Oscillator that uses thermostatic oven

a thermostatic oven and oscillator technology, applied in the field of oscillators, can solve problems such as equipment failure, increase in a substantial rise time, and frequency increas

Inactive Publication Date: 2001-11-15
NIHON DEMPA KOGYO CO LTD
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Once a ringing phenomenon occurs, the time required for stabilization of the oscillation frequency increases, and this increases a substantial rise time.
In an extreme case, a ringing phenomenon so continues as to cause a failure of equipment.
H

Method used

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  • Oscillator that uses thermostatic oven
  • Oscillator that uses thermostatic oven
  • Oscillator that uses thermostatic oven

Examples

Experimental program
Comparison scheme
Effect test

Embodiment Construction

[0027] Next, preferred embodiments of the present invention will be described with reference to the drawings.

[0028] An oven-controlled oscillator of a preferred embodiment of the present invention shown in FIG. 7 has a similar configuration to that of the conventional oven-controlled oscillator shown in FIGS. 1 to 4 and includes crystal oscillation circuit 10 of a Colpitts type circuit configuration, thermostatic oven 1 in which quartz-crystal element 3 is accommodated, heater 6 for heating the inside of thermostatic oven 1, and heat source control circuit 2 for controlling current to flow through heater 6. The oven-controlled oscillator of the present embodiment, however, is different from the conventional oven-controlled oscillator in that heat source control circuit 2 has a different circuit configuration. FIG. 8 shows the circuit configuration of heat source control circuit 2 in the oven-controlled oscillator of the present embodiment. In FIGS. 7 and 8, the same components to th...

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PUM

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Abstract

An oven-controlled oscillator includes a thermostatic oven having a heat source, a vibrator provided in the thermostatic oven, an oscillation circuit for generating an oscillation signal in response to an action of the vibrator, and a heat source control circuit. The heat source control circuit includes a sensor for detecting an internal temperature of the thermostatic oven, an operational amplifier for controlling current to flow through the heat source in response to a resistance value of the sensor so that the internal temperature of the thermostatic oven may be maintained at a predetermined preset temperature, and a feedback resistor for the operational amplifier. The feedback resistor includes a thermistor whose resistance value drops as the temperature rises, and the thermistor is thermally coupled to the thermostatic oven. Preferably, a quartz-crystal element is used as the vibrator.

Description

[0001] 1. Technical Field to Which the Invention Pertains[0002] This invention relates to an oscillator wherein a thermostatic oven is used to stabilize the oscillation frequency, and more particularly to a quartz-crystal oscillator wherein an operational amplifier is used to control a heat source of a thermostatic oven.[0003] 2. Background Art[0004] From among oscillators which employ a quartz-crystal element, an oven-controlled oscillator wherein a vibrator such as a quartz-crystal element is held in a thermostatic oven has a stabilized oscillation frequency against a variation of the ambient temperature because an oscillation circuit operates with the quartz-crystal element or the like kept at a constant temperature. The oven-controlled oscillator is used particularly for applications for which a high frequency stability is required such as a comparatively high grade communication apparatus used in a base station of a mobile communication system, for example.[0005] The oven-contr...

Claims

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Application Information

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IPC IPC(8): G04F5/04H03B5/04H03B5/32H03B5/36
CPCG04F5/04H03B5/04H03B5/362
Inventor HASHIMOTO, HIDEOUCHIDA, TAKESHI
Owner NIHON DEMPA KOGYO CO LTD
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