Systems and apparatuses are disclosed that include a modular power amplifier having a power amplifier subsystem with a first 90 degree hybrid block configured to receive an RF signal and output a split RF signal with components having a 90 degree phase shift, a second 90 degree hybrid block configured to receive and combine the split RF signal by removing the 90 degree phase shift, a high-power amplifier configured to amplify at least one of the components of the split RF signal. The modular power amplifier also includes a power distribution module configured to regulate an amount of power input to the high-power amplifier and a power sequencer configured to control the timing of power delivery by the power distribution module. Three-dimensional power amplifiers having a first high-power amplifier and a second high-power amplifier having different orientations causing a reduction in electromagnetic interference are also disclosed.

A radio frequency module includes a mount board, an acoustic wave filter, a temperature sensor, and a correction circuit. The mount board has a first principal surface and a second principal surface on opposite sides of the mount board. The acoustic wave filter is disposed on the first principal surface side of the mount board. The temperature sensor is disposed on the second principal surface side of the mount board. The correction circuit corrects a pass band of the acoustic wave filter in accordance with a temperature measured by the temperature sensor.

Modified forms of hemagglutinin (HA) protein including those with modified immunodominant regions and with modified maturation cleavage sites, and virus and virus-like particles containing them are disclosed.

Modified forms of hemagglutinin (HA) protein including those with modified immunodominant regions and with modified maturation cleavage sites, and virus and virus-like particles containing them are disclosed.

A radio frequency module includes a switch circuit that includes selection terminals, a filter that allows the signal in the first frequency band to pass therethrough, a filter that allows the signal in the second frequency band to pass therethrough, a phase adjustment circuit that is connected to the selection terminal and the filter, and a phase adjustment circuit that is connected to the selection terminal and the filter. The filter includes an acoustic wave resonator that is formed on a substrate that has piezoelectricity. The filter includes an acoustic wave resonator that is formed on a substrate that has piezoelectricity. At least one of circuit elements that are included in the phase adjustment circuit is formed on the substrate. At least one of circuit elements that are included in the phase adjustment circuit is formed on the substrate.

A radio frequency module includes a switch circuit that includes selection terminals, a filter that allows the signal in the first frequency band to pass therethrough, a filter that allows the signal in the second frequency band to pass therethrough, a phase adjustment circuit that is connected to the selection terminal and the filter, and a phase adjustment circuit that is connected to the selection terminal and the filter. The filter includes an acoustic wave resonator that is formed on a substrate that has piezoelectricity. The filter includes an acoustic wave resonator that is formed on a substrate that has piezoelectricity. At least one of circuit elements that are included in the phase adjustment circuit is formed on the substrate. At least one of circuit elements that are included in the phase adjustment circuit is formed on the substrate.

An amplifier may comprise first and second matching networks; first and second transistors; and a transformer including first to third inductors. Also, a gate and a source of the first transistor are connected to the first matching network, one end of the first inductor is connected to a drain of the first transistor, the other end of the first inductor is connected to a source of the second transistor, one end of the second inductor is connected to a gate of the second transistor, the other end of the second inductor is grounded, one end of the third inductor is connected to a drain of the second transistor, and the other end of the third inductor is connected to the second matching network.

An amplifier may comprise first and second matching networks; first and second transistors; and a transformer including first to third inductors. Also, a gate and a source of the first transistor are connected to the first matching network, one end of the first inductor is connected to a drain of the first transistor, the other end of the first inductor is connected to a source of the second transistor, one end of the second inductor is connected to a gate of the second transistor, the other end of the second inductor is grounded, one end of the third inductor is connected to a drain of the second transistor, and the other end of the third inductor is connected to the second matching network.

An apparatus includes: a transistor including an input terminal for an input signal and an output terminal for an output signal; a matching circuit configured to match a load impedance regarding a fundamental harmonic of at least one of the input signal and the output signal to an impedance of the transistor and include a first conductive film being laminated over the transistor and coupled to at least one of the input terminal and the output terminal; and a processing circuit configured to adjust an impedance regarding a harmonic of at least one of the input signal and the output signal and include a second conductive film being laminated over the first conductive film and coupled to at least one of the input terminal and the output terminal through a via which penetrates through a dielectric layer sandwiched between the first conductive film and the second conductive film.

An average power tracking (APT) power management circuit is provided. The APT power management circuit is configured to generate a first APT voltage(s) for a first power amplifier(s) and a second APT voltage(s) for a second power amplifier(s). The APT power management circuit further includes a pair of switcher circuits that can generate a pair of reference voltages. Depending on various operating scenarios of the APT power management circuit, it is possible to selectively output any of the reference voltages as any one or more of the first APT voltage(s) and the second APT voltage(s). As such, it is possible to flexibly configure the APT power management circuit to support the various operating scenarios based on a minimum possible number of the switcher circuits, thus helping to reduce footprint and cost of the APT power management circuit.