Abstract: An amplifier circuit includes: an amplifier connected to an isolating element; a signal midpoint detecting circuit connected in parallel with the isolating element; a bias adding circuit connected in series with the signal midpoint detecting circuit; and an initial voltage value detecting circuit connected to the frame detecting circuit. The initial voltage value detecting circuit holds an initial voltage value of the baseband signal using a signal from the frame detecting circuit, and outputs the initial voltage value to the signal midpoint detecting circuit. The signal midpoint detecting circuit detects a midpoint voltage from the baseband signal and the initial voltage value, and outputs the midpoint voltage to the bias adding circuit. The bias adding circuit adds the midpoint voltage to a bias voltage for biasing the baseband signal. The amplifier amplifies the baseband signal.

Abstract: A transducer includes a conductive sheet installed on a sheath of a cable, an insulative sheet installed on the conductive sheet, holes being formed in predetermined positions of the insulative sheet, and a conductive sheet installed on the insulative sheet, holes being formed in predetermined positions of the conductive sheet. The transducer has structure in which, when the cable is tightened by the screw from the top of the conductive sheet and fixed, the distal end of the screw comes into contact with the conductive sheet passing through the holes formed in the insulative sheet and the conductive sheet, and the conductive sheet and the conductive sheet are electrically connected.

Abstract: A loosening detection structure used to detect loosening of a bolt includes a material that is disposed between a fixing subject steel plate and a head portion of a metal bolt for fixing the steel plate and either attached to a seating surface of the head portion of the bolt or attached to a washer disposed between the steel plate and the head portion of the bolt, and that has electrical characteristics that vary in response to variation in a force for fastening the bolt to the steel plate.

Abstract: An AD converter includes: an integration unit that uses an input voltage as an initial value and repeats an operation of integrating one or both of two types of unit voltages with the input voltage, thereby generating an integrated voltage; a switching threshold voltage unit that includes two types of threshold voltages causing the operation of integrating to be terminated; a comparator that compares the integrated voltage with the threshold voltages; an integration determination unit that, before the operation of integrating is started, causes the comparator to compare the input voltage with a rough adjustment threshold voltage corresponding to a larger one of the unit voltages; a unit voltage switching control unit that, when the rough adjustment threshold voltage is larger than the input voltage, controls the integration unit to generate the integrated voltage by using the two types of unit voltages; and a single unit voltage control unit that, when the rough adjustment threshold voltage is smaller than th

Abstract: An embodiment is a connecting circuit connected to the preceding stage of a transmission circuit and configured to receive a data signal includes an initial voltage value holding circuit, and a terminating load connected in series with the initial voltage value holding circuit. The initial voltage value holding circuit outputs, to the terminating load, an initial voltage value obtained when no data signal is input, and sets both ends of the terminating load at the same potential by a DC component.

Abstract: An AD converter with self-calibration function that does not require an instrument for calibration, and includes: a reference voltage unit that generates a reference voltage; a summation and conversion unit that has two or more unit voltages serving as units of amount of change in a summed voltage, and during conversion, sums up any one unit voltage of the two or more unit voltages until the summed voltage exceeds the reference voltage, with an input voltage being an initial value of the summed voltage; and a control unit including a calibration control section that calibrates the two or more unit voltages and an offset voltage of a comparator at a time of calibration, and a conversion control section that determines a polarity of the offset voltage of the comparator and thereafter converts the input voltage to a digital value during conversion.

Abstract: Provided is a surface change detection body capable of detecting a change in the surface of an object only with passive components. The surface change detection body is disposed on a surface of an object to detect a change in the surface, and includes: a sensor unit that resonates with a high-frequency signal; a signal propagation unit that propagates the high-frequency signal to the sensor unit; and an incidence and reflection unit that receives the high-frequency signal from the outside and outputs a high-frequency signal reflected from the sensor unit to the outside, the sensor unit is a parallel plate resonator in which a dielectric is interposed, and the incidence and reflection unit is an antenna having a length which is an integral multiple of one fourth of an effective wavelength of a resonance frequency of the parallel plate resonator.

