JPH07273546A - Digital temperature compensated piezoelectric oscillator - Google Patents
Digital temperature compensated piezoelectric oscillatorInfo
- Publication number
- JPH07273546A JPH07273546A JP6085898A JP8589894A JPH07273546A JP H07273546 A JPH07273546 A JP H07273546A JP 6085898 A JP6085898 A JP 6085898A JP 8589894 A JP8589894 A JP 8589894A JP H07273546 A JPH07273546 A JP H07273546A
- Authority
- JP
- Japan
- Prior art keywords
- temperature
- rom
- piezoelectric oscillator
- temperature compensation
- digital
- 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.)
- Pending
Links
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は、主に無線機器や測定器
等に適したディジタル温度補償圧電発振器に関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a digital temperature-compensated piezoelectric oscillator mainly suitable for radio equipment, measuring instruments and the like.
【０００２】[0002]
【従来の技術】従来より温度補償圧電発振器として、と
りわけ水晶振動子を利用した発振器ではＴＣＸＯやディ
ジタルＴＣＸＯと呼ばれる発振器が広く利用されてい
る。しかしディジタル温度補償圧電発振器では、温度補
償が階段状に変化するため、無線通信に利用される際
に、送信期間に温度変化により温度補償が働き、周波数
が階段状に変化するという現象が生じていた。2. Description of the Related Art Conventionally, as temperature-compensated piezoelectric oscillators, oscillators called TCXO and digital TCXO have been widely used, especially in oscillators using a crystal oscillator. However, in a digital temperature-compensated piezoelectric oscillator, temperature compensation changes stepwise, so when used in wireless communication, temperature compensation works due to temperature changes during the transmission period, causing a phenomenon in which the frequency changes stepwise. It was
【０００３】[0003]
【発明が解決しようとする課題】このように温度補償が
行われ周波数が階段状に変化すると、特にディジタル通
信においては、送信期間中に位相が変わるので、送信デ
ータが変化してデータエラーを生じるおそれがある。そ
こで送信期間中に温度補償を滑らかにするため、温度補
償データがディジタルからアナログに変換した信号を時
定数の大きな回路（ローパスフィルタ等）に入れる方法
がとられているが、まだ不十分である。そこで本発明で
は、一定期間温度補償を停止し、その期間温度補償が更
新されない機能を有したディジタル温度補償圧電発振器
を提供している。When temperature compensation is performed and the frequency changes stepwise in this way, especially in digital communication, the phase changes during the transmission period, so the transmission data changes and a data error occurs. There is a risk. Therefore, in order to smooth the temperature compensation during the transmission period, a method in which the signal obtained by converting the temperature compensation data from digital to analog is put into a circuit with a large time constant (low-pass filter etc.) is taken, but it is still insufficient. . Therefore, the present invention provides a digital temperature-compensated piezoelectric oscillator having a function of stopping temperature compensation for a certain period and not updating the temperature compensation during that period.
【０００４】[0004]
【実施例】図１は、本発明の構成を示すブロック図であ
る。温度センサー１により温度情報を感知し、温度情報
信号はＡ／Ｄ変換器２によりディジタル信号に変換され
る。ディジタル化された温度情報は、ＲＯＭ３に入力さ
れる。ＲＯＭ３には温度情報に対応した温度補償データ
が蓄積されている。ＲＯＭ３は、書き換え可能なＥＥＰ
ＲＯＭが多く使用されるが、他のＲＯＭであってもよ
い。従来はＲＯＭ３の出力をＤ／Ａ変換器６によりディ
ジタル信号からアナログ信号に変換し、ローパスフィル
タ７を経て電圧制御圧電発振器（ＶＣＸＯ）８に接続さ
れている。Ｄ／Ａ変換器６と電圧制御圧電発振器８との
間のローパスフィルタ７は、時定数の大きなローパスフ
ィルタでラッチごとに変わるアナログ信号の変化を緩や
かにするためにある。本発明では、ＲＯＭ３の出力をラ
ッチ回路５に接続し、外部からの制御信号により最後に
変化した温度補償ディジタルデータでロックし、電圧制
御圧電発振器にかかるアナログ電圧が制御信号期間中変
化しないようにしている。その結果外部からの制御信号
のある期間中は、その期間中温度変化により新たな温度
補償データが入力されてもディジタル温度補償圧電発振
器の出力周波数は変化しない。なお本実施例ではローパ
スフィルタ７の入出力を短絡するスイッチ９が外部制御
信号によって切り換えているが、これは外部制御信号に
よりディジタル信号がラッチされ、その時の補償データ
がＤ／Ａ変換器６でアナログ変換されるが、ローパスフ
ィルタ７によって時定数をもち、制御信号期間中であっ
ても補償電圧が変化してしまう。そこでローパスフィル
タ７を短絡して、ラッチされたら直ちに所定の温度補償
電圧となり、電圧制御発振器８に入力され、制御信号期
間中の周波数変化を防止している。なお制御回路５は、
外部からの制御信号によりラッチ回路４とローパスフィ
ルタ７のスイッチ９を制御する回路である。FIG. 1 is a block diagram showing the structure of the present invention. Temperature information is detected by the temperature sensor 1, and the temperature information signal is converted into a digital signal by the A / D converter 2. The digitized temperature information is input to the ROM 3. The ROM 3 stores temperature compensation data corresponding to the temperature information. ROM3 is a rewritable EEP
