Abstract: An amplification circuit includes an amplification transistor connected to a signal input terminal, a power supply circuit configured to supply a bias voltage to the amplification transistor, a resistor disposed in series to a bias path connecting the power supply circuit and the amplification transistor, a transistor that is connected to the bias path and the power supply circuit and that is a simulated transistor for the amplification transistor, and a detection diode connected to the signal input terminal and the bias path between the resistor and a gate of the amplification transistor.

Abstract: The laminate of the present disclosure is a laminate including multiple glass ceramic layers each containing quartz and a glass that contains SiO2, B2O3, Al2O3, and M2O, where M is an alkali metal. An Al2O3 content of a surface layer portion of the laminate is higher than an Al2O3 content of an inner layer portion of the laminate, and a M2O content of the surface layer portion is lower than a M2O content of the inner layer portion.

Abstract: The laminate of the present disclosure includes multiple glass ceramic layers each containing quartz and a glass that contains SiO2, B2O3, Al2O3, and M2O, where M is an alkali metal. The B concentration of a surface layer portion of the laminate is lower than the B concentration of an inner layer portion of the laminate.

Abstract: The glass ceramic material of the present disclosure contains a glass that contains SiO2, B2O3, Al2O3, and M2O, where M is an alkali metal, and a filler that contains quartz, Al2O3, and ZrO2. The glass ceramic material contains the glass in an amount of 57.4% by weight or more and 67.4% by weight or less, the quartz in the filler in an amount of 29% by weight or more and 39% by weight or less, the Al2O3 in the filler in an amount of 1.8% by weight or more and 5% by weight or less, and the ZrO2 in the filler in an amount of 0.3% by weight or more and 1.8% by weight or less.

Abstract: A glass ceramic that contains a glass containing Si, B, Al, and Zn and aggregates. The glass has a SiO2 content of 20% by weight to 55% by weight, a B2O3 content of 15% by weight to 30% by weight, Al2O3, and ZnO, wherein a weight ratio of the SiO2 to the B2O3 (SiO2/B2O3) is 1.21 or higher, and a weight ratio of the Al2O3 to the ZnO (Al2O3/ZnO) is 0.8 to 1.3. A TiO2 content, a ZrO2 content, a SnO2 content, and a Sr0 content in the glass each are 0% by weight to 5% by weight. The aggregates include 20% by weight to 50% by weight of SiO2, 1% by weight to 10% by weight of TiO2, 3% by weight or less of ZrO2, and 1% by weight or less of ZnO each relative to the weight of the glass ceramic.

Abstract: A glass that contains Si, B, Al, and Zn. The glass has SiO2 at a content of 15% by weight to 65% by weight, B2O3 at a content of 11% by weight to 30% by weight, Al2O3, and ZnO, wherein a weight ratio of the SiO2 to the B2O3 (SiO2/B2O3) is 1.21 or higher, and a weight ratio of the Al2O3 to the ZnO (Al2O3/ZnO) is 0.75 to 1.64, and wherein an alkaline-earth metal is excluded as a material contained in the glass.

Abstract: An amplifier unit includes an amplifier, a bias circuit, an inductor, a variable resistor circuit, and a control circuit. The amplifier includes an amplifier transistor that amplifies an input radio-frequency signal. The bias circuit is connected to the amplifier. The inductor is connected between and in series with the amplifier and the bias circuit. The variable resistor circuit is connected to the inductor. The control circuit includes a measuring circuit and a comparison circuit. The measuring circuit measures an amplification characteristic value of the amplifier transistor. The comparison circuit compares the amplification characteristic value measured by the measuring circuit with a reference value. The control circuit controls the variable resistor circuit based on a comparison result of the comparison circuit.

Abstract: An active material includes, as constituent elements, silicon, oxygen, a first element, a second element, and a third element. The first element includes boron, phosphorus, or both. The second element includes at least one of an alkali metal element, a transition element, or a typical element. The typical element excludes silicon, oxygen, boron, phosphorus, an alkali metal element, and an alkaline earth metal element. The third element includes an alkaline earth metal element. The content of silicon with respect to all the constituent elements excluding oxygen and carbon is 60 at % or greater and 98 at % or less. The content of the first element with respect to all the constituent elements excluding oxygen and carbon is 1 at % or greater and 25 at % or less. The content of the second element with respect to all the constituent elements excluding oxygen and carbon is 1 at % or greater and 34 at % or less.

Abstract: An amplifier circuit includes an input terminal to which a radio frequency signal is input, an amplifier transistor that has a control terminal and amplifies the radio frequency signal, a bias circuit that includes an emitter-follower circuit or a source-follower circuit and supplies a bias current to the control terminal of the amplifier transistor, an inductor arranged in series between an emitter of the emitter-follower circuit and the control terminal of the amplifier transistor or between a source of the source-follower circuit and the control terminal of the amplifier transistor, and a variable resistance circuit connected to the inductor.

