary RF transmit signals and thus reduce intermodulation between signals in problematic operating band combinations.

Abstract: The present disclosure relates to coupled slow-wave transmission lines. In this regard, a transmission line structure is provided. The transmission line structure includes a first undulating signal path formed from first loop structures. The transmission line structure also includes a second undulating signal path formed from second loop structures. The second undulating signal path is disposed alongside of the first undulating signal path. Further, a first ground structure is disposed above or below either one or both of the first undulating signal path and the second undulating signal path.

Abstract: Embodiments of an apparatus are disclosed that includes a first three dimensional (3D) inductor and a second 3D inductor. The first three dimensional (3D) inductor has a first conductive path shaped as a first two dimensional (2D) lobe laid over a first 3D volume. In addition, the second 3D inductor has a second conductive path, wherein the second 3D inductor is inserted into the first 3D inductor so that the second conductive path at least partially extends through the first 3D volume. Since second 3D inductor is inserted into the first 3D inductor, the 3D inductors may be coupled to one another. Depending on orientation and distances of structures provided by the 3D inductors, the 3D inductors may be weakly or moderately coupled.

Abstract: The present disclosure relates to a slow-wave transmission line for transmitting slow-wave signals with reduced loss. In this regard, the slow-wave transmission line is formed in a multi-layer substrate and includes an undulating signal path. The undulating signal path includes at least two loop structures, wherein each loop structure includes at least two via structures connected by at least one intra-loop trace. The undulating signal path further includes at least one inter-loop trace connecting the at least two loop structures. Additionally, the slow-wave transmission line includes a first ground structure disposed along the undulating signal path. In this manner, a loop inductance is formed by each of the at least two loop structures, while a first distributed capacitance is formed between the undulating signal path and the ground structure.

Abstract: The present disclosure relates to a tunable slow-wave transmission line. The tunable slow-wave transmission line is formed in a multi-layer substrate and includes an undulating signal path. The undulating signal path includes at least two loop structures, wherein each loop structure includes at least two via structures connected by at least one intra-loop trace. The undulating signal path further includes at least one inter-loop trace connecting the at least two loop structures. The tunable slow-wave transmission line includes a first ground structure disposed along the undulating signal path. Further, the tunable slow-wave transmission line includes one or more circuits that may alter a signal transmitted in the tunable slow-wave transmission line so as to tune a frequency of the signal.

Abstract: An RF ladder filter having a parallel capacitance compensation circuit is disclosed. The parallel capacitance compensation circuit is made up of a first inductive element with a first T-terminal and a first end coupled to a first ladder terminal and a second inductive element with a second T-terminal that is coupled to the first T-terminal of the first inductive element and a second end coupled to a second ladder terminal. Further included is a compensating acoustic RF resonator (ARFR) having a fixed node terminal and a third T-terminal that is coupled to the first T-terminal of the first inductive element and the second T-terminal of the second inductive element, and a finite number of series-coupled ladder ARFRs, wherein the parallel capacitance compensation circuit is coupled across one of the finite number of series-coupled ARFRs by way of the first ladder terminal and the second ladder terminal.

Abstract: LNA circuitry includes an input node, and output node, a primary amplifier stage, a first ancillary amplifier stage, and an input gain selection switch. The primary amplifier stage is configured to provide a first gain response between a primary amplifier stage input node and a primary amplifier stage output node, wherein the primary amplifier stage input node is coupled to the input node and the primary amplifier stage output node is coupled to the output node. The first ancillary amplifier stage is configured to provide a second gain response between a first ancillary amplifier stage input node and a first ancillary amplifier stage output node, wherein the first ancillary amplifier stage output node is coupled to the primary amplifier stage output node. The input gain selection switch is coupled between the input node and the first ancillary amplifier stage input node.

Abstract: This disclosure relates generally to radio frequency (RF) front-end circuitry for routing RF signals to and/or from one or more antennas. Exemplary RF front-end circuitry includes a multiple throw solid-state transistor switch (MTSTS) and a multiple throw microelectromechanical switch (MTMEMS). The MTSTS may be configured to selectively couple a first pole port to any one of a first set of throw ports. The MTMEMS is configured to selectively couple a second pole port to any one of a second set of throw ports. The second pole port of the MTMEMS is coupled to a first throw port in the first set of throw ports of the MTSTS. The MTSTS helps prevent hot switching in the MTMEMS since the first throw port of the MTSTS may be decoupled from the second pole port of the MTMEMS before decoupling the second pole port from a selectively coupled throw port of the MTMEMS.

Abstract: RF circuitry, which includes a first passive voltage-gain network and a first MOS-based RF receive amplifier, is disclosed. The first passive voltage-gain network provides a first passive RF receive signal using a first RF receive signal, such that an energy of the first passive RF receive signal is obtained entirely from the first RF receive signal by the first passive voltage-gain network. A voltage of the first passive RF receive signal is greater than a voltage of the first RF receive signal. The first MOS-based RF receive amplifier receives and amplifies the first passive RF receive signal to provide a first amplified RF receive signal.