In an integrated circuit device having a microelectromechanical-system (MEMS) resonator and a temperature transducer, a clock signal is generated by sensing resonant mechanical motion of the MEMS resonator and a temperature signal indicative of temperature of the MEMS resonator is generated via the temperature transducer. The clock signal and the temperature signal are output from the integrated circuit device concurrently.

A piezoelectric device package includes a board having a lower surface and an upper surface, a plurality of terminals disposed on the lower surface, a piezoelectric device disposed on the upper surface, a thermistor layer and a resistance layer disposed on the lower surface, and a cap lead covering an upper portion of the board.

A temperature sensor supplying a measurement signal varying linearly to within 10% as a function of the temperature at least over a temperature range, including an oscillator supplied by a supply voltage and supplying a first oscillating signal, said oscillator including first MOS transistors, the voltage at each internal node of the oscillator having a dynamic equal to the supply voltage, the measuring signal corresponding to the supply voltage.

An object of the present invention is to enhance fault detection accuracy offered by a fault detection apparatus. A microcomputer reads a characteristic signal input thereto. The microcomputer compares a characteristic read from the characteristic signal with a previously established reference value. The previously established reference value represents a characteristic exhibited by a resistor that is connected with a temperature sensor circuit when the temperature sensor circuit operates normally. The microcomputer determines whether the characteristic exhibited by the resistor falls within a detection range. If it is determined that the characteristic falls with the detection range, the temperature sensor circuit is detected to be operational and information indicating that the temperature sensor circuit is operational is output to a host control apparatus. If it is determined that the detection range is exceeded, the temperature sensor circuit is detected to be faulty and information indicating that the temperature sensor circuit is faulty is output to the host control apparatus.

Measurement apparatus, for generating a first output signal indicative of a measurand, comprises: a first oscillator circuit and a second oscillator circuit, each oscillator circuit being arranged to generate a respective oscillating output signal and comprising at least a respective first component having a property determining a respective output frequency of the respective oscillating output signal; a sensor for sensing said measurand, the sensor comprising said first component of the first oscillator circuit, said property of said first component of the first oscillator circuit being dependent upon said measurand; and circuitry arranged to receive said oscillating output signals and generate said first output signal, said first output signal being indicative of a number of cycles of one of the first and second oscillating output signals in a time period determined by a period of the other of said first and second oscillating output signals.

A predictive electronic thermometer circuit structure capable of temperature compensation is provided, including: a compensation module, a thermometer circuit, and a liquid crystal display (LCD) drive module. The thermometer circuit includes a temperature measurement oscillation circuit and a real measurement module. The compensation module and the real measurement module are connected in parallel between the temperature measurement oscillation circuit and the LCD drive module. The predictive electronic thermometer circuit structure controls the on and off of the compensation module and the real measurement module through a combination logic control switch respectively. When the compensation module is off and the real measurement module is on, an actual measured data is output. When the real measurement module is off and the compensation module is on, a temperature value is output after predictive compensation. The electronic thermometer has a temperature compensation function, and measures the temperature quickly and accurately.

A semiconductor drive device includes a drive circuit that drives a semiconductor switching element, a passive element connected to a gate of the semiconductor switching element to prevent a gate current of the semiconductor switching element, a switching element connected in series to the passive element, a control circuit that controls the switching element, and a temperature detection circuit that detects a temperature of the semiconductor switching element. The control circuit controls the switching element such that when the temperature detected by the temperature detection circuit is high, the gate current is prevented more than when the temperature is low.

In an integrated circuit device having a microelectromechanical-system (MEMS) resonator and a temperature transducer, a clock signal is generated by sensing resonant mechanical motion of the MEMS resonator and a temperature signal indicative of temperature of the MEMS resonator is generated via the temperature transducer. The clock signal and the temperature signal are output from the integrated circuit device concurrently.

A temperature sensor circuits includes a temperature sensing module, a current generator, a current controlled oscillator, and a counter. The temperature sensing module is sensitive to temperature changes. The current generator respectively generates a positive temperature coefficient current positively related to temperature and a negative temperature coefficient current negatively related to temperature according to the temperature sensed by the temperature induction module. The current controlled oscillator oscillates according to the positive and the negative temperature coefficient currents respectively and outputs a positive and negative temperature coefficient oscillation signals. The counter receives a clock signal and calculates a first period accumulation number of the negative temperature coefficient oscillation signal and a second period accumulation number of the positive temperature coefficient oscillation signal in the same number of clock periods respectively, and acquires a temperature value based on the period accumulation numbers.

A quantum interference device includes an atomic cell which has an internal space enclosing an alkali metal, a first light source which emits a resonance light pair circularly polarized in the same direction as each other and exciting the alkali metal, a second light source which emits an adjustment light, and a light receiver, wherein the atomic cell includes a first layer which is provided on an inner wall surface surrounding the internal space of the atomic cell and contains a compound derived from a first compound that is an oxide of a metal having a lower ionization tendency than the alkali metal, a second layer which is provided on the first layer and contains a compound derived from a second compound having a functional group that undergoes an elimination reaction with the compound derived from the first compound, and a third layer which is provided on the second layer and contains a compound derived from a third compound that is nonpolar.