Abstract: An acoustic wave device includes an acoustic wave filter configured to filter a radio frequency signal and a loop circuit coupled to the acoustic wave filter. The loop circuit is configured to generate an anti-phase signal to a target signal at a particular frequency. The loop circuit includes a Lamb wave resonator having a piezoelectric layer and an interdigital transducer electrode disposed on the piezoelectric layer. The piezoelectric layer includes free edges. An edge of the piezoelectric layer is configured to one of suppress or scatter reflections of acoustic waves generated by the interdigital transducer electrode from the edge of the piezoelectric layer.

Abstract: In some embodiments, a system can include a first arbiter device connected to a first network, the first arbiter device communicating with a first communication interval, a second arbiter device connected to a second network, the second arbiter device communicating with a second communication interval synchronized with the first communication interval; and a wireless network architecture that desynchronizes the first communication interval and the second communication interval.

Abstract: Aspects of this disclosure relate to an acoustic wave resonator with a patterned conductive layer. The acoustic wave resonator can include a piezoelectric layer, an interdigital transducer electrode over the piezoelectric layer, and a temperature compensation layer over the interdigital transducer electrode. The interdigital transducer electrode can include a bus bar and fingers extending from the bus bar. The fingers can each include an edge portion and a body portion. The patterned conductive layer can overlap the edge portions of the fingers. The patterned conductive layer can conductive portions that are spaced apart from each other. A portion of the temperature compensation layer can be positioned between the patterned conductive layer and the interdigital transducer electrode.

Abstract: Aspects of this disclosure relate to a method for making an acoustic wave resonator with hyperbolic mode suppression. The acoustic wave resonator can include a piezoelectric layer, an interdigital transducer electrode, a temperature compensation layer, and a mass loading strip. The mass loading strip can be a conductive strip. The mass loading strip can overlap edge portions of fingers of the interdigital transducer electrode. A layer of the mass loading strip can have a density that is at least as high as a density of a material of the interdigital transducer electrode. The material of the interdigital transducer can impact acoustic properties of the acoustic wave resonator.

Abstract: Ultrahigh band (UHB) architectures for radio frequency (RF) front-ends are disclosed. In certain embodiments, an RF front-end for a mobile device includes a first ultrahigh band transmit/receive module connected to a first antenna, a second ultrahigh band transmit/receive module connected to the first antenna, and a first ultrahigh band receive module connected to a second antenna. The first ultrahigh band transmit/receive module is further connected to the second antenna by way of an auxiliary input of the first ultrahigh band receive module.

Abstract: Disclosed herein are embodiments of low temperature co-fireable dielectric materials which can be used in conjunction with high dielectric materials to form composite structures, in particular for isolators and circulators for radiofrequency components. Embodiments of the low temperature co-fireable dielectric materials can be scheelite or garnet structures, for example barium tungstate. Adhesives and/or glue is not necessary for the formation of the isolators and circulators.

Abstract: Power amplifier modules with controllable envelope tracking noise filters are provided herein. In certain embodiments, an envelope tracking system includes a power amplifier module and an envelope tracker that provides the power amplifier module with a power amplifier supply voltage that changes based on an envelope of a radio frequency (RF) signal amplified by the power amplifier module. The power amplifier module includes a controllable filter that filters the power amplifier supply voltage to provide flexibility in filtering envelope tracking noise.

Abstract: A method for protecting a system including a driver integrated circuit includes receiving a driver input signal. The method includes driving an output signal externally to the driver integrated circuit. The output signal is driven based on the driver input signal and an indication of a delay between receipt of an edge of the driver input signal and arrival of a corresponding edge of the output signal at an output node coupled to a terminal of the driver integrated circuit.

Abstract: A power amplifier module can be formed that includes metamaterial matching circuits. This power amplifier module can be included as part of a front-end module of a wireless device. The front-end module can replace a passive duplexer with an active duplexer that uses the power amplifier module in combination with a low noise amplifier circuit that can include a metamaterial matching circuit. The combination of PA and LNA circuits that utilize metamaterials can provide the functionality of a duplexer without including a stand-alone or passive duplexer. Thus, in certain cases, the front-end module can provide duplexer functionality without including a separate duplexer. Advantageously, in certain cases, the size of the front-end module can be reduced by eliminating the passive duplexer. Further, the loss introduced into the signal path by the passive duplexer is eliminated improving the performance of the communication system that includes the active duplexer.

Abstract: This disclosure relates to bipolar transistors, such as heterojunction bipolar transistors, having increased collector thickness for improved ruggedness. In some embodiments, the collector thickness can be above 1.1 microns. The collector can have at least one doping concentration grading. The collector can have a high doping concentration at a junction between the collector and the sub-collector, such as at the high end of the grading. In some embodiments, the high doping concentration can be above about 9×1016 cm?3. The collector can include a region with high doping concentration adjacent the base. The collector can include a discontinuity in the doping concentration, such as at the low end of the grading. Such bipolar transistors can be implemented, for example, in power amplifiers.

