An oscillator includes a resonation element, a first package that houses the resonation element and airtightly sealed, a circuit element that is positioned outside the first package and electrically connected to the resonation element, and a second package that houses the first package and the circuit element and sealed in a depressurized state. In addition, the first package includes a first base having a first recessed portion, and a first lid joined to the first base so as to close an opening of the first recessed portion, and the second package includes a second base having a second recessed portion and a second lid joined to the second base so as to close an opening of the second recessed portion. The circuit element is attached to the first base, and the first base is attached to the second base.

An oscillator includes a first package that is airtightly sealed, a second package that is housed in the first package and airtightly sealed, a resonation element that is housed in the second package, and a circuit element that is housed in the first package in a state of being positioned outside the second package and electrically connected to the resonation element and has an oscillation circuit and a temperature compensation circuit. In addition, the first package includes abase having two main surfaces and a recessed portion provided on one of the main surfaces, and a lid joined to the base so as to close the opening of the recessed portion. The circuit element is attached to the base, and the second package is attached to the circuit element.

A package includes a first layer on which a quartz crystal resonator element is mounted; a second layer that is joined to the first layer and on which a circuit element mounted; a third layer that is joined to a surface of the second layer that is opposite in direction to a surface of the second layer, on which the circuit element is mounted; a connection pad that is provided on the first layer; an external lateral surface terminal that is electrically connected to the connection pad; resonance element wiring that electrically connects the connection pad and the external lateral surface terminal to each other, in which the resonance element wiring is positioned between the third layer and the second layer, and includes terminal wiring that is connected to the external lateral surface terminal and interlayer wiring that connects the connection pad and the terminal wiring.

A circuit device includes a phase comparator that performs phase comparison between an input signal based on an oscillation signal and a reference signal, a processor that performs a digital signal process on phase comparison result data which is a result of the phase comparison so as to generate frequency control data, and an oscillation signal generation circuit that generates the oscillation signal having an oscillation frequency which is set on the basis of the frequency control data. The processor performs the digital signal process by using data used when a hold-over state is ended in a case where the hold-over state occurs due to the absence or the abnormality of the reference signal, and then the hold-over state is ended.

A vibrator device includes a base; and a vibrator element including a quartz crystal vibrator element attached to the base via a first metal bump, in which the first metal bump is disposed on a straight line inclined within a range of +55 to +65 or 65 to 55 with respect to an X axis of the quartz crystal constituting the quartz crystal vibrator element in plan view seen from a direction in which the base and the quartz crystal vibrator element are arranged.

A crystal oscillator device is disclosed. The crystal oscillator device includes a casing; a crystal piece; a pair of excitation electrodes; a transmission antenna electrically coupled to one of the excitation electrodes; a reception antenna configured to receive a radio wave from the transmission antenna; and an alarm generator configured to generate an alarm based on a signal whose amplitude is equal to or less than a reference value, the signal being received by the reception antenna.

An apparatus includes a temperature sensor, a digitally-controlled capacitor and a processor. The temperature sensor is coupled to a crystal oscillator and configured to generate an input signal depending on a temperature of the crystal oscillator. The digitally-controlled capacitor is connected to the crystal oscillator and configured to receive a control signal and, based on the control signal, to control a frequency of an output signal generated by the crystal oscillator. The processor is configured to receive the input signal from the temperature sensor, to convert the input signal into the control signal based on parameters that characterize the crystal oscillator and the digitally-controlled capacitor, and to apply the control signal to the digitally-controlled capacitor.

An integrated circuit device includes a substrate, a joining part provided on the substrate and joined to a vibrator, and a plurality of bonding pads provided on the substrate. The joining part includes an insulating protective film that covers a part of a surface of the substrate, and no insulating protective film is provided between the adjacent bonding pads.

A piezoelectric oscillator includes: a piezoelectric vibrating element having a piezoelectric strip, a first excitation electrode, and a second excitation electrode; a first crystal substrate bonded to the piezoelectric strip; and a second crystal substrate bonded to the piezoelectric strip. The first crystal substrate has a principal surface defined by a first basic axis and a second basic axis that intersects the first basic axis, and when an axis obtained by inclining, among mutually intersecting first, second, and third crystallographic axes of a material of the first crystal substrate, the third axis around the first axis by a first predetermined angle is regarded as a first inclined axis, the first axis corresponds to the first basic axis and the first inclined axis corresponds to the second basic axis, the first predetermined angle is any angle included in an angle range of ?90 to ?60 degrees and 80 to 90 degrees.

A circuit device includes an A/D conversion section adapted to perform an A/D conversion of a temperature detection voltage from a temperature sensor to output temperature detection data, a processing section adapted to perform a temperature compensation process of an oscillation frequency based on the temperature detection data to output frequency control data of the oscillation frequency, and an oscillation signal generation circuit adapted to generate an oscillation signal using the frequency control data and a resonator. The processing section may change the frequency control data in increments of kLSB (k1) based on a change in temperature.