Abstract: A crystal resonator includes a crystal plate and an electrode set. The crystal plate includes a first vibration section and a second vibration section arranged along an oscillating direction, and exhibits a thickness shear mode. The electrode set includes a first electrode pair disposed on the first vibration section, and a second electrode pair disposed on the second vibration section. The first electrode pair and the second electrode pair are configured to apply the applied voltages with opposite electrical polarities to the first vibration section and the second vibration section, respectively, which causes the first vibration section and the second vibration section to dynamically deform in the thickness shear mode along the oscillating direction, and do out of phase motion with respect to each other.

Abstract: A digitally controlled frequency generator includes an oscillator module for generating a first clock signal having an oscillating frequency, a programmable control module operable so as to generate a control signal corresponding to a desired frequency, and a direct digital frequency synthesizer coupled to the oscillator module and the programmable control module for receiving the first clock signal and the control signal therefrom, and for generating a second clock signal having the desired frequency based on the first clock signal from the oscillator module and the control signal from the programmable control module.

Abstract: A package device, such as an oscillator, includes a package module, a circuit module, a plurality of conductive pins, and a plurality of conductive arms. The package module defines an airtight space therein. The circuit module is disposed in the airtight space in the package module. Each of the conductive pins extends into the airtight space in the package module. Each of the conductive arms is disposed in the airtight space, and has a first end that is connected to the circuit module, a second end that is connected to a respective one of the conductive pins, and an intermediate portion that extends between the first and second ends thereof and that has a length longer than the shortest distance between the first and second ends thereof.

Abstract: An aging compensation method for an oscillator circuit device, in which the oscillator circuit device receives a control voltage from an application end, and outputs a clock signal with a predetermined frequency in response to the control voltage, includes the steps of: a) inspecting the control voltage from the application end to obtain a first value thereof; b) after a predetermined time period has elapsed, inspecting the control voltage from the application end to obtain a second value thereof; c) determining whether there is a difference between the first and second values of the control voltage; d) if it is determined that there is a difference, performing compensation on the value of the control voltage based on the difference; and e) repeating steps b) through d).

Abstract: A package device, such as an oscillator, includes a package module, a circuit module, a plurality of conductive pins, and a plurality of conductive arms. The package module defines an airtight space therein. The circuit module is disposed in the airtight space in the package module. Each of the conductive pins extends into the airtight space in the package module. Each of the conductive arms is disposed in the airtight space, and has a first end that is connected to the circuit module, a second end that is connected to a respective one of the conductive pins, and an intermediate portion that extends between the first and second ends thereof and that has a length longer than the shortest distance between the first and second ends thereof.

Abstract: An aging compensation method for an oscillator circuit device, in which the oscillator circuit device receives a control voltage from an application end, and outputs a clock signal with a predetermined frequency in response to the control voltage, includes the steps of: a) inspecting the control voltage from the application end to obtain a first value thereof; b) after a predetermined time period has elapsed, inspecting the control voltage from the application end to obtain a second value thereof; c) determining whether there is a difference between the first and second values of the control voltage; d) if it is determined that there is a difference, performing compensation on the value of the control voltage based on the difference; and e) repeating steps b) through d).

Abstract: A crystal oscillator device includes a package housing having conductive coupling seats disposed fixedly in a vacuum chamber thereof, and conductive contacts exposed outwardly of the package housing. Each conductive coupling seat is connected electrically to a corresponding conductive contact. A circuit board is disposed in the vacuum chamber, and has terminals connected electrically and respectively to the conductive coupling seats. A crystal oscillator is mounted on a first surface of the circuit board. A heating control circuit is mounted on a second surface of the circuit board for heating the vacuum chamber in accordance with variation of the temperature in the vacuum chamber so as to maintain the temperature in the vacuum chamber at a predetermined temperature.