Seiko Epson Corporation

Takemi Yonezawa

Takayuki Kikuchi

Hideo Haneda

Fumikazu Komatsu

Kensaku Isohata

Mitsuaki Sawada

Hidehiko Yajima

Noriyuki Murashima

Kenichi Oe

Kenji Hayashi

Kimio Nagasaka

Yoshiyuki Maki

Yukihiro Hashi

Tomohiro Uno

Masaaki Abe

Masaaki Okubo

Tetsuhiro Yamada

An atomic oscillator includes an atom cell that includes walls defining an internal space in which alkali metal atoms are contained, a light emitting element that emits light for exciting the alkali metal atoms, and a light detecting element that detects the light transmitted through the atom cell, in which the atom cell includes a first portion in which gaseous alkali metal atoms are contained and through which light from the light emitting element passes along an x-axis, a second portion in which liquid or solid alkali metal atoms are contained, and a third portion that is positioned between the first portion and the second portion and couples the first portion and the second portion, and in the third portion, a distance between two walls facing each other along a y-axis orthogonal to the x-axis decreases from the first portion toward the second portion along the y-axis at a constant decrease rate.

Atomic oscillator and frequency signal generation system

An oscillator includes an oscillation source, multiple temperature control elements, and a controller adapted to perform control to suppress an increase in current consumed in one or more of the temperature control elements during at least part of a period from when operation of the oscillation source initiates to when the oscillation source reaches a specified temperature.

Oscillator, electronic apparatus, and base station

A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency, the oscillation frequency being a frequency set by using frequency control data, and a processor that is configured to perform a signal process on input frequency control data, and. The processor is configured to acquire the frequency control data from which an environmental change component is removed of the environmental change component and an aging change component by using environmental change component information, and perform aging correction on the basis of the frequency control data from which the environmental change component is removed.

Circuit device, oscillator, electronic apparatus, and vehicle

A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency set by the frequency control data by using a resonator, and a processor that is configured to perform a signal process on input frequency control data to output frequency control data. The processor is configured to obtain a pre-estimated value x^(k) at a time step k by adding a post-estimated value x^(k&#x2212;1) and a correction value D(k&#x2212;1) at a time step k&#x2212;1 together during a process of updating a pre-estimated value in a Kalman filter process, and perform aging correction on the frequency control data on the basis of a result of the Kalman filter process.

A circuit device includes an oscillation signal generation circuit that generates an oscillation signal having an oscillation frequency using a resonator, the oscillation frequency being a frequency set by using frequency control data, and a processor configured to perform a signal process on input frequency control data based on a phase comparison result between an input signal based on the oscillation signal and a reference signal. The processor is configured to estimate a true value for an observed value of the frequency control data based on the phase comparison result through a Kalman filter process in a period before a hold-over state is detected, and generate aging-corrected frequency control data, in a case where the hold-over state is detected, by holding the true value at a timing corresponding to a timing of detecting the hold-over state, and by performing a calculation based on the true value.

A circuit device includes a processor adapted to perform a signal processing of temperature compensation of an oscillation frequency based on temperature detection data from an external temperature sensor disposed outside the circuit device to output frequency control data, and an oscillation signal generation circuit adapted to generate an oscillation signal with the oscillation frequency corresponding to the frequency control data using the frequency control data and a resonator disposed in a thermostatic oven.

Circuit device, oscillator, electronic apparatus, and moving object

A circuit device includes a digital interface, a processor, an oscillation signal generation circuit, a clock signal generation circuit that generates a clock signal having frequency obtained through multiplication of a frequency of the oscillation signal, and terminal groups of the digital interface and the clock signal generation circuit. The terminal group of the digital interface is disposed in a first region along a first side of the circuit device, and the terminal group of the clock signal generation circuit is disposed in any one of second, third and fourth regions of the circuit device.

