Abstract: Circuit arrangement measuring at least one measurement capacitor having inverting amplifier with high open-circuit voltage gain, input connected to connection of at least one measurement capacitor and to connection of negative feedback capacitor, another connection of at least one measurement capacitor connected to a reference potential and another connection of negative feedback capacitor connected to output of inverting amplifier; rectifier circuit fed voltage at the output of inverting amplifier and generates at its output voltage corresponding to voltage at output of inverting amplifier; a holding capacitor buffering voltage supply of inverting amplifier and rectifier circuit, a supply voltage connection of inverting amplifier supplied with a periodic control voltage with respect to reference potential and other supply voltage connection of inverting amplifier supplied via a diode with external supply voltage, periodic control voltage generated by signal source having a control input via which level of pe

Abstract: In one example, an apparatus comprises: a first transistor coupled between a power terminal and a switching terminal; a second transistor coupled between the power terminal and a first sense terminal; a third transistor coupled between the switching terminal and a ground terminal; a fourth transistor coupled between a second sense terminal and the ground terminal; a first variable current source coupled to the first sense terminal; a second variable current source coupled to the second sense terminal; a processing circuit having first, second, third, and fourth inputs and first and second outputs, the first input coupled to the switching terminal, the second input coupled to the first sense terminal, the third input coupled to the ground terminal, the fourth input coupled to the second sense terminal, the first output coupled to the first variable current source, and the second output coupled to the second variable current source.

Abstract: A float detector includes a latch and a float detection circuit. The latch includes a latch output and an input/output (I/O) terminal. The I/O terminal is coupled to an input terminal. The float detection circuit includes a detection input, a drive output, and a float detection circuit. The detection input is coupled to the latch output. The drive output is coupled to the I/O terminal. The float detector is configured to provide a drive signal at the drive output, and determine that the input terminal is floating based on a latch output signal received at the detection input responsive to the drive signal.

Abstract: A biologically sensitive field effect transistor includes a substrate, a first control gate and a second control gate. The substrate has a first side and a second side opposite to the first side, a source region and a drain region. The first control gate is disposed on the first side of the substrate. The second control gate is disposed on the second side of the substrate. The second control gate includes a sensing film disposed on the second side of the substrate. A voltage biasing between the source region and the second control gate is smaller than a threshold voltage of the second control gate.

Abstract: In a substrate inspection method, a substrate is provided on a substrate stage, the substrate having internal wires and connection wires, the internal wires respectively provided between stacked insulating layers, the connection wires respectively extending from the internal wires and exposed to an upper surface of the substrate. An electric circuit of the internal wires in the substrate is modeled to generate a circuit model. AC power is applied to the substrate stage to obtain measured capacitance values of the internal wires through currents that are obtained from the connection wires. DC power is applied to the substrate stage to obtain measured resistance values of the internal wires through voltages that are obtained from the connection wires. Impedance values of the internal wires are calculated through the measured capacitance values and the measured resistance values. The impedance values and the circuit model are compared to determine reliability of the substrate.

Abstract: A position sensor system includes a magnetic source and a sensor device movable relative to the magnetic source. The magnetic source has a first track of alternating magnetic poles, and a second track of an equal number of alternating poles, but 180° phase shifted relative to the first track. The sensor device is configured for measuring a plurality of magnetic field components, including a first magnetic field component at a first sensor location facing the first track, and a second magnetic field component oriented parallel to the first magnetic field component at a second sensor location facing the second track, and for deriving a first and a second difference signal from the plurality of magnetic field components, and for determining a position based on these difference signals.

Abstract: A portable device including a capacitive proximity sensor can suppress a drift superimposed to the capacitive proximity signal and the corresponding method. A processor generates a baseline value by integrating a series of values that are derived from the slope of the proximity signal, when the slope is within stated limits, or a fixed value outside of the stated limits.

Abstract: Examples are disclosed that relate to sensing a position of a surface proximate to a resonant LC sensor. One example provides a method on a sensing device comprising one or more resonant LC sensors each configured to output a signal responsive to a position of a surface proximate to the resonant LC sensor. The method comprises, for each LC sensor, generating an oscillating signal on an antenna of the resonant LC sensor and detecting a near-field response of the resonant LC sensor at a selected frequency.

Abstract: Various embodiments are described herein for measuring the impedance properties of a load using load analysis signals. In one example embodiment, a transformer is provided which includes at least one primary winding, and at least one secondary winding. The at least one primary winding is coupled in series between a direct-current (DC) power supply and the load. A variable alternating-current (AC) voltage generator is coupled in-series to the at least one secondary winding, and is configured generate at least one load analysis signal for injection into the load. The impedance properties of the load may be determined for different frequencies in the load analysis signals.

Abstract: Systems and methods include a computer-implemented method for determining a concentration of hydrocarbon fuel in a fluid sample. A thin Cyclic Olefin Copolymer (COC) film of a COC layer having a honeycomb mesh-pattern forming a conductive metal trace is sputtered. The thin COC film is configured to dissolve upon contact with alkyl aromatic compounds present in hydrocarbon fuels. A fluid sample of a hydrocarbon fuel is positioned in an open area on the thin COC film. A resistivity of the conductive metal trace is monitored. A determination is made in response to the monitoring that a change in resistivity of the conductive metal trace has occurred resulting from dissolution of the thin COC film. A time duration is measured from the positioning of the fluid sample to the resistivity change. A concentration of the hydrocarbon fuel in the fluid sample is determined based on the time duration.

