Abstract: A circuit device includes: a first terminal and a second terminal coupled to a resonator; an amplifier circuit configured to amplify a signal from the first terminal and output the amplified signal to the second terminal; a variable resistance circuit that is provided on a signal path between the amplifier circuit and the second terminal and includes a variable resistor, a first switch provided at one end of the variable resistor, and a second switch provided at the other end of the variable resistor; a third switch coupled in parallel to the variable resistance circuit; and a control circuit configured to control a resistance value of the variable resistor and control the first switch, the second switch, and the third switch to be turned on or off.

Abstract: A circuit device includes: a first terminal and a second terminal coupled to a resonator; a third terminal; a fourth terminal; a first switch provided on a signal path between the first terminal and the third terminal; a second switch provided on a signal path between the second terminal and the fourth terminal; and a register configured to output a signal for controlling the first switch and the second switch to be turned on or off. In a first mode, the first switch and the second switch are turned off, a control signal is input to the third terminal, and a clock signal is output from the fourth terminal. In a second mode, the first switch and the second switch are turned on.

Abstract: A circuit device includes: a first terminal and a second terminal coupled to a resonator; an amplifier circuit configured to amplify a signal from the first terminal and output the amplified signal to the second terminal; a variable resistance circuit that is provided on a signal path between the amplifier circuit and the second terminal and includes a variable resistor, a first switch provided at one end of the variable resistor, and a second switch provided at the other end of the variable resistor; a third switch coupled in parallel to the variable resistance circuit; and a control circuit configured to control a resistance value of the variable resistor and control the first switch, the second switch, and the third switch to be turned on or off.

Abstract: A circuit device includes a first terminal, a first oscillation circuit oscillating a resonator and generating a first voltage for automatic gain control for controlling amplitude of a signal output from the resonator, a digital signal generation circuit generating a digital signal corresponding to the first voltage, and a first interface circuit outputting the digital signal to the first terminal.

Abstract: A circuit device includes an oscillation circuit and a processing circuit that generates capacitance control data. The oscillation circuit includes a variable capacitance circuit whose capacitance value is variably controlled based on the capacitance control data, and an oscillation frequency thereof is controlled based on the capacitance value of the variable capacitance circuit. The variable capacitance circuit includes a capacitor array. The capacitor array includes a plurality of capacitors each having a binary-weighted capacitance value, and a plurality of switches that are on-off controlled based on the capacitance control data. The processing circuit outputs the capacitance control data, which is subjected to dithering, so as to switch the capacitance value of the variable capacitance circuit between a first capacitance value and a second capacitance value in a time division manner.

Abstract: A circuit device includes an oscillation circuit generating an oscillation signal by oscillating a vibrator, a temperature sensor circuit performing an intermittent operation, a logic circuit performing temperature compensation processing based on an output of the temperature sensor circuit, and a power supply circuit supplying power to the oscillation circuit. The oscillation circuit is disposed in a circuit region, the temperature sensor circuit and the logic circuit are disposed in a circuit region, and the power supply circuit is disposed in a circuit region, which is positioned between the circuit region and the circuit region.

Abstract: A circuit device includes an oscillation circuit generating an oscillation signal by oscillating a vibrator, a temperature sensor circuit performing an intermittent operation, a logic circuit performing temperature compensation processing based on an output of the temperature sensor circuit, and a power supply circuit supplying power to the oscillation circuit. Further, the logic circuit or the power supply circuit is disposed between the oscillation circuit and the temperature sensor circuit.

Abstract: A variable capacitance circuit includes a capacitor array having a first capacitor in which a plurality of MIM capacitors are coupled in parallel and a second capacitor in which a plurality of MIM capacitors are coupled in series, and a switch array having a first switch and a second switch. A shape pattern of at least one of a first electrode of the first capacitor, a first ground shield, a second electrode of the second capacitor, and a second ground shield is set so that a first capacitance difference per 1 LSB between first capacitance values of the first capacitor when the first switch is turned on and off and a second capacitance difference per 1 LSB between second capacitance values of the second capacitor when the second switch is turned on and off are close to each other.

Abstract: A circuit device includes a first terminal, a first oscillation circuit oscillating a resonator and generating a first voltage for automatic gain control for controlling amplitude of a signal output from the resonator, a digital signal generation circuit generating a digital signal corresponding to the first voltage, and a first interface circuit outputting the digital signal to the first terminal.

Abstract: A circuit device includes an oscillation circuit that generates an oscillation signal by using a vibrator, a frequency adjustment circuit that adjusts an oscillation frequency of the oscillation circuit based on frequency adjustment data, a temperature sensor circuit that outputs temperature data, an arithmetic operation circuit, and a storage circuit. The arithmetic operation circuit outputs converted temperature data by performing, on the temperature data, conversion processing in which a slope of the converted temperature data with respect to the temperature data in a first temperature range is different from a slope of the converted temperature data with respect to the temperature data in a second temperature range. The storage circuit stores a lookup table representing a correspondence between the converted temperature data and the frequency adjustment data.

Abstract: A variable capacitance circuit includes a capacitor array having a first capacitor in which a plurality of MIM capacitors are coupled in parallel and a second capacitor in which a plurality of MIM capacitors are coupled in series, and a switch array having a first switch and a second switch. A shape pattern of at least one of a first electrode of the first capacitor, a first ground shield, a second electrode of the second capacitor, and a second ground shield is set so that a first capacitance difference per 1 LSB between first capacitance values of the first capacitor when the first switch is turned on and off and a second capacitance difference per 1 LSB between second capacitance values of the second capacitor when the second switch is turned on and off are close to each other.

