Patent application number | Description | Published |
20110121909 | TEMPERATURE COMPENSATION METHOD FOR PIEZOELECTRIC OSCILLATOR, AND PIEZOELECTRIC OSCILLATOR - A temperature compensation method for a piezoelectric oscillator including a piezoelectric vibrator having a frequency temperature characteristic with a hysteresis characteristic, and an oscillation circuit which oscillates the piezoelectric vibrator and outputs an oscillation signal, wherein, to a temperature compensation circuit which can calculate a quantity of temperature compensation using frequency temperature information indicating a temperature characteristic of an oscillation frequency of the piezoelectric vibrator and temperature information of the piezoelectric vibrator at the time of oscillation of the oscillation signal, the oscillation signal and the frequency temperature information are outputted, includes: calculating, as the frequency temperature information, an intermediate value between elevated-temperature frequency temperature information of the piezoelectric vibrator that is generated in the case where ambient temperature of the piezoelectric vibrator is elevated, and lowered-temperature frequency temperature information of the piezoelectric vibrator that is generated in the case where the ambient temperature is lowered. | 05-26-2011 |
20110210796 | OSCILLATION CIRCUIT AND FREQUENCY-CORRECTING OSCILLATION CIRCUIT - An oscillation circuit includes: an oscillator that includes a vibrator and outputs an oscillation signal; an F/V converter that converts the oscillation signal into a voltage corresponding to a frequency of the oscillation signal; and a memory circuit that stores frequency correcting information for correcting the frequency of the oscillation signal. | 09-01-2011 |
20130257550 | CIRCUIT DEVICE, OSCILLATION DEVICE, AND ELECTRONIC APPARATUS - A circuit device includes a current supply circuit adapted to supply an oscillation current, an oscillation circuit having an oscillation transistor for a resonator, and adapted to drive the resonator using the oscillation transistor based on an oscillation current from the current supply circuit, and a control section adapted to control the current supply circuit. If the oscillation circuit is set to an overdrive mode, the oscillation circuit drives the resonator with a higher drive power than the drive power in a normal mode. | 10-03-2013 |
20140091865 | OSCILLATION CIRCUIT, ELECTRONIC APPARATUS, AND MOVING OBJECT - An oscillation circuit is connected to a resonator element (crystal resonator) and oscillates a resonator element to output an oscillation signal. The oscillation circuit includes an amplification element (inverter), and a set of variable capacitive elements having at least two variable capacitive elements, which are connected to an oscillation loop from an output to an input of the amplification element and the capacitance values thereof are controlled with potential differences between reference voltages and a variable control voltage. In each variable capacitive element of a set of variable capacitive elements, the common control voltage is applied to one terminal, and the reference voltage which differs between the variable capacitive elements is input to the other terminal. | 04-03-2014 |
20140091868 | OSCILLATION CIRCUIT, SEMICONDUCTOR INTEGRATED CIRCUIT DEVICE, VIBRATING DEVICE, ELECTRONIC APPARATUS, AND MOVING OBJECT - An oscillation circuit includes a first variable capacitance part which includes a first variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a first reference voltage, and is connected to the oscillation circuit, a second variable capacitance part which includes a second variable capacitance element whose capacitance is controlled on the basis of a potential difference between a first control voltage and a second reference voltage, and is connected to the oscillation circuit. If composite capacitance in the first variable capacitance part excluding the first variable capacitance element is first composite capacitance, composite capacitance in the second variable capacitance part excluding the second variable capacitance element is second composite capacitance, and if the second composite capacitance is greater than the first composite capacitance, the second variable capacitance element having capacitance greater than the first variable capacitance element is used. | 04-03-2014 |
20150116043 | OSCILLATION CIRCUIT, OSCILLATOR, METHOD OF MANUFACTURING OSCILLATOR, ELECTRONIC DEVICE, AND MOVING OBJECT - An oscillation circuit includes a terminal XO which is connected to one end of a resonator, a terminal XI which is connected to the other end of the resonator, an oscillation unit which is electrically connected to the terminal XO and the terminal XI, a control voltage generation circuit, and a switch. The oscillation unit includes a variable capacitive element having one end which is connected to the terminal XO or the terminal XI. The switch controls electrical connection between the other end of the variable capacitive element and an output terminal of the control voltage generation circuit. | 04-30-2015 |
20150116044 | OSCILLATION CIRCUIT, OSCILLATOR, MANUFACTURING METHOD OF OSCILLATOR, ELECTRONIC DEVICE, AND MOVING OBJECT - An oscillation circuit includes: an oscillation unit which includes a first terminal and a second terminal connected to a resonator, a third terminal, a fourth terminal to which at least one of a power supply potential and a signal for inspecting the resonator is applied, a first switching unit which switches modes of electrical connection between the first terminal and the third terminal, and a second switching unit which switches modes of electrical connection between the second terminal and the fourth terminal. | 04-30-2015 |
20150116045 | OSCILLATION CIRCUIT, OSCILLATOR, METHOD OF MANUFACTURING OSCILLATOR, ELECTRONIC DEVICE, AND MOVING OBJECT - An oscillation circuit includes a terminal XO, a terminal XI, an oscillation unit, and a voltage generation circuit that generates a first voltage and a second voltage. The oscillation unit includes a variable capacitive element connected to the terminal XO or the terminal XI. In a first mode, a signal having a first amplitude is applied between the terminal XO and the terminal XI, and a first voltage is applied to the other end of the variable capacitive element. In a second mode, a signal having a second amplitude larger than an amplitude of the signal having the first amplitude is applied between the terminal XO and the terminal XI, a second voltage is applied to the other end of the variable capacitive element, and a voltage applied to the both ends of the variable capacitive element is lower than the maximum rated voltage of the variable capacitive element. | 04-30-2015 |
20150116048 | OSCILLATION CIRCUIT, OSCILLATOR, MANUFACTURING METHOD OF OSCILLATOR, ELECTRONIC DEVICE, AND MOVING OBJECT - An oscillation circuit includes: an oscillation unit which includes a first terminal and a second terminal connected to a vibrator; a third terminal to which a ground potential is supplied; a fourth terminal which is electrically connected to the second terminal, and to which at least one of an AC voltage for driving the vibrator and a voltage for operating the oscillation unit is applied; and a first switching unit which switches modes of electrical connection between the first terminal and the third terminal. | 04-30-2015 |