Abstract: The present disclosure relates to determining a location of a noise source where the location includes azimuth information and determining cement-bond integrity. A downhole tool disposed in a borehole may comprise one or more receivers (such as a monopole receiver and any one or more of one or more multi-pole receivers) and in certain embodiments one or more transmitters that fire one or more shots may provide azimuthal estimate of the location of a noise source, a location of a leak in one or more layers of a casing, cement-bond integrity any combination thereof based, at least in part, on one or more measurements or data for received signals at any one or more receivers. Accurate and efficient identification of a leak or integrity of a cement-bond reduces overall inefficiencies and costs associated with a downhole operation.

Abstract: An indication system includes the following features. A mechanism is within an enclosure. An indicator is mounted to an outer surface of the enclosure. A magnet couples the indicator to a component of the mechanism indicative of a state of the mechanism. The indicator displays a reading indicative of the state of the mechanism responsive to the magnet coupling.

Abstract: A system includes at least one sensing unit, the sensing unit including a sensing element. The system includes at least one spatial Lorentz filter coupled to the sensing element. The spatial Lorentz filter (SLF) includes an input coupled to the sensing element and an analog to digital converter (ADC) providing a filtered output signal. The sensing unit is connected to a processor configured for determining velocity or position with respect to a magnetic field and/or a geographic position by processing SLF output signals.

Abstract: A bus bar assembly includes a first housing; a first bus bar extending through the first housing; a second bus bar extending through the first housing, the second bus bar including a second housing that defines at least one first receiver configured to engage a fastener; and a sensor assembly mounted to the receiver, the sensor assembly including a current sensor positioned between the first bus bar and the second bus bar. The sensor assembly may not include a magnetic core, and the current sensor may be a coreless sensor configured to detect a current through the bus bar assembly.

Abstract: A magnetic field sensor for measuring a direct current includes a transducer formed of coils with superparamagnetic core in series; an excitation module generating an excitation current at an excitation frequency, via a midpoint coil, an excitation voltage generator and an excitation impedance. An analysis module includes an analysis impedance coupled to the midpoint coil, and an analyzer that analyzes the current passing through the analysis impedance to extract a component at an analysis frequency equal to an even multiple of the excitation frequency. The excitation impedance forms with the superparamagnetic coils a first series RLC circuit with a resonance frequency, which is substantially equal to the excitation frequency, and a second series RLC-type circuit with an analysis resonance frequency, which is substantially equal to the analysis frequency.

Abstract: A computer-implemented method for predicting a quality of a battery includes receiving a first battery measurement data for a first duration of soaking the battery, the first duration shorter than or equal to the soaking. The method further includes computing a plurality of features based on the first battery measurement data. The method further includes predicting, based on the plurality of features, a state of the battery after completion of the soaking. The method further includes outputting suitability of the quality of the battery based on the state of the battery as predicted.

Abstract: Systems, apparatuses, semiconductor products and methods for circuit testing, specifically non-contact circuit testing are provided that allow for the wireless, non-contact testing of an electrical component. For example, non-contact circuit testing is performed using a non-contact testing apparatus that include a circuit cover with a conductive material and an oscilloscope. The circuit cover is places over an electrical component to form a parallel plate capacitor with electrical component. The parallel plate capacitor is formed with an air dielectric between the electrical component and the circuit cover. An electrical signal is initiated at the electrical component to cause a voltage through the parallel plate capacitor. An oscilloscope probe is used to measure the voltage of the parallel plate capacitor to determine a connectivity of the electrical component without contacting the electrical component.

Abstract: A proximity sensor for a portable wireless connected device, the sensor being arranged to determine whether a part of a user's body is near the portable connected wireless device. The sensor generates a time-averaged proximity that is alerted when the device is brought near a part of a user's body for a given time and may be periodically reset momentarily during the periods of proximity. An integration time comparable with that used in SAR testing, enables the sensor to reduce the radio power emitted by a portable device when it is near the body. The integration time can be obtained by a sigma/delta modulator configured as rate-compression unit.

Abstract: An abnormal detection circuit is provided. The abnormal detection circuit includes a conversion circuit, a voltage detection circuit, and a warning circuit. The conversion circuit receives a three-phase alternating current (AC) power and converts the three-phase AC power into a driving power. The voltage detection circuit detects each phase of the three-phase AC power. When a voltage value of at least one phase AC power of the three-phase AC power is abnormal, the voltage detection circuit uses the driving power to output at least one control signal corresponding to the abnormality. The warning circuit is driven by receiving the driving power and outputs at least one warning signal corresponding to the abnormality in response to the at least one control signal.

Abstract: A measurement method for the impedance of the converter at multiple operating points based on the secondary-side disturbance includes the following steps: superimposing the positive sequence current disturbance in the current sampling value; superimposing the positive sequence voltage disturbance in the voltage sampling value; determining whether measurement data of the converter at two or more current operating points are obtained, if so, based on the measurement data of the converter at two current operating points, calculating values of A(s) and B(s); further calculating values of coefficients at each frequency point, and obtaining the impedance value of the converter at multiple current operating points by calculation. The above-mentioned measurement method overcomes the disadvantages of high cost and complicated operation of the impedance measurement method based on the primary-side disturbance, and solves the problem of lacking the pre-judgment function.