Circuit device, oscillator, electronic apparatus, and moving object

Patent metadata

Field	Value
Publication number	US-2017194965-A1
Application number	US-201615386494-A
Country	US
Kind code	A1
Filing date	Dec 21, 2016
Priority date	Jan 6, 2016
Publication date	Jul 6, 2017
Grant date	—

Abstract

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.

First claim

What is claimed is:

1 . A circuit device comprising:
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.

2 . The circuit device according to claim 1 further comprising:
an A/D converter adapted to perform A/D conversion on a temperature detection voltage from the external temperature sensor to output the temperature detection data.

3 . The circuit device according to claim 2 further comprising:
an input terminal adapted to input the temperature detection voltage.

4 . The circuit device according to claim 3 further comprising:
a programmable gain amplifier connected to the input terminal,
wherein the temperature detection voltage is input from the input terminal to the A/D converter via the programmable gain amplifier.

5 . The circuit device according to claim 2 further comprising:
a digital filter connected to the A/D converter,
wherein the temperature detection data output from the A/D converter is input to the processor via the digital filter.

6 . The circuit device according to claim 2 further comprising:
an internal temperature sensor,
wherein the A/D converter performs A/D conversion on an internal temperature detection voltage from the internal temperature sensor in a first mode, and performs A/D conversion on the temperature detection voltage from the external temperature sensor in a second mode.

7 . The circuit device according to claim 1 , wherein
the processor extracts an aging variation component from variation components of the frequency control data including the aging variation component and a temperature variation component based on the temperature detection data, and then performs an aging correction process of the frequency control data based on the aging variation component extracted.

8 . The circuit device according to claim 1 further comprising:
an oven control circuit adapted to control a heater disposed in the thermostatic oven.

9 . An oscillator comprising:
an external temperature sensor disposed outside a circuit device; a thermostatic oven; a resonator disposed in the thermostatic oven; a heater disposed in the thermostatic oven; and a circuit device including
a processor adapted to perform a signal processing of temperature compensation of an oscillation frequency based on temperature detection data from the external temperature sensor 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 the resonator.

10 . The oscillator according to claim 9 , wherein
defining a distance between the resonator and the circuit device as L 1 , and a distance between the resonator and the external temperature sensor as L 2 , L 2 >L 1 is true.

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

12 . A moving object comprising:
the circuit device according to claim 1 .

13 . A device to control oscillation frequency, the device comprising:
an oscillation signal generation circuit disposed within a package having an oscillator and configured to control an oscillation frequency of the oscillator; an external temperature sensor disposed outside of the package; and a processor configured to receive temperature detection data from the external temperature sensor, the temperature detection data comprising ambient temperature data measured outside of the package by the external temperature sensor, the processor further configured to perform a temperature compensation process to control the oscillation signal generation circuit using the temperature detection data to cause the oscillation signal generation circuit to change the oscillation frequency of the oscillator based on a change in the temperature detection data.

14 . The device according to claim 13 , wherein the processor is further configured to perform an aging correction process for controlling the oscillation frequency of the oscillator over time.

15 . The device according to claim 13 , further comprising:
a programmable gain amplifier, wherein the processor is further configured to control a gain of the programmable gain amplifier in accordance with a position wherein the external temperature sensor is disposed.

16 . The device according to claim 13 , further comprising:
a digital filter configured to filter noise in the temperature detection data.

17 . The device according to claim 13 , further comprising:
an internal temperature sensor disposed within the package, the processor further configured to control the oscillation frequency of the oscillator in a first mode using the temperature detection data from the external temperature sensor and in a second mode using temperature detection data from the internal temperature sensor.

18 . The device according to claim 17 , wherein the first mode defines a highly accurate oscillation frequency mode and the second mode defines a normal oscillation frequency mode, wherein control of the oscillation frequency in the highly accurate oscillation frequency mode is more accurate than in the normal oscillation frequency mode.

19 . The device according to claim 13 , wherein the package is a semiconductor chip.

20 . The device according to claim 13 , wherein the package is disposed inside a thermostatic oven and the external temperature sensor is disposed outside the thermostatic oven.

Assignees

• Seiko Epson Corp

Inventors

• Yonezawa Takemi

Classifications

• H03B5/32

  being a piezoelectric resonator (selection of piezoelectric material H10N30/00) · CPC title

• H03L1/02 Primary

  against variations of temperature only · CPC title

• H03L1/022 Primary

  by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature (H03L1/021 takes precedence) · CPC title

• H03L7/0991

  the oscillator being a digital oscillator, e.g. composed of a fixed oscillator followed by a variable frequency divider (H03L7/0995 takes precedence; fixed oscillators with means for selecting among various phases H03L7/0814) · CPC title

• H03L1/00 Primary

  Stabilisation of generator output against variations of physical values, e.g. power supply · CPC title