Abstract: A power amplifier circuit includes an amplifier that receives an input signal with an alternating current and outputs an output signal obtained by amplifying power of the input signal to a first node; an inductive element that is connected between the first node and a second node; and a variable capacitor that is connected between the second node and a reference potential, and whose electrostatic capacitance increases as power of the output signal increases.

Abstract: A communication device may execute a specific wireless communication of object data via a first wireless network with a mobile device using a second type of interface after executing a specific process of sending a first wireless setting for causing the mobile device to belong to the first wireless network using a first type of interface in a first case where the communication device operates in a first state which is a parent station state or a child station state in the first wireless network and execute the specific wireless communication of the object data with the mobile device using the second type of interface after executing another process different from the specific process in a second case where the communication device operates in a second state which is different from the first state.

Abstract: A high-frequency module includes a transmission signal amplifier that outputs a transmission signal to an antenna terminal side; a reception signal amplifier that amplifies a reception signal supplied from an antenna terminal; a switch that selectively connects the antenna terminal to either an output of the transmission signal amplifier or an input of the reception signal amplifier; and a directional coupler that is provided on a transmission signal path and detects a signal level of the transmission signal. The transmission signal amplifier is controlled by a first control signal supplied from a first control circuit. The reception signal amplifier is controlled by a second control signal supplied from a second control circuit. The switch is controlled by a switch control signal supplied from the first control circuit. The directional coupler is controlled by a coupler control signal supplied from the first control circuit.

Abstract: A power amplifier circuit includes a first amplification element having an output terminal and amplifying a harmonic signal input to an input terminal, a second amplification element having an output terminal and amplifying a harmonic signal input to an input terminal, a bias circuit that supplies a bias to each of the input terminal of the first amplification element and the second amplification element, a first resistance element electrically connected to the output terminal of the first amplification element, and a second resistance element electrically connected to the output terminal of the second amplification element and electrically connected to the other end of the first resistance element in series, the bias circuit is electrically connected to a connection point in a portion in which the other end of the first resistance element and the other end of the second resistance element are electrically connected in series.

Abstract: A steering device according to one aspect of the disclosure includes: a speed reducer configured to decelerate a rotational power input from one surface side while increasing a torque and output rotation from an output section disposed on the other surface side; a motor provided on the one surface side and configured to input the rotational power to the speed reducer; and a control device for controlling the motor. The motor includes a rotor for generating the rotational power. The rotor includes a rotor output shaft disposed coaxially with an output axis of the output section. The motor inputs the rotational power from one end side of the rotor output shaft to the speed reducer. The control device is disposed on the other end side of the rotor output shaft coaxially with the rotor output shaft and includes a sensing unit for sensing rotation of the rotor.

Abstract: A connector is provided which has a connector main body and a reinforcement fitting attached to the connector main body. The reinforcement fitting contains an upper surface part covering at least a portion of an upper surface of a mating guide part of the connector main body, an end surface part covering a portion of an end surface of the mating guiding part, a first side surface part covering a portion of each side surface of the mating guiding part, and a second side surface part covering a portion of each side surface of the guiding part. The end surface part is connected to the upper surface part, the first side surface part is connected to the upper surface part, and the second side surface part is positioned closer to the end surface of the guiding part than the first side surface part and is connected to the end surface part.

Abstract: A power amplifier circuit includes a first transistor having an emitter electrically connected to a common potential, a base to which a first high-frequency signal is input, and a collector from which a third high-frequency signal is output; a second transistor having an emitter electrically connected to the common potential, a base to which a second high-frequency signal is input, and a collector from which a fourth high-frequency signal is output; a first capacitance circuit electrically connected between the collector of the second transistor and the base of the first transistor; and a second capacitance circuit electrically connected between the collector of the first transistor and the base of the second transistor.

Abstract: A high-frequency signal processing apparatus and a wireless communication apparatus can achieve a decrease in power consumption. For example, when an indicated power level to a high-frequency power amplifier is equal to or greater than a second reference value, envelope tracking is performed by causing a source voltage control circuit to control a high-speed DCDC converter using a detection result of an envelope detecting circuit and causing a bias control circuit to indicate a fixed bias value. The source voltage control circuit and the bias control circuit indicate a source voltage and a bias value decreasing in proportion to a decrease in the indicated power level when the indicated power level is in a range of the second reference value to the first reference value, and indicate a fixed source voltage and a fixed bias value when the indicated power level is less than the first reference value.

Abstract: A filter device includes a first filter including a first input terminal, a first output terminal, a first series arm including first series arm resonators, and first parallel arms connected to the first series arm and each including a first parallel arm resonator, the first filter having a pass band in a predetermined frequency band, a second filter including a second input terminal, a second output terminal, a second series arm including second series arm resonators, and second parallel arms connected to the second series arm and each including a second parallel arm resonator, the second filter having a pass band in the predetermined frequency band, a substrate including the first and second filters, and an inductor connected between a ground terminal and a parallel arm resonator included in at least one parallel arm of the first and second parallel arms.

Abstract: A function executing device is configured to send a wireless identifier to a communication device via a first type of wireless communication interface for setting up a wireless connection. The function executing device is configured to determine whether the function executing device is in an error state and, if not, to establish the wireless connection via a second type of wireless communication interface. The function executing device operates in a parent state in the wireless connection. Additionally, print data may be received from the communication device. However, if the function executing device is in an error state the wireless connection is not established via the second type of wireless communication interface.