Abstract: An integrated electronic component includes a lower chip having electrode pads, a molded resin, a rewiring layer, and an upper chip having electrode pads. The rewiring layer has electrode pads that are formed on the lower surface of an insulator and are connected to the electrode pads, electrode pads that are formed on the upper surface of the insulator and are connected to the electrode pads, and interlayer connection conductors that are formed in the insulator and connect the electrode pads and the electrode pads. The electrode pads and the electrode pads are disposed to face each other.

Abstract: A self-calibration-function-equipped AD converter that does not require a measurement device for calibration includes: a control unit including a calibration control unit configured to control an operation of calibrating the self-calibration-function-equipped AD converter, and a conversion control unit configured to control an operation of converting an input voltage to be subjected to conversion into a digital signal; a reference voltage unit configured to output a reference voltage; and an integration/conversion unit including an integrating unit configured to generate an integration voltage obtained by integrating two or more types of unit voltages, a comparator that has two inputs and is configured to compare the integration voltage and the input voltage or the reference voltage, and a crossbar switch configured to switch a connection depending on whether the integration voltage is to be input to one input of the comparator and the input voltage or the reference voltage is to be input to another input, or

Abstract: A variable reference voltage source that generates a variable reference voltage corresponding to setting data set from outside includes a control unit including a calibration control unit that controls operation for acquiring calibration data including calibration values of an offset voltage and a predetermined unit voltage of a determiner, which determines magnitudes of two voltages, and an output control unit that controls operation for generating, based on the calibration data, a variable reference voltage corresponding to the setting data set from the outside, a reference voltage unit that outputs a reference voltage, and an integrated-voltage generating unit that repeats, when the calibration control unit controls the operation, an integrating operation until an integrated voltage obtained by integrating at least two or more kinds of unit voltages becomes equal to the reference voltage and outputs, when the output control unit controls the operation, the variable reference voltage corresponding to the se

Abstract: A looseness detection sensor for detecting looseness of a bolt for fixing a component, including: a resonance unit arranged adjacent to a head portion of the bolt and made of an insulating material confining a high-frequency signal input externally; and a conductive member in conduction with the component across the resonance unit, wherein the conductive member is a cap put on the head portion of the bolt and includes a protrusion contacting a surface of the component.

Abstract: A bolt tightening torque management structure for a bolt for fastening a component includes: the bolt including a plurality of projections of different heights on a bearing surface of a head; a non-conductive film that is formed on the surface of the component, has a shaft hole through which a shaft of the bolt extends, and has a predetermined size; and a conductive film that has the shaft hole and a plurality of grooves, through which the projections extend, is formed on the non-conductive film, and has the same planar shape as the non-conductive film. The projections other than the projection having the smallest height are configured to be in contact with the surface of the component when the tightening torque of the bolt is appropriate. The base of each projection has a width dimensioned to close the corresponding groove.

Abstract: An AD converter includes: an integration unit 22 that uses an input voltage as an initial value and repeats an operation of integrating one or both of two types of unit voltages with the input voltage, thereby generating an integrated voltage; a switching threshold voltage unit 23 that includes two types of threshold voltages causing the operation of integrating to be terminated; a comparator 24 that compares the integrated voltage with the threshold voltages; an integration determination unit 11 that, before the operation of integrating is started, causes the comparator 24 to compare the input voltage with a rough adjustment threshold voltage corresponding to a larger one of the unit voltages; a unit voltage switching control unit 12 that, when the rough adjustment threshold voltage is larger than the input voltage, controls the integration unit 22 to generate the integrated voltage by using the two types of unit voltages; and a single unit voltage control unit 13 that, when the rough adjustment threshold vo

Abstract: An AD converter includes: an accumulation conversion unit that performs a comparison of magnitudes of an input voltage V2 and an accumulated voltage V1 obtained by accumulating a unit voltage and outputs a comparison signal representing a result of the comparison; an accumulation comparison determination unit that repeatedly compares an accumulated voltage V1, obtained by repeating the comparison until the comparison signal changes and corresponding to an accumulated voltage V1 at which the comparison signal changes, and the input voltage V2 a predetermined number of times to determine an equivalent-state accumulation number in which a state probability that the comparison signal changes is equal to a threshold; and a control unit that determines conversion data of the input voltage using the equivalent-state accumulation number.

