JPH0888514A - Temperature compensated oscillator - Google Patents
Temperature compensated oscillatorInfo
- Publication number
- JPH0888514A JPH0888514A JP22505194A JP22505194A JPH0888514A JP H0888514 A JPH0888514 A JP H0888514A JP 22505194 A JP22505194 A JP 22505194A JP 22505194 A JP22505194 A JP 22505194A JP H0888514 A JPH0888514 A JP H0888514A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- change
- compensated oscillator
- oscillation frequency
- bath
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
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- Oscillators With Electromechanical Resonators (AREA)
Abstract
(57)【要約】 （修正有）
【目的】小型でコストの低減が図られると共に制御が容
易な温度補償型発振器を提供する。
【構成】温度変化に対する発振周波数の変化に極大点を
有する発振回路２が内蔵された恒温槽１の温度を、ペル
チェ素子３，ワイヤ４，制御ＩＣ５で極大点に制御す
る。
(57) [Summary] (Modified) [Objective] To provide a temperature-compensated oscillator that is small in size, low in cost, and easy to control. [Structure] The temperature of a thermostatic chamber 1 in which an oscillation circuit 2 having a maximum point in the change of oscillation frequency with respect to a temperature change is built in is controlled to a maximum point by a Peltier element 3, a wire 4, and a control IC 5.
Description
【０００１】[0001]
【産業上の利用分野】本発明は、例えば通信機器やコン
ピュータ等に使用される温度補償型発振器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a temperature-compensated oscillator used in, for example, communication equipment and computers.
【０００２】[0002]
【従来の技術】従来より、発振周波数を一定に保つため
に恒温槽を備えた温度補償型発振器が提案されている。
この温度補償型発振器は、その恒温槽の温度を制御する
ことにより、発振周波数が一定に保たれる構成になって
いる。図５は、従来の温度補償型発振器の一例の、温度
変化に対する発振周波数の変化を示したグラフである。2. Description of the Related Art Conventionally, there has been proposed a temperature-compensated oscillator having a thermostatic chamber for keeping the oscillation frequency constant.
This temperature-compensated oscillator has a configuration in which the oscillation frequency is kept constant by controlling the temperature of the constant temperature bath. FIG. 5 is a graph showing a change in oscillation frequency with respect to a temperature change in an example of a conventional temperature compensation oscillator.
【０００３】この温度補償型発振器の発振周波数は、恒
温槽を冷却する冷却装置を不要とするために、通信機器
やコンピュータ等の仕様で定められた、例えば０℃〜７
０℃の温度範囲を越える８０℃を中心とする温度で制御
される。図５に示すグラフでは、温度変化に対する発振
周波数の変化は直線の傾きで示されている。ここで、例
えば発振周波数の変化率を±２５ｐｐｍの範囲内に収め
るためには、恒温槽の温度は８０℃±１℃の範囲内に制
御される。さらに発振周波数の変化率を±２５ｐｐｍの
範囲内より狭い範囲内に収めるためには、恒温槽の温度
も８０℃±１℃より狭い範囲内に制御すればよいことに
なる。恒温槽の温度をより狭い範囲内で制御すると温度
補償型発振器の発振周波数の精度が向上するため、恒温
槽の温度を高精度に制御することが温度補償型発振器の
発振周波数の精度を高める大きな要素となっている。The oscillation frequency of this temperature-compensated oscillator is determined by the specifications of communication equipment, computers, etc., for example, 0 ° C. to 7 in order to eliminate the need for a cooling device for cooling the constant temperature bath.
It is controlled at a temperature centered at 80 ° C, which exceeds the temperature range of 0 ° C. In the graph shown in FIG. 5, the change in the oscillation frequency with respect to the change in temperature is shown by the slope of a straight line. Here, for example, in order to keep the rate of change of the oscillation frequency within the range of ± 25 ppm, the temperature of the constant temperature bath is controlled within the range of 80 ° C ± 1 ° C. Further, in order to keep the rate of change of the oscillation frequency within a range narrower than ± 25 ppm, the temperature of the constant temperature bath should be controlled within a range narrower than 80 ° C. ± 1 ° C. Since controlling the temperature of the temperature-controlled bath within a narrower range improves the accuracy of the oscillation frequency of the temperature-compensated oscillator, controlling the temperature of the temperature-controlled bath with higher accuracy increases the accuracy of the oscillation frequency of the temperature-compensated oscillator. It is an element.