Abstract: A power amplifier circuit includes: a power splitter; a first amplifier; a second amplifier; a first balun that splits a first amplified signal into a third amplified signal and a fourth amplified signal having a different phase from the third amplified signal; a third amplifier and a fourth amplifier that respectively amplify the third amplified signal and the fourth amplified signal; a second balun that splits a second amplified signal into a fifth amplified signal and a sixth amplified signal having a different phase from the fifth amplified signal; a fifth amplifier that amplifies the fifth amplified signal if a power level of the fifth amplified signal is equal to or higher than a predetermined power level; and a sixth amplifier that amplifies the sixth amplified signal if a power level of the sixth amplified signal is equal to or higher than a predetermined power level.

Abstract: A measurement apparatus which measures a relative positional displacement amount of a partial pattern to another pattern in a complex pattern on a surface of an object, includes: a measurement part to measure two-dimensional intensity distributions having a first and a second two-dimensional intensity distribution, the first distribution being formed by applying first light having a first shape to a region on which the complex pattern is measured and detecting only zero order diffraction light from the region via a first filter, and the second distribution being formed by applying second light having a second shape to the region and detecting only zero order diffraction light from the region via a second filter; a storage part to store measurement data indicating the distributions; and a calculation part to form a synthesized intensity distribution obtained by the two-dimensional intensity distributions to calculate a positional displacement amount of the partial pattern.

Abstract: Provided are a power amplifier circuit and a communication device that improve a power handling capability required for a filter while increasing output power. A power amplifier circuit includes: an amplifier unit that amplifies an input signal of a time division duplex scheme and outputs a signal to a signal path and a signal to a signal path; a filter that is provided in the signal path and outputs a signal based on the signal; a filter that is provided in the signal path and outputs a signal based on the signal; and a transformer that is connected to the signal path through the filter and connected to the signal path through the filter and outputs an output signal based on the signal and the signal to a signal path.

Abstract: Provided are a multilayer film having excellent gas permeability and excellent handling properties and hence is suited for forming a cell culture container, and a cell culture container formed by using the same. A multilayer film used for forming a cell culture container, comprising: a base material composed of a polyethylene-based resin having a density of 0.87 g/cm3 to 0.90 g/cm3; and an inner layer composed of a polyethylene-based resin having a density of 0.896 g/cm3 to 0.93 g/cm3 and forming a cell culture icy surface. A cell culture container is formed by using this multilayer film.

Abstract: A power amplifier circuit includes a power splitter, a first amplifier, a second amplifier, a third amplifier, a fourth amplifier, a first bias circuit, a first line connecting the first bias circuit and the first amplifier, and a second line connecting the first bias circuit and the third amplifier on the same semiconductor substrate, in which the first line and the second line are formed such that a voltage drop amount of the first bias voltage between the first bias circuit and the first amplifier is substantially equal to a voltage drop amount of the first bias voltage between the first bias circuit and the third amplifier.

Abstract: A radio-frequency circuit is used in simultaneous transfer of a radio-frequency signal of 4G and a radio-frequency signal of 5G, and includes a first transfer circuit that selectively receives the 4G radio-frequency signal or the 5G radio-frequency signal, and transfers a radio-frequency signal of a first communication band including a first transmission band and a first reception band and a radio-frequency signal of a second communication band including a second transmission band and a second reception band. The first and second transmission bands at least partially overlap. The first transfer circuit includes a first power amplifier that amplifies transmission signals of the first and second communication bands, and a first transmission filter that has a first passband including the first and second transmission bands, and passes the transmission signals of the first and second communication bands output from the first power amplifier.

Abstract: A high-frequency signal processing apparatus and a wireless communication apparatus can achieve a decrease in power consumption. For example, when an indicated power level to a high-frequency power amplifier is equal to or greater than a second reference value, envelope tracking is performed by causing a source voltage control circuit to control a high-speed DCDC converter using a detection result of an envelope detecting circuit and causing a bias control circuit to indicate a fixed bias value. The source voltage control circuit and the bias control circuit indicate a source voltage and a bias value decreasing in proportion to a decrease in the indicated power level when the indicated power level is in a range of the second reference value to the first reference value, and indicate a fixed source voltage and a fixed bias value when the indicated power level is less than the first reference value.

Abstract: A communication device may include a first type of interface and a second type of interface. The communication device may execute the communication of object data with a mobile device using the second type of interface after executing a specific process for causing the communication device to shift to a communication-enabled state, in a case where it is determined that the communication device is not currently in the communication-enabled state. Also, the communication device may execute the communication of the object data with the mobile device using the second type of interface without executing the specific process, in a case where it is determined that the communication device is currently in the communication-enabled state.

Abstract: A power amplifier circuit includes a substrate and a semiconductor chip disposed on or above the substrate. The semiconductor chip includes a power amplifier unit that amplifies an RF signal, a ground terminal to which a ground of the power amplifier unit is coupled, and a first circuit element having a first end electrically coupled to the ground terminal without any portion outside the semiconductor chip interposed therebetween, and having a second end. The substrate includes a second circuit element having a first end electrically coupled to an output of the power amplifier unit and a second end electrically coupled to the second end of the first circuit element. The first and second circuit elements constitute a harmonic wave termination circuit. The harmonic wave termination circuit reflects, to the power amplifier unit, a harmonic wave component of the amplified RF signal output from the power amplifier unit.

Abstract: A method for manufacturing an optical fiber preform including a core part and a cladding part is disclosed. The method includes: adding an alkali metal to an inner surface of a silica-based glass pipe; etching the inner surface of the silica-based glass pipe to which the alkali metal is added; making a glass rod by collapsing the silica-based glass pipe after the etching; and making an optical fiber preform using the glass rod. The silica-based glass pipe is heated in the adding such that a surface temperature of the silica-based glass pipe falls within a temperature range of 1500° C. or higher to lower than 2000° C.