Title:
CRYSTAL OSCILLATOR AND OSCILLATION APPARATUS
Document Type and Number:
Japanese Patent JP2014200012
Kind Code:
A
Abstract:
PROBLEM TO BE SOLVED: To provide a crystal oscillator (OCXO), generating a temperature detection value on the basis of a signal corresponding to difference between oscillatory frequencies of a first and a second crystal oscillators, capable of optimizing the scale of a circuit for performing temperature control.SOLUTION: If oscillation outputs of a first and a second crystal oscillators 10, 20 are taken as f1, f2 and oscillatory frequencies of the oscillation outputs at reference temperature are taken as f1r, f2r respectively, a frequency difference detection section 3 arithmetically processes {(f2-f1)/f1}-{(f2r-f1r)/f1r} to obtain a digital value. At the subsequent stage of the arithmetically processed part, there are provided an accumulation section that accumulates the digital value each time a clock input is made and a rounding process 75 that rounds an accumulated digital value. The accumulation number and the rounding amount can be mutually set independently.
Inventors:
AKAIKE KAZUO
KOBAYASHI KAORU
KOBAYASHI KAORU
Application Number:
JP2013074854A
Publication Date:
October 23, 2014
Filing Date:
March 29, 2013
Export Citation:
Assignee:
NIHON DEMPA KOGYO CO
International Classes:
H03B5/32; H03B5/02; H03B5/04; H03L1/02; H03L1/04; H03L7/08
Domestic Patent References:
| JP2013051677A | 2013-03-14 | |||
| JPH0468903A | 1992-03-04 | |||
| JPH0856153A | 1996-02-27 | |||
| JP2008176744A | 2008-07-31 | |||
| JPH02141015A | 1990-05-30 |
Attorney, Agent or Firm:
Toshio Inoue
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