Abstract: A piezoelectric resonator includes a resonator substrate having a resonating body with a thickness that is associated with a resonant frequency, a conductor disposed on the resonating body and having a body electrode, a base having a groove aligned with the body electrode and defined by a groove-defining wall, a base electrode disposed on the groove-defining wall and cooperating with the body electrode and the base to form a capacitor load, and a cap disposed on the resonator substrate in a manner that the resonator substrate is sandwiched between the cap and the base.

Abstract: A piezoelectric resonator includes a resonator substrate having a resonating body with a thickness that is associated with a resonant frequency, a conductor disposed on the resonating body and having a body electrode, a base having a groove aligned with the body electrode and defined by a groove-defining wall, a base electrode disposed on the groove-defining wall and cooperating with the body electrode and the base to form a capacitor load, and a cap disposed on the resonator substrate in a manner that the resonator substrate is sandwiched between the cap and the base.

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: An integrated circuit is adapted for heating a chamber, and includes a control module operable so as to generate a control signal according to a desired temperature, and a heater connected electrically to the control module for heating the chamber in accordance with the control signal from the control module so as to maintain the temperature in the chamber at the desired temperature. A heating control circuit and an electronic device including the heating control circuit are also disclosed.

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.