Oscillator, electronic apparatus, and moving object

Patent metadata

Field	Value
Publication number	US-9537448-B2
Application number	US-201615013160-A
Country	US
Kind code	B2
Filing date	Feb 2, 2016
Priority date	Feb 4, 2015
Publication date	Jan 3, 2017
Grant date	Jan 3, 2017

Abstract

An oscillator includes: an oscillation circuit whose oscillation frequency changes based on a voltage that is applied to a variable capacitance element; and a voltage generation unit that generates the voltage which is applied to the variable capacitance element based on a control signal, in which the voltage that is generated by the voltage generation unit changes nonlinearly with respect to a change in the control signal such that a change in the oscillation frequency with respect to the change in the control signal is adjusted to come close to be linear.

First claim

What is claimed is:

1. An oscillator comprising:
an oscillation circuit that includes a variable capacitance element and whose oscillation frequency changes based on a voltage that is applied to the variable capacitance element; and
a voltage generation unit that generates the voltage which is applied to the variable capacitance element based on a control signal, wherein the voltage generation unit includes a D/A conversion circuit and the control signal is a digital signal,
wherein the voltage that is generated by the voltage generation unit changes nonlinearly with respect to a change in the control signal such that a change in the oscillation frequency with respect to the change in the control signal is adjusted to come close to being linear.

2. The oscillator according to claim 1 ,
wherein an output voltage of the D/A conversion circuit changes nonlinearly with respect to a change in an input signal.

3. An electronic apparatus comprising:
the oscillator according to claim 2 .

4. A moving object comprising:
the oscillator according to claim 2 .

5. The oscillator according to claim 1 ,
wherein an output voltage of the D/A conversion circuit changes linearly with respect to a change in an input signal, and
wherein the voltage generation unit includes a signal conversion unit that converts the control signal into a signal that changes nonlinearly with respect to the change in the control signal and outputs the signal to the D/A conversion circuit.

6. The oscillator according to claim 5 ,
wherein the signal conversion unit converts the control signal into the signal that changes nonlinear, using a lookup table.

7. An electronic apparatus comprising:
the oscillator according to claim 6 .

8. A moving object comprising:
the oscillator according to claim 6 .

9. An electronic apparatus comprising:
the oscillator according to claim 5 .

10. A moving object comprising:
the oscillator according to claim 5 .

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

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

13. An oscillator comprising:
an oscillation circuit that includes a variable capacitance element and whose oscillation frequency changes based on a voltage that is applied to the variable capacitance element; and
a voltage generation unit that generates the voltage which is applied to the variable capacitance element based on a control signal, wherein:
the control signal is an analog signal, and
the voltage generation unit includes
an A/D conversion circuit that converts the control signal into a digital signal, and
a D/A conversion circuit that converts the digital signal converted by the A/D conversion circuit into the voltage that is applied to the variable capacitance element,
wherein the A/D conversion circuit converts the control signal into the digital signal that changes nonlinearly with respect to the change in the control signal.

14. An electronic apparatus comprising:
the oscillator according to claim 13 .

15. A moving object comprising:
the oscillator according to claim 13 .

16. An oscillator comprising:
an oscillation circuit that includes a variable capacitance element and whose oscillation frequency changes based on a voltage that is applied to the variable capacitance element; and
a voltage generation unit that generates the voltage which is applied to the variable capacitance element based on a control signal, wherein:
the control signal is an analog signal,
the voltage generation unit includes
an A/D conversion circuit that converts the control signal into a digital signal, and
a D/A conversion circuit that converts the digital signal converted by the A/D conversion circuit into the voltage that is applied to the variable capacitance element, and

wherein the D/A conversion circuit converts the digital signal converted by the A/D conversion circuit into the voltage that changes nonlinearly with respect to the change in the digital signal.

Assignees

• Seiko Epson Corp

Inventors

• Fukuzawa Akihiro

Classifications

• H03B5/32 Primary

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

• H03L2207/05

  Compensating for non-linear characteristics of the controlled oscillator · CPC title

• H03B2200/0092

  Measures to linearise or reduce distortion of oscillator characteristics · CPC title

• H03B2201/0266

  the means comprising a transistor · CPC title

• H03B5/124

  the means comprising a voltage dependent capacitance · CPC title