Abstract: A sensor for detecting looseness of a plurality of bolts and nuts fixing parts includes: a non-conductive film attached to a surface of the part, which is one of the parts, including holes H from which the bolts are inserted; and a conductive film attached to the non-conductive film, configured to receive supply of a high-frequency signal, and having a same planar shape as that of the non-conductive film, wherein the planar shape is a shape in which a resonance frequency of the high-frequency signal confined in the non-conductive film is different according to a position of a loosened bolt, and the planar shape of the conductive film is a shape in which a distance between a bolt and an end portion of the conductive film is different for each of the plurality of bolts.

Abstract: An AD converter with self-calibration function that does not require an instrument for calibration, and includes: a reference voltage unit that generates a reference voltage; a summation and conversion unit that has two or more unit voltages serving as units of amount of change in a summed voltage, and during conversion, sums up any one unit voltage of the two or more unit voltages until the summed voltage exceeds the reference voltage, with an input voltage being an initial value of the summed voltage; and a control unit including a calibration control section that calibrates the two or more unit voltages and an offset voltage of a comparator at a time of calibration, and a conversion control section that determines a polarity of the offset voltage of the comparator and thereafter converts the input voltage to a digital value during conversion.

Abstract: A loosening detection structure used to detect loosening of a bolt includes a material that is disposed between a fixing subject steel plate and a head portion of a metal bolt for fixing the steel plate and either attached to a seating surface of the head portion of the bolt or attached to a washer disposed between the steel plate and the head portion of the bolt, and that has electrical characteristics that vary in response to variation in a force for fastening the bolt to the steel plate.

Abstract: A looseness detection structure configured to detect looseness between a bolt and a nut that fix two components including a conductive film configured to be attached on a surface of the component, the surface of the component including a hole into which the bolt is inserted, the conductive film being attached such that the conductive film is not directly conductive to the component, a part of the conductive film having a dimension relating to a half wavelength of a high-frequency signal propagating inside the components, and a non-conductive film between a surface of the component and the conductive film in a case where surfaces of the components are conductors, and a second conductive film on a surface of the component in a case where the surfaces of the components are insulators, the second conductive film being opposite to the conductive film.

Abstract: A self-calibration-function-equipped AD converter that does not require a measurement device for calibration includes: a control unit including a calibration control unit configured to control an operation of calibrating the self-calibration-function-equipped AD converter, and a conversion control unit configured to control an operation of converting an input voltage to be subjected to conversion into a digital signal; a reference voltage unit configured to output a reference voltage; and an integration/conversion unit including an integrating unit configured to generate an integration voltage obtained by integrating two or more types of unit voltages, a comparator that has two inputs and is configured to compare the integration voltage and the input voltage or the reference voltage, and a crossbar switch configured to switch a connection depending on whether the integration voltage is to be input to one input of the comparator and the input voltage or the reference voltage is to be input to another input, or

Abstract: A crack detection device includes: a sensor unit that has a three-layer structure of conductor-insulator-conductor and is attached to a structure; a frequency characteristics acquisition unit that sweeps a predetermined frequency range to acquire a plurality of frequencies at which the impedance of the sensor unit is maximum or minimum; a crack presence/absence determination unit that determines the presence or absence of a crack based on a nonuniformity of the plurality of frequencies; a crack position table in which a relationship between crack positions and frequency shift directions is recorded; and a crack position detection unit that, when the crack presence/absence determination unit determines that there is a crack, takes a difference between two frequencies acquired by the frequency characteristics acquisition unit to determine a sign, and then refers to the crack position table in accordance with the sign to detect a crack position.