Although a ROM is often used, another ROM may be used. Conventionally, the output of the ROM 3 is converted from a digital signal to an analog signal by a D / A converter 6, and is connected to a voltage controlled piezoelectric oscillator (VCXO) 8 via a low pass filter 7. The low-pass filter 7 between the D / A converter 6 and the voltage-controlled piezoelectric oscillator 8 is a low-pass filter having a large time constant so as to moderate the change of the analog signal which changes for each latch. In the present invention, the output of the ROM 3 is connected to the latch circuit 5 and locked by the temperature compensation digital data which is changed last by the control signal from the outside so that the analog voltage applied to the voltage controlled piezoelectric oscillator does not change during the control signal period. ing. As a result, during a certain period of the external control signal, the output frequency of the digital temperature-compensated piezoelectric oscillator does not change even if new temperature compensation data is input due to the temperature change during that period. In this embodiment, the switch 9 that short-circuits the input and output of the low-pass filter 7 is switched by the external control signal. However, the digital signal is latched by the external control signal, and the compensation data at that time is stored in the D / A converter 6. Although analog conversion is performed, the low-pass filter 7 has a time constant, and the compensation voltage changes even during the control signal period. Therefore, the low-pass filter 7 is short-circuited, and when it is latched, it becomes a predetermined temperature compensation voltage and is input to the voltage controlled oscillator 8 to prevent a frequency change during the control signal period. The control circuit 5 is
It is a circuit that controls the latch circuit 4 and the switch 9 of the low-pass filter 7 by a control signal from the outside.
【０００５】また図２は、本発明の温度補償のタイミン
グを表すタイミングチャートである。ＲＯＭ出力データ
は、一定期間ごとに温度センサーからの温度データに対
応する温度補償データが更新される。外部より制御信号
が入力されると、最後の温度補償データが制御信号が停
止するまで継続される。すなわちその期間内は温度補償
データは更新されない。外部からの制御信号が停止する
と、最新の温度補償データに更新される。また外部制御
信号が入力されると、ローパスフィルタはスイッチ９に
よってスルー状態となり、アナログ信号はローパスフィ
ルタを通過しなくなる。これにより緩やかに変化してい
た周波数が、制御信号入力期間だけ直ちに所定の温度補
償電圧になり、電圧制御圧電発振器に入力される。FIG. 2 is a timing chart showing the timing of temperature compensation according to the present invention. As the ROM output data, temperature compensation data corresponding to the temperature data from the temperature sensor is updated at regular intervals. When a control signal is input from the outside, the last temperature compensation data is continued until the control signal stops. That is, the temperature compensation data is not updated within that period. When the control signal from the outside is stopped, the latest temperature compensation data is updated. When the external control signal is input, the switch 9 switches the low-pass filter to the through state, and the analog signal does not pass through the low-pass filter. As a result, the frequency that has been gradually changed becomes the predetermined temperature compensation voltage immediately during the control signal input period and is input to the voltage controlled piezoelectric oscillator.
【０００６】本発明では無線機器に使用される際、一定
期間例えば送信期間中は、温度補償を停止し、送信期間
開始時の補償量を保持するようにしている。すなわち送
信期間中は周波数は変わらないようにしている。このよ
うにすると送信期間中は位相変化も起きないのでデータ
エラーを防止することが出来た。例えばＴＤＭＡのよう
なディジタル通信において有効な手段である。またこれ
に限らず通信分野や、精密な測定を行っていて一定期
間、クロックの周波数や位相が変化すると精度が低下す
る場合に有効な手段である。In the present invention, when used in a wireless device, temperature compensation is stopped for a certain period, for example, during the transmission period, and the compensation amount at the start of the transmission period is held. That is, the frequency is kept unchanged during the transmission period. In this way, no phase change occurs during the transmission period, so that a data error can be prevented. For example, it is an effective means in digital communication such as TDMA. Further, it is not limited to this, but it is an effective means in the field of communication, or in the case where precision measurement is performed and accuracy is deteriorated when the frequency or phase of the clock changes for a certain period.
