Circuit device, oscillator, electronic apparatus, and vehicle

Patent metadata

Field	Value
Publication number	US-2017194968-A1
Application number	US-201615385400-A
Country	US
Kind code	A1
Filing date	Dec 20, 2016
Priority date	Jan 6, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

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.

First claim

What is claimed is:

1 . A circuit device comprising:
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 that is configured to;
perform a signal process on input frequency control data to output frequency control data; and
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.

2 . The circuit device according to claim 1 ,
wherein the environmental change component information includes temperature change component information.

3 . The circuit device according to claim 2 ,
wherein the processor is configured to acquire the frequency control data from which the temperature change component is removed by using the temperature change component information, and perform the aging correction on the basis of the frequency control data from which the temperature change component is removed.

4 . The circuit device according to claim 2 ,
wherein the processor is configured to acquire the temperature change component information on the basis of temperature detection data which is obtained by using a temperature detection voltage from a temperature sensor.

5 . The circuit device according to claim 1 ,
wherein the processor is configured to estimate a true value of the frequency control data by performing a Karman filter process on the frequency control data from which the environmental change component is removed, and performs the aging correction on the basis of the true value.

6 . The circuit device according to claim 5 ,
wherein the processor is configured to
perform the signal process on the input frequency control data which is based on a phase comparison result between an input signal based on the oscillation signal and a reference signal,
estimate a true value, through a Karman filter process, in a period before a hold-over state due to the absence or abnormality of the reference signal is detected, for an observed value of the frequency control data from which the environmental change component is removed, 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.

7 . The circuit device according to claim 6 ,
wherein the processor is configured to generate the aging-corrected frequency control data by performing the calculation of adding the correction value to the true value.

8 . The circuit device according to claim 7 ,
wherein the processor is configured to perform the calculation of adding the correction value after a filter process to the true value.

9 . The circuit device according to claim 7 ,
wherein the processor is configured to obtains the correction value on the basis of an observation residual in the Karman filter process.

10 . The circuit device according to claim 5 , further comprising:
a storage that stores a system noise constant for setting system noise in the Karman filter process and an observation noise constant for setting observation noise in the Karman filter process.

11 . An oscillator comprising:
the circuit device according to claim 1 ; and the resonator.

12 . An electronic apparatus comprising the circuit device according to claim 1 .

13 . A vehicle comprising the circuit device according to claim 1 .

Assignees

• Seiko Epson Corp

Inventors

• Yonezawa Takemi

Classifications

• H03L7/085

  concerning mainly the frequency- or phase-detection arrangement including the filtering or amplification of its output signal (H03L7/10 takes precedence; circuits for comparing the phase or frequency of two mutually-independent oscillations H03D13/00) · CPC title

• H03B2201/0291

  and being controlled by a processing device, e.g. a microprocessor · CPC title

• H03B5/24

  active element in amplifier being semiconductor device (H03B5/26 takes precedence) · CPC title

• H03L1/026 Primary

  by using a memory for digitally storing correction values (H03L1/025 takes precedence) · CPC title

• H03B5/362

  the amplifier being a single transistor (H03B5/364 - H03B5/368 take precedence) · CPC title