【０００４】[0004]
【発明が解決しようとする課題】上述したように発振周
波数の精度を高めるためには、恒温槽の温度を高精度に
制御する必要がある。しかし、恒温槽の温度を高精度に
制御するには、周囲の温度変化に対する恒温槽の温度変
化をなるべく小さく抑えるために、恒温槽の形状を大き
くする必要があり、このため温度補償型発振器全体が大
型化し問題がある。As described above, in order to increase the precision of the oscillation frequency, it is necessary to control the temperature of the constant temperature oven with high precision. However, in order to control the temperature of the constant temperature chamber with high accuracy, it is necessary to make the shape of the constant temperature chamber large in order to suppress the temperature change of the constant temperature chamber with respect to the ambient temperature change as much as possible. However, there is a problem that it becomes large.
【０００５】また、恒温槽のわずかな温度変化を検出す
るために、検出精度の高い温度センサを必要とし、さら
にこの温度センサを使用した複雑な制御回路も必要とな
り、部品が増加し、またこれら部品が実装される基板の
面積も多く必要とし、大型化し問題がある。さらに、検
出精度の高い温度センサや制御回路の部品の費用及びこ
れらを実装するための費用が発生し、コストアップの要
因となり問題がある。Further, in order to detect a slight temperature change in the constant temperature bath, a temperature sensor with high detection accuracy is required, and a complicated control circuit using this temperature sensor is also required, resulting in an increase in the number of parts and It requires a large area of the board on which the components are mounted, which causes a problem of increasing the size. Furthermore, there is a problem that the cost of the temperature sensor and the control circuit having high detection accuracy and the cost for mounting these components are generated, which causes a cost increase.
【０００６】本発明は、上記事情に鑑み、小型でコスト
の低減が図られると共に制御が容易な温度補償型発振器
を提供することを目的とする。In view of the above circumstances, it is an object of the present invention to provide a temperature-compensated oscillator which is small in size, low in cost, and easy to control.
【０００７】[0007]
【課題を解決するための手段】上記目的を達成する本発
明の温度補償型発振器は、恒温槽を備えた温度補償型発
振器において、その温度補償型発振器が、温度変化に対
する発振周波数の変化に極大点あるいは極小点を有する
ものであると共に、上記恒温槽の温度を上記極大点ある
いは極小点に制御する制御回路を備えたことを特徴とす
るものである。The temperature-compensated oscillator of the present invention which achieves the above object is a temperature-compensated oscillator having a thermostatic chamber, wherein the temperature-compensated oscillator has a maximum in the change of the oscillation frequency due to the temperature change. It has a point or a minimum point, and is characterized by including a control circuit for controlling the temperature of the constant temperature bath to the maximum point or the minimum point.
【０００８】[0008]
【作用】本発明の温度補償型発振器は、恒温槽の設定温
度は極大点あるいは極小点の位置に設定されているた
め、発振周波数の変化を所定の範囲内に収めるには、そ
の設定温度を基準として、その設定温度より低い温度範
囲及びその設定温度より高い温度範囲の双方の温度範囲
内で制御すればよく、恒温槽の温度制御が容易になる。In the temperature-compensated oscillator of the present invention, the set temperature of the thermostatic chamber is set at the maximum point or the minimum point. Therefore, in order to keep the change of the oscillation frequency within the predetermined range, As a reference, the temperature may be controlled within both the temperature range lower than the set temperature and the temperature range higher than the set temperature, which facilitates temperature control of the constant temperature bath.