A circuit device includes an oscillation signal generation circuit, a reference signal input terminal to which a reference signal is input, and an internal phase comparator that performs phase comparison between an input signal based on the oscillation signal and the reference signal. The oscillation signal generation circuit generates the oscillation signal using the frequency control data based on a result of the phase comparison from an external phase comparator which performs phase comparison between an input signal based on the oscillation signal and the reference signal in a first mode, and generates the oscillation signal using the frequency control data based on a result of the phase comparison from the internal phase comparator in a second mode.

A physical quantity sensor includes a physical quantity sensor element and an IC connected to the physical quantity sensor element. The IC includes an analog power supply circuit that is switched to enable or disable, a signal processing unit to which a voltage is supplied from the analog power supply circuit and which processes a signal from the physical quantity sensor element, and a control circuit that sets the analog power supply circuit to enable within a processing period based on an external trigger and makes the signal processing unit process a physical quantity signal from the physical quantity sensor element intermittently for every processing period.

Physical quantity sensor, sensor unit, electronic apparatus, moving object, and physical quantity detection method

An oscillator includes a resonator; an oscillation circuit which oscillates the resonator; a D/A conversion circuit which receives digital data for controlling a frequency of the oscillation circuit; a first temperature sensor; and a temperature compensation circuit which is connected to the first temperature sensor. The oscillation circuit includes a first variable capacitor element and a second variable capacitor element. An output voltage of the D/A conversion circuit is applied to the first variable capacitor element. An output voltage of the temperature compensation circuit is applied to the second variable capacitor element.

Oscillator, electronic apparatus, and moving object

A physical quantity detecting sensor includes a physical quantity detecting sensor element and an IC connected to the physical quantity detecting sensor element. The IC includes: a logic circuit; an analog circuit; a first regulator that supplies a logic power supply voltage generated based on a power supply voltage to the logic circuit; a second regulator that is switched to enable or disable and supplies an analog power supply voltage, which is generated based on the power supply voltage when the second regulator is set to enable, to the analog circuit; and a switch for supplying the logic power supply voltage to the analog circuit when the second regulator is set to disable.

Physical quantity detecting sensor, electronic apparatus, moving object, and electronic circuit

An impact detection circuit includes a first detection section adapted to detect presence or absence of an impact input based on a first output signal as an output signal in a first detection axis of an inertial sensor having the first detection axis and a second detection axis different from each other, a second detection section adapted to detect presence or absence of an impact input based on a second output signal as an output signal in the second detection axis, and an impact detection determination section adapted to determine that an impact input has been made in a case in which both of the first detection section and the second detection section have detected the presence of the impact input.

Impact detection circuit for physical quantity detection device to detect impact to electronic apparatus, moving object, and impact detection method

An oscillator includes an oscillation element, an oscillation circuit, a heat generation element, a temperature control circuit, and a temperature correction signal generation circuit adapted to generate a temperature correction signal used to correct a frequency-temperature characteristic. The temperature correction signal generation circuit includes a temperature sensor, a first-order correction signal generation circuit adapted to generate a first-order correction signal, and a high-order correction signal generation circuit adapted to generate a high-order correction signal. The high-order correction signal generation circuit includes a high-temperature side second-order correction signal generation circuit, a high-temperature side polarity switching circuit adapted to switch a polarity of a high-temperature side second-order correction signal, a low-temperature side second-order correction signal generation circuit, and a low-temperature side polarity switching circuit adapted to switch a polarity of a low-temperature side second-order correction signal.

A D/A conversion circuit includes a first D/A converting section which is connected with an output node, a first serial capacitor which is disposed between the output node and a first node, a second D/A converting section which is connected with the first node, and a control circuit. The first D/A converting section includes a first capacitor array section and a first switch array section. The second D/A converting section includes a second capacitor array section and a second switch array section. The control circuit performs a switch control for dynamically changing allocation of the capacitors to the respective bits of input digital data for the first switch array section of the first D/A converting section.

Growing community of inventors

Minowa-machi, Japan

Takemi Yonezawa