Abstract: The laminate of the present disclosure is a laminate including multiple glass ceramic layers each containing quartz and a glass that contains SiO2, B2O3, Al2O3, and M2O, where M is an alkali metal. An Al2O3 content of a surface layer portion of the laminate is higher than an Al2O3 content of an inner layer portion of the laminate, and a M2O content of the surface layer portion is lower than a M2O content of the inner layer portion.

Abstract: The glass ceramic material of the present disclosure contains a glass that contains SiO2, B2O3, Al2O3, and M2O, where M is an alkali metal, and a filler that contains quartz, Al2O3, and ZrO2. The glass ceramic material contains the glass in an amount of 57.4% by weight or more and 67.4% by weight or less, the quartz in the filler in an amount of 29% by weight or more and 39% by weight or less, the Al2O3 in the filler in an amount of 1.8% by weight or more and 5% by weight or less, and the ZrO2 in the filler in an amount of 0.3% by weight or more and 1.8% by weight or less.

Abstract: A temperature detection circuit (1) includes a first transistor (Q1) of a bipolar type, and a second transistor (Q2) of a bipolar type, wherein the first transistor (Q1) and the second transistor (Q2) form a current mirror circuit (10), and the temperature of the amplifier circuit (30) is detected based on a temperature change of the first transistor (Q1) and the second transistor (Q2).

Abstract: The laminate of the present disclosure includes multiple glass ceramic layers each containing quartz and a glass that contains SiO2, B2O3, Al2O3, and M2O, where M is an alkali metal. The B concentration of a surface layer portion of the laminate is lower than the B concentration of an inner layer portion of the laminate.

Abstract: A power module includes a power wiring line provided with a power element, a glass ceramic multilayer substrate provided with a control element to control the power element, and a highly heat-conductive ceramic substrate made of a ceramic material having higher thermal conductivity than a glass ceramic contained in the glass ceramic multilayer substrate. The power wiring line is disposed on the highly heat-conductive ceramic substrate, and the glass ceramic multilayer substrate is disposed directly on the highly heat-conductive ceramic substrate.

Abstract: A composite ceramic multilayer substrate includes a glass ceramic insulating layer including a wiring layer and a highly thermally conductive ceramic insulating layer made of a ceramic material having a higher thermal conductivity than the glass ceramic insulating layer. The glass ceramic insulating layer is provided on at least one main surface of the highly thermally conductive ceramic insulating layer directly and/or with a wiring layer interposed therebetween. When viewed in a direction perpendicular or substantially perpendicular to a main surface of the composite ceramic multilayer substrate, the composite ceramic multilayer substrate includes at least one heat generating element-mounting portion surrounded by the glass ceramic insulating layer and at which a heat generating element-mounting wiring line provide on the main surface of the highly thermally conductive ceramic insulating layer is exposed.

Abstract: An antenna module (100) includes a dielectric substrate (160) having a multilayer structure, a first radiation electrode (122), a second radiation electrode (121), and a ground electrode (GND). The second radiation electrode (121) is arranged between the first radiation electrode (122) and the ground electrode (GND) in a lamination direction of the dielectric substrate (160). In the dielectric substrate (160), a hollow portion (150) is disposed in at least a portion between the first radiation electrode (122) and the second radiation electrode (121).

Abstract: Provided is a detector circuit that includes: a first transistor that has an alternating current signal input to a base thereof, and that outputs a first detection signal that depends on the alternating current signal from a collector thereof; a second transistor that has the first detection signal input to a base thereof, and that outputs a second detection signal that depends on the first detection signal from a collector thereof; and an alternating current signal path along which the alternating current signal is supplied to the base of the second transistor.

Abstract: A mixed powder for a low temperature cofired ceramic material that contains 65 to 80 parts by weight of SiO2, 5 to 25 parts by weight of BaO, 1 to 10 parts by weight of Al2O3, 0.1 to 5 parts by weight of MnO, 0.1 to 5 parts by weight of B2O3, and 0.1 to less than 3 parts by weight of Li2O. The ceramic sintered body is used for, for example, ceramic electronic components, e.g., a multilayer circuit board or a coupler.

Abstract: Provided is a detector circuit that includes: a first transistor that has an alternating current signal input to a base thereof, and that outputs a first detection signal that depends on the alternating current signal from a collector thereof; a second transistor that has the first detection signal input to a base thereof, and that outputs a second detection signal that depends on the first detection signal from a collector thereof; and an alternating current signal path along which the alternating current signal is supplied to the base of the second transistor.

Abstract: Provided is a detector circuit that includes: a first transistor that has an alternating current signal input to a base thereof, and that outputs a first detection signal that depends on the alternating current signal from a collector thereof; a second transistor that has the first detection signal input to a base thereof, and that outputs a second detection signal that depends on the first detection signal from a collector thereof; and an alternating current signal path along which the alternating current signal is supplied to the base of the second transistor.