JPH0438002A - Digital temperature compensation piezoelectric oscillation circuit - Google Patents

Abstract

PURPOSE:To mass-produce lots of highly stable oscillators by incorporating a phase locked loop circuit to be able to selectably connect so as to generate and write a temperature compensation data automatically with high accuracy efficiently. CONSTITUTION:A temperature data from a digital temperature detection circuit 1 is inputted to a memory circuit 2 as address data and its output data is given to one input terminal of a selection circuit 3. In the case of calculating temperature compensation data, an input terminal of a phase comparator circuit 6 of the selection circuit 3 connects to an ADC 4 by a command of a mode control input. Through the connection above, a phase locked loop is formed and an oscillated frequency of a voltage controlled oscillator (VCO) 5 and a reference frequency are completely made coincident at the establishment of synchronization. The temperature compensation data to be written in the memory circuit and a write address data are easily obtained from an output data of the temperature detection circuit 1 and an output data of the phase comparator circuit 6.

Description

【発明の詳細な説明】 〔産業上の利用分野〕 本発明はディジタル温度補償圧電発振回路に関し、特に
周囲温度に応じてディジタル回路手段で自動的に発振周
波数の温度変化分を補償するディジタル温度補償圧電発
振回路に関する。[Detailed Description of the Invention] [Field of Industrial Application] The present invention relates to a digital temperature-compensated piezoelectric oscillator circuit, and particularly to a digital temperature-compensated piezoelectric oscillator circuit that automatically compensates for temperature changes in the oscillation frequency using digital circuit means according to the ambient temperature. Related to piezoelectric oscillation circuits.

〔従来の技術〕[Conventional technology]

従来のディジタル温度補償圧電発振回路２０は、第３図
に示すように、温度検出回路１の出力データをメモリ回
路２にアドレスデータとして与え、メモリ回路２に予め
書込んでおいた温度補償用の制御データを読出し、これ
をディジタル制御方式の電圧制御圧電発振回路（ＶＣＯ
）１０に与え発振周波数を制御する。温度補償データの
書込み時には、ＶＣＯＩＯの発振周波数を周波数カウン
タ１１で計測し、計測結果をデータ処理部１２に送り、
更にデータ処理部１３へ送って、各温度で所要の発振周
波数が得られるような温度補償データを算定させる。As shown in FIG. 3, the conventional digital temperature-compensated piezoelectric oscillator circuit 20 supplies the output data of the temperature detection circuit 1 to the memory circuit 2 as address data, and uses the temperature compensation data written in the memory circuit 2 in advance. The control data is read out and sent to a digitally controlled voltage controlled piezoelectric oscillator (VCO).
)10 to control the oscillation frequency. When writing temperature compensation data, the oscillation frequency of the VCOIO is measured by the frequency counter 11, the measurement result is sent to the data processing section 12,
Furthermore, the data is sent to the data processing section 13 to calculate temperature compensation data that will allow the required oscillation frequency to be obtained at each temperature.

〔発明が解決しようとする課題〕[Problem to be solved by the invention]

この従来のディジタル温度補償圧電発振回路は、外部の
計測およびデータ処理のみでディジタル的な温度補償デ
ータを作成しているので、高精度を要求される発振回路
など個々の回路ごとに温度補償データを作成する必要が
ある場合には、データ処理量やデータ作成工数が膨大に
なり量産に適してないという問題点を有している。This conventional digital temperature-compensated piezoelectric oscillator circuit creates digital temperature-compensated data using only external measurements and data processing, so temperature-compensated data is generated for each individual circuit, such as an oscillation circuit that requires high accuracy. If it is necessary to create the data, the amount of data processing and the number of man-hours required to create the data become enormous, making it unsuitable for mass production.

〔課題を解決するための手段〕[Means to solve the problem]

本発明の発振回路は、周囲温度を検出し温度データを発
生する温度検出回路と、前記温度データでアドレス指定
される箇所に温度補償用データを格納するためのメモリ
回路と、入力端に与えられる制御データに応答して出力
周波数を制御可能な電圧制御圧電発振器と、該電圧制御
圧電発振器の出力信号および外部から与えられる基準周
波数信号の位相差を検出し位相差データを発生する位相
比較回路と、前記温度補償用データおよび前記位相差デ
ータの一方を選択し前記制御データとして前記電圧制御
圧電発振器の入力端に接続する選択回路とを備えている
。The oscillation circuit of the present invention includes a temperature detection circuit that detects ambient temperature and generates temperature data, a memory circuit that stores temperature compensation data at a location addressed by the temperature data, and a memory circuit that is provided to an input terminal. A voltage-controlled piezoelectric oscillator whose output frequency can be controlled in response to control data, and a phase comparison circuit that detects a phase difference between an output signal of the voltage-controlled piezoelectric oscillator and a reference frequency signal applied from the outside and generates phase difference data. and a selection circuit that selects one of the temperature compensation data and the phase difference data and connects it to the input terminal of the voltage-controlled piezoelectric oscillator as the control data.