【０００９】ここで従来技術との比較について図１を参
照しながら説明する。図１は、本発明の温度補償型発振
器及び従来の温度補償型発振器双方についての温度変化
に対する発振周波数の変化を示したグラフである。図１
に示す曲線Ａは、本発明温度補償型発振器の一例として
の、極大点Ｐを有する温度補償型発振器の温度変化に対
する発振周波数の変化を示すものであり、一方、点線Ｂ
は従来の温度補償型発振器の温度変化に対する発振周波
数の変化を示すものである。従来の温度補償型発振器で
は、点線Ｂのように直線の傾きで、温度変化に対し発振
周波数が変化する。このため恒温槽の温度制御の限界を
示す温度精度ｄＴ1 （温度のふらつき）に対して発振周
波数はｄｆ1 だけふらつくこととなり、従って、この温
度補償型発振器はｄｆ1 の精度を有することとなる。A comparison with the prior art will now be described with reference to FIG. FIG. 1 is a graph showing changes in oscillation frequency with respect to temperature changes in both the temperature-compensated oscillator of the present invention and the conventional temperature-compensated oscillator. FIG.
The curve A shown in Fig. 2 shows the change of the oscillation frequency with respect to the temperature change of the temperature-compensated oscillator having the maximum point P as an example of the temperature-compensated oscillator of the present invention, while the dotted line B
Shows the change of the oscillation frequency with respect to the temperature change of the conventional temperature compensation oscillator. In the conventional temperature-compensated oscillator, the oscillation frequency changes with a temperature change due to the inclination of a straight line as shown by the dotted line B. For this reason, the oscillation frequency fluctuates by df 1 with respect to the temperature accuracy dT 1 (temperature fluctuation) indicating the limit of temperature control of the constant temperature bath, and therefore, this temperature-compensated oscillator has the accuracy of df 1. .
【００１０】一方、本発明の温度補償型発振器では、曲
線Ａのように２次曲線の傾きで、温度変化に対し発振周
波数が変化し、設定温度Ｔは曲線Ａの極大点Ｐに設定さ
れている。ここで、ｄｆ1 の精度と同じｄｆ2 の精度を
得るには、恒温槽の温度精度は、極大点Ｐに設定された
設定温度より低い温度範囲及びその設定温度より高い温
度範囲の双方の温度範囲でよく、この温度範囲が恒温槽
の温度精度ｄＴ2 となり、温度精度ｄＴ1 より広がる。On the other hand, in the temperature-compensated oscillator of the present invention, the oscillating frequency changes with the temperature change due to the slope of the quadratic curve like the curve A, and the set temperature T is set at the maximum point P of the curve A. There is. Here, in order to obtain the accuracy of df 2 which is the same as the accuracy of df 1 , the temperature accuracy of the constant temperature bath is set to a temperature in both a temperature range lower than the set temperature set at the maximum point P and a temperature range higher than the set temperature. The range is good, and this temperature range is the temperature accuracy dT 2 of the constant temperature bath, which is wider than the temperature accuracy dT 1 .
【００１１】したがって、同等の発振周波数の精度を得
るのに、恒温槽の温度精度は従来と比べ低い精度でよ
く、検出精度の低い温度センサや簡単な制御回路で済
み、小型化されコストの低減が図られる。また恒温槽の
温度精度が粗くても十分な高精度の発振周波数に制御さ
れるため、恒温槽の形状も小さくて済む。Therefore, in order to obtain the same accuracy of the oscillation frequency, the temperature accuracy of the constant temperature bath may be lower than that of the conventional one, and a temperature sensor having a low detection accuracy and a simple control circuit may be used, and the size and cost can be reduced. Is planned. Further, even if the temperature of the constant temperature chamber is rough, the oscillation frequency is controlled to a sufficiently high precision, so the shape of the constant temperature chamber can be small.
【００１２】[0012]
【実施例】以下、本発明の実施例について説明する。図
２は、本発明の温度補償型発振器の一実施例を示す図で
ある。図２に示す温度補償型発振器は、恒温槽１と、そ
の恒温槽１の中に組み込まれた発振回路２と、恒温槽１
の上部に載置されたペルチェ素子３と、ペルチェ素子３
と接続されたワイヤ４と、制御ＩＣ５と、回路基板６と
から構成されている。Embodiments of the present invention will be described below. FIG. 2 is a diagram showing an embodiment of the temperature compensation oscillator of the present invention. The temperature-compensated oscillator shown in FIG. 2 includes a constant temperature bath 1, an oscillation circuit 2 incorporated in the constant temperature bath 1, and a constant temperature bath 1.
Peltier element 3 placed on the upper part of the
It is composed of a wire 4 connected to, a control IC 5, and a circuit board 6.