【０００７】[0007]
【発明の効果】本発明は、温度補償圧電発振器における
短期間での周波数変化を解決することが出来た。無線機
器に利用した場合、特にディジタル通信の送信期間中に
変化する周波数や位相の変化が無くなり、外部制御信号
期間温度補償を変化させないようにし、周波数や位相の
変化を制御期間中は無くしたことにより、送信データの
精度が上がりデータエラーが皆無となった。また無線機
器に限らず短期間での周波数や位相の変化により精度が
低下する測定機器等その用途は広い。INDUSTRIAL APPLICABILITY The present invention can solve the frequency change in the temperature-compensated piezoelectric oscillator in a short period. When used for wireless devices, the frequency and phase changes that change during the transmission period of digital communication are eliminated, and the temperature compensation of the external control signal period is not changed, and the frequency and phase changes are eliminated during the control period. As a result, the accuracy of the transmitted data was improved and there were no data errors. Further, not only wireless devices but also measuring devices, whose accuracy is deteriorated due to changes in frequency and phase in a short period of time, have wide applications.
【図面の簡単な説明】[Brief description of drawings]
【図１】図１は、本発明の構成を示すブロック図であ
る。FIG. 1 is a block diagram showing a configuration of the present invention.
【図２】図２は、本発明の温度補償のタイミングを示す
タイミングチャートである。FIG. 2 is a timing chart showing the timing of temperature compensation of the present invention.
１ 温度センサー ２ Ａ／Ｄ変換器 ３ ＲＯＭ ４ ラッチ回路 ６ Ｄ／Ａ変換器 ７ ローパスフィルタ ８ 電圧制御圧電発振器 1 Temperature Sensor 2 A / D Converter 3 ROM 4 Latch Circuit 6 D / A Converter 7 Low Pass Filter 8 Voltage Control Piezoelectric Oscillator
Claims (3)
度情報によって出力し、Ｄ／Ａ変換器により該温度補償
データをアナログ信号に変換し、電圧制御圧電発振器を
制御して温度補償を行うディジタル温度補償圧電発振器
において、該温度補償データを所定の期間、外部制御信
号によって該ＲＯＭからの温度補償データをラッチする
ラッチ回路を設けたことを特徴とするディジタル温度補
償圧電発振器。1. A digital device for outputting temperature compensation data stored in a ROM according to temperature information, converting the temperature compensation data into an analog signal by a D / A converter, and controlling a voltage controlled piezoelectric oscillator to perform temperature compensation. A temperature-compensated piezoelectric oscillator, comprising a latch circuit for latching the temperature-compensated data from the ROM according to an external control signal for a predetermined period of time.
度情報によって出力し、Ｄ／Ａ変換器により該温度補償
データをアナログ信号に変換し、電圧制御圧電発振器を
制御して温度補償を行い、無線機器に使用されるディジ
タル温度補償圧電発振器において、該無線機器の送信期
間中、該ＲＯＭからの温度補償データをラッチするラッ
チ回路を設けたことを特徴とするディジタル温度補償圧
電発振器。2. A temperature compensation data stored in a ROM is output according to temperature information, the D / A converter converts the temperature compensation data into an analog signal, and a voltage controlled piezoelectric oscillator is controlled to perform temperature compensation, A digital temperature compensated piezoelectric oscillator used in a wireless device, comprising a latch circuit for latching temperature compensation data from the ROM during a transmission period of the wireless device.
との間のローパスフィルタを外部制御信号によって短絡
したことを特徴とする特許請求の範囲第１項記載のディ
ジタル温度補償圧電発振器。3. The digital temperature-compensated piezoelectric oscillator according to claim 1, wherein a low-pass filter between the D / A converter and the voltage-controlled piezoelectric oscillator is short-circuited by an external control signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6085898A JPH07273546A (en) | 1994-03-31 | 1994-03-31 | Digital temperature compensated piezoelectric oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP6085898A JPH07273546A (en) | 1994-03-31 | 1994-03-31 | Digital temperature compensated piezoelectric oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH07273546A true JPH07273546A (en) | 1995-10-20 |
Family
ID=13871696
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP6085898A Pending JPH07273546A (en) | 1994-03-31 | 1994-03-31 | Digital temperature compensated piezoelectric oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH07273546A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8779974B2 (en) | 2010-05-07 | 2014-07-15 | Seiko Epson Corporation | Piezoelectric oscillator, GPS receiver device, and electronic apparatus |
-
1994
- 1994-03-31 JP JP6085898A patent/JPH07273546A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US8779974B2 (en) | 2010-05-07 | 2014-07-15 | Seiko Epson Corporation | Piezoelectric oscillator, GPS receiver device, and electronic apparatus |
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