〔実施例〕〔Example〕

次に本発明について図面を参照して説明する。 Next, the present invention will be explained with reference to the drawings.

第１図は本発明の第１の実施例の回路図を示す。ディジ
タル形式の温度検出回路１から発する温度データをメモ
リ回路２にアドレスデータとして入力する。メモリ回路
２の出力データは、モード制御入力で選択出力する機能
を有する選択回路３の一方の入力端に接続され、選択回
路３の選択データは、ディジタル−アナログ変換回路（
ＡＤＣ）４でアナログ電圧値に変換されて電圧制御圧電
発振回路（ＶＣＯ）に与えられ、発振周波数を制御する
。ＶＣＯ５の出力信号は、位相比較回路で、外部から与
えられる基準周波数信号と位相比較され、その位相差比
力信号を選択回路３のもう一方の入力端に接続しである
。温度補償データ算定時には、モード制御入力の指示に
より、選択回路３の位相比較回路６側の入力端をＡＤＣ
４に接続させる。この接続により位相同期ループが構成
され、同期確立時にはＶＣＯ５の発振周波数と基準周波
数とが完全に一致し、この時の温度データ（温度検出回
路１の出力データ）と制御電圧データ（位相比較回路６
の出力データ）とから、メモリ回路に書込むべき温度補
償データおよびその書込みアドレスデータを容易に得る
ことができる。FIG. 1 shows a circuit diagram of a first embodiment of the invention. Temperature data generated from a digital temperature detection circuit 1 is input to a memory circuit 2 as address data. The output data of the memory circuit 2 is connected to one input terminal of a selection circuit 3 which has a function of selecting and outputting data using a mode control input, and the selection data of the selection circuit 3 is connected to a digital-to-analog conversion circuit (
ADC) 4 converts the voltage into an analog voltage value, which is applied to a voltage-controlled piezoelectric oscillation circuit (VCO) to control the oscillation frequency. The output signal of the VCO 5 is phase-compared with an externally applied reference frequency signal in a phase comparison circuit, and the phase difference ratio signal is connected to the other input terminal of the selection circuit 3. When calculating temperature compensation data, the input terminal of the selection circuit 3 on the phase comparison circuit 6 side is connected to the ADC according to the mode control input instruction.
Connect to 4. This connection constitutes a phase-locked loop, and when synchronization is established, the oscillation frequency of the VCO 5 and the reference frequency completely match, and the temperature data (output data of the temperature detection circuit 1) and control voltage data (output data of the phase comparison circuit 6) at this time completely match.
Temperature compensation data to be written into the memory circuit and its write address data can be easily obtained from the output data of the memory circuit.

第２図は本発明の第２の実施例を示す回路図である。本
実施例は、第１の実施例（第１図参照）に判別回路７、
制御回路８を付加接続した構成をもつ。本実施例の動作
モード時には、第１の実施例の場合と同様、モード制御
入力で選択回路３の選択接続をメモリ回路２側に設定し
、メモリ回路２から読出される温度補償データをディジ
タル制御形のＶＣＯＩＯに与え発振周波数を制御する。FIG. 2 is a circuit diagram showing a second embodiment of the present invention. In this embodiment, a discrimination circuit 7 is added to the first embodiment (see FIG. 1).
It has a configuration in which a control circuit 8 is additionally connected. In the operation mode of this embodiment, as in the case of the first embodiment, the selection connection of the selection circuit 3 is set to the memory circuit 2 side using the mode control input, and the temperature compensation data read from the memory circuit 2 is digitally controlled. control the oscillation frequency.