Abstract: A circuit device includes an oscillation circuit and a processing circuit that generates capacitance control data. The oscillation circuit includes a variable capacitance circuit whose capacitance value is variably controlled based on the capacitance control data, and an oscillation frequency thereof is controlled based on the capacitance value of the variable capacitance circuit. The variable capacitance circuit includes a capacitor array. The capacitor array includes a plurality of capacitors each having a binary-weighted capacitance value, and a plurality of switches that are on-off controlled based on the capacitance control data. The processing circuit outputs the capacitance control data, which is subjected to dithering, so as to switch the capacitance value of the variable capacitance circuit between a first capacitance value and a second capacitance value in a time division manner.

Abstract: A circuit device includes an oscillation circuit generating an oscillation signal by oscillating a vibrator, a temperature sensor circuit performing an intermittent operation, a logic circuit performing temperature compensation processing based on an output of the temperature sensor circuit, and a power supply circuit supplying power to the oscillation circuit. Further, the logic circuit or the power supply circuit is disposed between the oscillation circuit and the temperature sensor circuit.

Abstract: A circuit device includes an oscillation circuit that generates an oscillation signal by using a vibrator, a frequency adjustment circuit that adjusts an oscillation frequency of the oscillation circuit based on frequency adjustment data, a temperature sensor circuit that outputs temperature data, an arithmetic operation circuit, and a storage circuit. The arithmetic operation circuit outputs converted temperature data by performing, on the temperature data, conversion processing in which a slope of the converted temperature data with respect to the temperature data in a first temperature range is different from a slope of the converted temperature data with respect to the temperature data in a second temperature range. The storage circuit stores a lookup table representing a correspondence between the converted temperature data and the frequency adjustment data.

Abstract: A circuit device includes an oscillation circuit generating an oscillation signal by oscillating a vibrator, a temperature sensor circuit performing an intermittent operation, a logic circuit performing temperature compensation processing based on an output of the temperature sensor circuit, and a power supply circuit supplying power to the oscillation circuit. The oscillation circuit is disposed in a circuit region, the temperature sensor circuit and the logic circuit are disposed in a circuit region, and the power supply circuit is disposed in a circuit region, which is positioned between the circuit region and the circuit region.

Abstract: A physical quantity measurement device includes a sensor element in which coupling capacitances are formed between a drive electrode and a first detection electrode and between the drive electrode and a second detection electrode; and a circuit device that includes a drive circuit which supplies a drive signal to the drive electrode, a detection circuit which detects physical quantity information corresponding to a physical quantity based on first and second detection signals from the first and second detection electrodes, and a failure diagnosis circuit. The circuit device includes first and second switches that are provided between first and second terminals to which the first and second detection signals are input and the detection circuit. The failure diagnosis circuit performs a failure diagnosis, based on a detection result of the detection circuit when connection states of the first and second switches are changed.

Abstract: An air conditioning system includes: an air conditioner that includes an outdoor unit including an outside air temperature sensor and an indoor unit including an indoor unit controller to control air conditioning operation and communicable with the outdoor unit; and a remote controller communicable with the indoor unit. The remote controller includes: a schedule storage to store information on an operation schedule of the air conditioner for each date and time, a reference temperature for determining an operation mode of the air conditioner, and an outside air temperature correction value; and an operation mode determiner to select the operation mode from among cooling, blowing, and heating using the information on the operation schedule, a corrected outside air temperature, and the reference temperature. The indoor unit controller controls the air conditioning operation using the reference temperature as a target temperature in the operation mode determined by the operation mode determiner.

Abstract: An atomic oscillator includes: a light-emitting element; an atom cell that includes a first surface on which light beams from the light-emitting element are incident and a second surface from which the light beams incident on the first surface are emitted and accommodates alkali metal atoms in a gas state; a shield that accommodates the atom cell and has a magnetic shielding property, the shield having an opening; a heat transfer member that is in contact with a portion of the atom cell via an opening of the shield and has a thermal conductivity higher than a thermal conductivity of the atom cell; a temperature control element that is in contact with the heat transfer member and controls a temperature of the atom cell; and a light-receiving element that receives the light beams emitted from the second surface.

Abstract: A refrigeration cycle apparatus includes a refrigeration cycle circuit which includes a plurality of load-side heat exchangers; a plurality of indoor units which accommodate the plurality of load-side heat exchangers, respectively; and a controller which controls the plurality of indoor units. Each of the plurality of indoor units includes an air-sending fan. At least one of the plurality of indoor units includes a refrigerant detection unit. The controller divides the plurality of indoor units into one or more groups. The controller is set such that when refrigerant is detected by the refrigerant detection unit included in any of the plurality of indoor units, the controller causes the air-sending fans included in all the indoor units which belong to a same group as the indoor unit which includes the refrigerant detection unit which detects the refrigerant to be operated.

Abstract: A refrigeration cycle apparatus includes a refrigeration cycle circuit that includes a plurality of load-side heat exchangers and a plurality of indoor units that accommodate the plurality of load-side heat exchangers. Each of the plurality of indoor units includes an air-sending fan. At least one of the plurality of indoor units includes a refrigerant detection unit. When refrigerant is detected by the refrigerant detection unit included in any one of the plurality of indoor units, the air-sending fans included in all of the plurality of indoor units operate.