【００１３】恒温槽１は小型で簡素な構造を有してお
り、回路基板６に取り付けられている。発振回路２は、
四ほう酸リチウム（Ｌｉ2 ・Ｂ4 ・Ｏ7 ）を基板とした
弾性表面波共振子を用いて形成されており、恒温槽１の
温度を検出するためのサーミスタ（図示せず）を有して
いる。発振回路２は、このサーミスタで検出された恒温
槽１の温度に応じた周波数で発振する。The constant temperature bath 1 has a small size and a simple structure, and is attached to the circuit board 6. The oscillator circuit 2
It is formed by using a surface acoustic wave resonator using lithium tetraborate (Li 2 , B 4 , O 7 ) as a substrate, and has a thermistor (not shown) for detecting the temperature of the constant temperature bath 1. There is. The oscillation circuit 2 oscillates at a frequency according to the temperature of the constant temperature bath 1 detected by the thermistor.
【００１４】ペルチェ素子３は、２つの異なる金属で接
合されており接合された部分の温度が、ペルチェ素子３
と接続されたワイヤ４に流れる電流の向きに応じて上昇
又は下降することを利用して恒温槽１を加熱又は冷却す
る。制御ＩＣ５は、発振回路２のサーミスタで検出され
た恒温槽１の温度に応じてペルチェ素子３に流れる電流
の向きと大きさを制御する。The Peltier element 3 is joined by two different metals, and the temperature of the joined portion is determined by the Peltier element 3
The constant temperature bath 1 is heated or cooled by utilizing the rise or fall according to the direction of the current flowing through the wire 4 connected to the constant temperature bath 1. The control IC 5 controls the direction and magnitude of the current flowing through the Peltier element 3 according to the temperature of the constant temperature bath 1 detected by the thermistor of the oscillation circuit 2.
【００１５】図３は、図２に示す発振回路２の温度変化
に対する発振周波数の変化を示したグラフである。図３
に示すように、発振回路２は常温付近の変化に対する発
振周波数の変化に極大点を有している。図４は、図３に
示すグラフの極大点付近を拡大して示したグラフであ
る。FIG. 3 is a graph showing changes in the oscillation frequency with respect to changes in the temperature of the oscillator circuit 2 shown in FIG. FIG.
As shown in, the oscillation circuit 2 has a maximum point in the change of the oscillation frequency with respect to the change in the vicinity of room temperature. FIG. 4 is an enlarged graph showing the vicinity of the maximum point of the graph shown in FIG.
【００１６】図４に示すように発振周波数の変化率を±
２５ｐｐｍの範囲内に収めるためには、恒温槽１の温度
を３３．５℃±１２．５℃の範囲内に制御すればよく、
図５に示す従来の温度補償型発振器の発振周波数の変化
率±２５ｐｐｍの範囲内と同じ範囲内に収める場合の温
度範囲８０±１℃と比較し、±１１．５℃の分だけ温度
範囲が広がっており、恒温槽の温度制御が容易となる。
このため本実施例では、ペルチェ素子３，ワイヤ４，制
御ＩＣ５からなる簡易型の加熱冷却装置で恒温槽１の温
度を制御すればよく、小型でコストが低減された温度補
償型発振器を得ることができた。As shown in FIG. 4, the rate of change of the oscillation frequency is ±
In order to keep the temperature within the range of 25 ppm, the temperature of the constant temperature bath 1 may be controlled within the range of 33.5 ° C. ± 12.5 ° C.,
Compared with the temperature range of 80 ± 1 ° C. when the rate of change of the oscillation frequency of the conventional temperature-compensated oscillator shown in FIG. 5 is within the same range of ± 25 ppm, the temperature range is ± 11.5 ° C. It has spread, and it becomes easy to control the temperature of the constant temperature bath.
Therefore, in this embodiment, the temperature of the thermostatic chamber 1 may be controlled by a simple heating / cooling device composed of the Peltier device 3, the wire 4, and the control IC 5, and a small temperature-compensated temperature-compensated oscillator can be obtained. I was able to.
