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Patent Searching and Data


Title:
DIGITAL TEMPERATURE COMPENSATED OSCILLATOR
Document Type and Number:
Japanese Patent JPH10163751
Kind Code:
A
Abstract:

To prevent the temperature compensating operation of temperature compensated oscillator from disturbing auto-frequency control(AFC) operation to a received signal.

This temperature compensated oscillator has a temperature sensor 1 to change its output corresponding to the surrounding temperature, address generating part 2 for generating a read only memory(ROM) address by converting the output of temperature sensor, ROM 3 storing a control voltage for compensating frequency fluctuation caused by the surrounding temperature of voltage controlled crystal oscillator, latch means 4 for holding or passing the output data of ROM according to a control signal from the outside, D/A converter 5 for generating the control voltage of voltage controlled crystal oscillator corresponding to the output of latch means 4, and voltage controlled crystal oscillator 9 to precisely adjust its transmission frequency corresponding to two control voltages of D/A converter output and an analog AFC signal 700 inputted from the outside.


Inventors:
TSUMURA SOICHI
Application Number:
JP1996000317544
Publication Date:
June 19, 1998
Filing Date:
November 28, 1996
Export Citation:
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Assignee:
NEC CORP
International Classes:
H03B5/32; H03J7/08; H03L1/02; H03B5/36; (IPC1-7): H03B5/32
Attorney, Agent or Firm:
京本 直樹 (外2名)