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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.
However, the method of decreasing the amplification factor A gives rise to increase of the time required until the internal temperature of the thermostatic oven rises up to the preset temperature.
Therefore, the method cannot be applied actually.

Method used

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

Examples

Experimental program
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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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