Title:
DIGITAL TEMPERATURE COMPENSATED OSCILLATOR
Document Type and Number:
Japanese Patent JP3050146
Kind Code:
B2
Abstract:
PROBLEM TO BE SOLVED: To prevent the temperature compensating operation of temperature compensated oscillator from disturbing auto-frequency control(AFC) operation to a received signal.
SOLUTION: 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:
Souichi Tsumura
Application Number:
JP31754496A
Publication Date:
June 12, 2000
Filing Date:
November 28, 1996
Export Citation:
Assignee:
NEC
International Classes:
H03B5/32; H03J7/08; H03L1/02; H03B5/36; (IPC1-7): H03B5/32
Domestic Patent References:
| JP193904A | ||||
| JP1136401A | ||||
| JP3126306A | ||||
| JP5574222A |
Attorney, Agent or Firm:
Naoki Kyomoto (2 outside)
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