また書込みモード時には、モード制御入力で選択回路３
の接続を位相比較回路６側に設定して位相同期ループを
形成し、第１の実施例の場合と同様に、位相比較回路６
から温度補償データを得る。更に本実施例では、判別回
路７にて、温度データで指示されるメモリ回路２のアド
レスに温度補償データを書込み済みが否かを判別し、未
書込みの場合には書込み用の制御回路８が、位相比較回
路６から得た温度補償データをメモリ回路２に書込む。Also, in the write mode, the mode control input selects the selection circuit 3.
is connected to the phase comparison circuit 6 side to form a phase-locked loop, and as in the case of the first embodiment, the phase comparison circuit 6
Obtain temperature compensation data from Furthermore, in this embodiment, the determination circuit 7 determines whether or not temperature compensation data has been written to the address of the memory circuit 2 specified by the temperature data, and if the temperature compensation data has not been written, the writing control circuit 8 , writes the temperature compensation data obtained from the phase comparator circuit 6 into the memory circuit 2.

従って、書込みモードに設定して周囲温度を使用温度範
囲の最小から最大（あるいはその逆〉に１回スィーブす
ることにより、自動的に温度補償データを作成し、メモ
リ回路２に書き込んでいくことができる。Therefore, by setting the write mode and sweeping the ambient temperature once from the minimum to the maximum operating temperature range (or vice versa), temperature compensation data can be automatically created and written to the memory circuit 2. can.

〔発明の効果〕〔Effect of the invention〕

以上説明したよう本発明によれば、位相同期回路を選択
接続可能に組込むことにより、温度補償データを自動的
に高精度で且つ効率良く作成して書込むことができ、高
安定な発振器を量産化できる。As explained above, according to the present invention, temperature compensation data can be automatically created and written with high accuracy and efficiency by incorporating a phase-locked circuit in a selectively connectable manner, and a highly stable oscillator can be mass-produced. can be converted into

【図面の簡単な説明】 第１図および第２図は本発明の実施例のブロック図、第
３図は従来のディジタル温度補償圧電発振回路のブロッ
ク図を示す。 １・・・温度検出回路、２・・・メモリ回路、３・・・
選択回路、４・・・アナログ−ディジタル変換回路（Ａ
ＤＣ）、５．１０・・・電圧制御圧電発振回路（■ＣＯ
）、６・・・位相比較回路、７・・・判別回路、８・・
・制御回路。BRIEF DESCRIPTION OF THE DRAWINGS FIGS. 1 and 2 are block diagrams of an embodiment of the present invention, and FIG. 3 is a block diagram of a conventional digital temperature-compensated piezoelectric oscillation circuit. 1...Temperature detection circuit, 2...Memory circuit, 3...
Selection circuit, 4...Analog-digital conversion circuit (A
DC), 5.10...Voltage controlled piezoelectric oscillation circuit (■CO
), 6... Phase comparison circuit, 7... Discrimination circuit, 8...
・Control circuit.

Claims (1)

【特許請求の範囲】 １、周囲温度を検出し温度データを発生する温度検出回
路と、前記温度データでアドレス指定される箇所に温度
補償用データを格納するためのメモリ回路と、入力端に
与えられる制御データに応答して出力周波数を制御可能
な電圧制御圧電発振器と、該電圧制御圧電発振器の出力
信号および外部から与えられる基準周波数信号の位相差
を検出し位相差データを発生する位相比較回路と、前記
温度補償用データおよび前記位相差データの一方を選択
し前記制御データとして前記電圧制御圧電発振器の入力
端に接続する選択回路とを備えていることを特徴とする
ディジタル温度補償圧電発振回路。 ２、前記選択回路で前記位相差データを前記電圧制御圧
電発振器の入力端に接続している時に、前記位相差デー
タに対応する前記温度補償用データを前記メモリ回路に
書込んでいく書込み用の制御手段を有する請求項１記載
のディジタル温度補償圧電発振回路。[Claims] 1. A temperature detection circuit that detects ambient temperature and generates temperature data, a memory circuit that stores temperature compensation data at a location addressed by the temperature data, and a a voltage-controlled piezoelectric oscillator whose output frequency can be controlled in response to control data provided by the voltage-controlled piezoelectric oscillator; and a phase comparison circuit that detects a phase difference between an output signal of the voltage-controlled piezoelectric oscillator and a reference frequency signal applied from the outside and generates phase difference data. and a selection circuit that selects one of the temperature compensation data and the phase difference data and connects it to the input terminal of the voltage controlled piezoelectric oscillator as the control data. . 2. Writing the temperature compensation data corresponding to the phase difference data into the memory circuit when the selection circuit connects the phase difference data to the input terminal of the voltage controlled piezoelectric oscillator. 2. The digital temperature compensated piezoelectric oscillator circuit according to claim 1, further comprising control means.