Abstract: A wireless device comprising a first antenna and second antenna, a transceiver and a radio frequency front end system electrically coupled between the transceiver and the antennas. The RF front end system includes a first module operable to provide a high band transmit signal to the first antenna, receive a first high band receive signal and a first mid band receive signal from the first antenna. The first high band receive signal has a frequency range greater than that of the first mid band receive signal. The RF front end system further includes a second module operable to provide a mid band transmit signal to the second antenna, receive a second mid band receive signal and a second high band receive signal from the second antenna. The second high band receive signal has a frequency range greater than that of the second mid band receive signal.

Abstract: A method of forming an integrated microstrip circulator includes translating a ferrite disc into an aperture in a dielectric substrate, securing the ferrite disc in the dielectric substrate with an adhesive to form a composite structure, and forming circuitry on an upper surface of the composite structure and forming surface mount contacts on a lower surface of the composite structure by metallizing the upper and lower surfaces of the composite structure.

Abstract: A power management integrated circuit (PMIC) can improve the ramp up speed of a boost converter with the inclusion of a controllable switch that may modify the connection of an output capacitor to reduce the ramp time as the output voltage is ramping to a desired boost setpoint. The switch may be controlled using jump start logic to switch a first plate or terminal of the output capacitor from a ground connection to a voltage supply connection. Once a threshold voltage is reached, the first plate of the capacitor may be switched from the supply voltage to ground. In certain cases, by switching the connection of the output capacitor between ground and a supply voltage based on one or more threshold voltages or a boost setpoint, the time to ramp from an initial voltage to a desired boost setpoint may be reduced.

Abstract: A method for calibrating an isolator product includes receiving a calibration signal on a differential pair of nodes of a receiver signal path of a first integrated circuit die of the isolator product. The method includes generating a diagnostic signal having a level corresponding to an average amplitude of the calibration signal on the differential pair of nodes. The method includes configuring a programmable receiver signal path based on the diagnostic signal. Generating the diagnostic signal may include providing an analog signal based on a full-wave rectified version of the calibration signal on the differential pair of nodes. Generating the diagnostic signal may include converting the analog signal to a digital signal.

Abstract: A switching circuit can include a first cellular filter, a second cellular filter, a first Wi-Fi filter, a second Wi-Fi filter and a plurality of switches. The first cellular filter can filter a first cellular frequency band. The second cellular filter can filter a second cellular frequency band. The first Wi-Fi filter can filter a first Wi-Fi frequency band. The first Wi-Fi frequency band is positioned between the first and the second cellular frequency bands. The second Wi-Fi filter can filter a second Wi-Fi frequency band. The second Wi-Fi frequency band is positioned between the second cellular frequency band and the first Wi-Fi frequency band. A plurality of switches can route signal from an antenna through the first cellular filter and the second Wi-Fi filter or route the signal from the antenna through the second cellular filter and the first Wi-Fi filter.

Abstract: Mobile devices with a merged Frequency Range 1 (FR1) and intermediate frequency (IF) path for frequency range 2 (FR2) are disclosed. In certain embodiments, a mobile device includes a transceiver including a shared transmit channel that generates an FR1 transmit signal and an IF transmit signal. The mobile device further includes a first antenna and an FR1 front end system coupled to the transceiver and operable to transmit the FR1 transmit signal on the first antenna. The mobile device further includes a second antenna and an FR2 front end system coupled to the transceiver and operable to upconvert the IF transmit signal to generate an FR2 transmit signal, and to transmit the FR2 transmit signal on the second antenna.

Abstract: A microelectromechanical system microphone includes a piezoelectric diaphragm, upper inner electrodes and upper outer electrodes disposed on an upper surface of the diaphragm, and lower inner electrodes and lower outer electrodes disposed on a lower surface of the diaphragm. The diaphragm is divided into a plurality of sectors, a first of the sectors including an inner and an outer upper electrode physically disconnected from an inner and an outer upper electrode on a second sector adjacent to the first sector, and an inner and an outer lower electrode physically disconnected from an inner and an outer lower electrode on the second sector. A first via extends between and electrically couples the upper and lower inner electrodes of the first sector and a first bond pad. A second via extends between and electrically couples the upper and lower outer electrodes of the second sector and a second bond pad.

Abstract: Disclosed is an acoustic wave resonator comprising a substrate material formed of aluminum nitride (AlN) doped with one or more of beryllium (Be), strontium (Sr), and sodium (Na) to enhance performance of the acoustic wave resonator.

Abstract: Cellular radios employing multiple power amplifiers for legacy communications are disclosed herein. In certain embodiments, a mobile phone includes a first antenna, a second antenna, and an RFFE including a first transmit path operable to transmit a first RF signal on the first antenna using a first communication standard in a first mode, and a second transmit path operable to transmit a second RF signal on the second antenna using the first communication standard in the first mode. Furthermore, in a second mode the RFFE is implemented to reuse the first transmit path and the second transmit path to synchronously transmit a third RF signal on the first antenna and the second antenna using a second communication standard.

Abstract: Apparatus and methods for power amplifier power management are disclosed. In certain embodiments, a mobile device includes a transceiver that generates a radio frequency signal, a front-end system including a first power amplifier module that amplifies the radio frequency signal, and a power management system including an envelope tracking power management unit that provides an envelope tracking supply voltage to the first power amplifier module, and a first average power tracking power management unit that provides an average power tracking supply voltage to the first power amplifier module. The first power amplifier module is configured to selectively switch between the envelope tracking supply voltage and the average power tracking supply voltage.