Title:
FUNCTION GENERATION CIRCUIT, CRYSTAL OSCILLATION DEVICE, AND METHOD OF ADJUSTING THE CRYSTAL OSCILLATION DEVICE
Document Type and Number:
WIPO Patent Application WO/1999/003195
Kind Code:
A1
Abstract:
A crystal oscillation device with a temperature compensation function comprising: a constant voltage circuit (12) for outputting a predetermined voltage that does not depend on the ambient temperature; a temperature sensor circuit (13) for outputting a voltage proportional to the ambient temperature; and a control circuit (14) for generating a control voltage (Vc) which receives a constant voltage output of the constant voltage circuit (12) and a voltage output of the temperature sensor circuit (13) proportional to temperature and which performs polygonal line approximation, by using a continuous line, of a negative cubic curve for compensating for the temperature characteristic of a crystal oscillator over the entire range of the ambient temperature. The crystal oscillation device further includes a VCXO (15) whose oscillation frequency is controlled to a predetermined value by the control voltage (Vc), and a ROM/RAM circuit (16) where a temperature compensation parameter for compensating for the temperature characteristic of the control voltage (Vc) which is outputted by the control circuit (14) and used to optimize the oscillation frequency outputted by the VCXO (15) is stored.
Inventors:
SHIBUYA SHUJI (JP)
TAKEUCHI HISATO (JP)
MATSUURA JUNICHI (JP)
TATEYAMA YUICHI (JP)
SAEKI TAKAHARU (JP)
TAKEUCHI HISATO (JP)
MATSUURA JUNICHI (JP)
TATEYAMA YUICHI (JP)
SAEKI TAKAHARU (JP)
Application Number:
PCT/JP1998/003062
Publication Date:
January 21, 1999
Filing Date:
July 08, 1998
Export Citation:
Assignee:
MATSUSHITA ELECTRIC IND CO LTD (JP)
SHIBUYA SHUJI (JP)
TAKEUCHI HISATO (JP)
MATSURA JUNICHI (JP)
TATEYAMA YUICHI (JP)
SAEKI TAKAHARU (JP)
SHIBUYA SHUJI (JP)
TAKEUCHI HISATO (JP)
MATSURA JUNICHI (JP)
TATEYAMA YUICHI (JP)
SAEKI TAKAHARU (JP)
International Classes:
G06G7/12; G06G7/26; H03B5/32; H03B5/04; H03B5/36; H03L1/02; H03B1/00; (IPC1-7): H03B5/32; G06G7/12
Foreign References:
| JPS48101860A | 1973-12-21 | |||
| JPH09153104A | 1997-06-10 | |||
| JPH08116214A | 1996-05-07 | |||
| JPH01265708A | 1989-10-23 |
Other References:
See also references of EP 0998022A4
Attorney, Agent or Firm:
Maeda, Hiroshi (Utsubohonmachi 1-chome Nishi-ku Osaka-shi Osaka, JP)
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