Oscillation circuit, electronic apparatus, and moving object

Patent metadata

Field	Value
Publication number	US-10128854-B2
Application number	US-201615245774-A
Country	US
Kind code	B2
Filing date	Aug 24, 2016
Priority date	Aug 28, 2015
Publication date	Nov 13, 2018
Grant date	Nov 13, 2018

Abstract

An oscillation circuit includes an oscillating circuit adapted to oscillate a resonator element having a frequency-temperature characteristic, and a frequency adjustment circuit having a capacitance circuit connected to the oscillating circuit and adapted to adjust an oscillation frequency of the oscillating circuit, and a logic circuit, to which a signal having been output from the oscillating circuit is input, and which adjusts a frequency of the signal, and the frequency adjustment circuit compensates the frequency-temperature characteristic using at least the capacitance circuit in a predetermined temperature range, and compensates the frequency-temperature characteristic using the logic circuit alone outside the predetermined temperature range.

First claim

What is claimed is:

1. An oscillation circuit comprising:
an oscillating circuit adapted to oscillate a resonator element having a frequency-temperature characteristic; and
a frequency adjustment circuit having a capacitance circuit connected to the oscillating circuit and adapted to adjust an oscillation frequency of the oscillating circuit, and a logic circuit, to which a signal having been output from the oscillating circuit is input, and which adjusts a frequency of the signal, wherein:
the frequency adjustment circuit is configured to compensate the frequency-temperature characteristic using at least the capacitance circuit in a first predetermined temperature range,
the frequency adjustment circuit is configured to compensate the frequency-temperature characteristic using the logic circuit alone outside the first predetermined temperature range,
a minimum limit of the first predetermined temperature range is adjustable, and
a maximum limit of the first predetermined temperature range is adjustable.

2. The oscillation circuit according to claim 1 , wherein
the frequency adjustment circuit compensates the frequency-temperature characteristic using the capacitance circuit and the logic circuit in the first predetermined temperature range.

3. The oscillation circuit according to claim 1 , wherein
the frequency-temperature characteristic has a characteristic of a quadratic function with respect to a temperature of the resonator element; and
the first predetermined temperature range includes a temperature corresponding to a peak of the quadratic function.

4. The oscillation circuit according to claim 2 , wherein
the frequency-temperature characteristic has a characteristic of a quadratic function with respect to a temperature of the resonator element; and
the first predetermined temperature range includes a temperature corresponding to a peak of the quadratic function.

5. The oscillation circuit according to claim 1 , wherein
the frequency adjustment circuit corrects a frequency variation other than the frequency-temperature characteristic using the logic circuit.

6. The oscillation circuit according to claim 2 , wherein
the frequency adjustment circuit corrects a frequency variation other than the frequency-temperature characteristic using the logic circuit.

7. The oscillation circuit according to claim 3 , wherein
the frequency adjustment circuit corrects a frequency variation other than the frequency-temperature characteristic using the logic circuit.

8. The oscillation circuit according to claim 4 , wherein
the frequency adjustment circuit corrects a frequency variation other than the frequency-temperature characteristic using the logic circuit.

9. The oscillation circuit according to claim 5 , wherein
the frequency variation other than the frequency-temperature characteristic is a temporal frequency variation of the resonator element.

10. An electronic apparatus comprising:
the oscillation circuit according to claim 1 .

11. A moving object comprising:
the oscillation circuit according to claim 1 .

12. The oscillation circuit according to claim 1 , wherein:
the first predetermined temperature range is adjustable to a second predetermined temperature range;
the minimum limit of the second predetermined temperature range is greater than the minimum limit of the first predetermined temperature range; and
the maximum limit of the second predetermined temperature range is less than the maximum limit of the first predetermined temperature range.

13. The oscillation circuit according to claim 1 , wherein:
the first predetermined temperature range is adjustable to a second predetermined temperature range;
the minimum limit of the second predetermined temperature range is less than the minimum limit of the first predetermined temperature range; and
the maximum limit of the second predetermined temperature range is greater than the maximum limit of the first predetermined temperature range.

14. An oscillation circuit comprising:
an oscillating circuit adapted to oscillate a resonator element having a frequency-temperature characteristic; and
a frequency adjustment circuit having a capacitance circuit connected to the oscillating circuit and adapted to adjust an oscillation frequency of the oscillating circuit, and a logic circuit, to which a signal having been output from the oscillating circuit is input, and which adjusts a frequency of the signal, wherein:
the frequency adjustment circuit is configured to compensate the frequency-temperature characteristic using the capacitance circuit in a first predetermined temperature range,
the frequency adjustment circuit is configured to compensate the frequency-temperature characteristic using the logic circuit in a second predetermined temperature range, and
the second predetermined temperature range is different from the first predetermined temperature range.

Assignees

• Seiko Epson Corp

Inventors

• Shirotori Toru
• Yamaguchi Hisashi
• Wakamori Masaki
• Usuda Toshiya
• Matsuzaki Sho
• Yoneyama Tsuyoshi
• Kamiyama Masayuki
• Kiya Hiroshi

Classifications

• H03B5/1234

  and comprising means for varying the output amplitude of the generator (H03B5/1278 takes precedence) · CPC title

• H03L1/026

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

• H03L1/04 Primary

  Constructional details for maintaining temperature constant · CPC title

• H03B5/1265

  switched capacitors · CPC title

• H03B5/32

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