【００１７】[0017]
【発明の効果】以上説明したように、本発明の温度補償
型発振器は温度変化に対する発振周波数の変化に極大点
あるいは極小点を有するものであり、その極大点あるい
は極小点に恒温槽の温度を制御するものであるため、恒
温槽の温度制御が容易になり、また恒温槽の形状が小さ
くて済み、さらに制御回路も簡素化され、小型化が図ら
れ、かつコストが低減される。As described above, the temperature-compensated oscillator of the present invention has a maximum point or a minimum point in the change of the oscillation frequency with respect to the temperature change, and the temperature of the constant temperature bath is set at the maximum point or the minimum point. Since the temperature is controlled, the temperature control of the constant temperature bath becomes easy, the shape of the constant temperature bath is small, the control circuit is simplified, the size is reduced, and the cost is reduced.
【図１】本発明の温度補償型発振器及び従来の温度補償
型発振器双方についての温度変化に対する発振周波数の
変化を示したグラフである。FIG. 1 is a graph showing changes in oscillation frequency with respect to temperature changes in both the temperature-compensated oscillator of the present invention and the conventional temperature-compensated oscillator.
【図２】本発明の温度補償型発振器の一実施例を示す図
である。FIG. 2 is a diagram showing an embodiment of a temperature compensation oscillator of the present invention.
【図３】図２に示す発振回路の温度変化に対する発振周
波数の変化を示したグラフである。3 is a graph showing a change in oscillation frequency with respect to a change in temperature of the oscillation circuit shown in FIG.
【図４】図３に示すグラフの極大点付近を拡大して示し
たグラフである。FIG. 4 is an enlarged graph showing the vicinity of a maximum point of the graph shown in FIG.
【図５】従来の温度補償型発振器の一例の、温度変化に
対する発振周波数の変化を示したグラフである。FIG. 5 is a graph showing changes in oscillation frequency with respect to changes in temperature in an example of a conventional temperature compensation oscillator.
１ 恒温槽 ２ 発振回路 ３ ペルチェ素子 ４ ワイヤ ５ 制御ＩＣ ６ 回路基板 1 Constant Temperature Bath 2 Oscillation Circuit 3 Peltier Element 4 Wire 5 Control IC 6 Circuit Board
Claims (1)
て、 該温度補償型発振器が、温度変化に対する発振周波数の
変化に極大点あるいは極小点を有するものであると共
に、 前記恒温槽の温度を前記極大点あるいは極小点に制御す
る制御回路を備えたことを特徴とする温度補償型発振
器。1. A temperature-compensated oscillator having a thermostatic chamber, wherein the temperature-compensated oscillator has a maximum point or a minimum point in the change of the oscillation frequency with respect to temperature change, and the temperature of the constant-temperature chamber is set to the above-mentioned range. A temperature-compensated oscillator comprising a control circuit for controlling a maximum point or a minimum point.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22505194A JPH0888514A (en) | 1994-09-20 | 1994-09-20 | Temperature compensated oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP22505194A JPH0888514A (en) | 1994-09-20 | 1994-09-20 | Temperature compensated oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0888514A true JPH0888514A (en) | 1996-04-02 |
Family
ID=16823274
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP22505194A Withdrawn JPH0888514A (en) | 1994-09-20 | 1994-09-20 | Temperature compensated oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0888514A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007300394A (en) * | 2006-04-28 | 2007-11-15 | Kyocera Kinseki Corp | Piezoelectric oscillator |
| JP2011217224A (en) * | 2010-04-01 | 2011-10-27 | Seiko Epson Corp | Constant-temperature piezoelectric oscillator |
| CN102575779A (en) * | 2009-09-03 | 2012-07-11 | 株式会社爱发科 | Gate valve |
-
1994
- 1994-09-20 JP JP22505194A patent/JPH0888514A/en not_active Withdrawn
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2007300394A (en) * | 2006-04-28 | 2007-11-15 | Kyocera Kinseki Corp | Piezoelectric oscillator |
| CN102575779A (en) * | 2009-09-03 | 2012-07-11 | 株式会社爱发科 | Gate valve |
| JP2011217224A (en) * | 2010-04-01 | 2011-10-27 | Seiko Epson Corp | Constant-temperature piezoelectric oscillator |
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| Date | Code | Title | Description |
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| A300 | Withdrawal of application because of no request for examination |
Free format text: JAPANESE INTERMEDIATE CODE: A300 Effective date: 20011120 |