JPH04504035A - Automatic calibration of oscillators in heterodyne radio receivers - Google Patents
Automatic calibration of oscillators in heterodyne radio receiversInfo
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- JPH04504035A JPH04504035A JP1506396A JP50639689A JPH04504035A JP H04504035 A JPH04504035 A JP H04504035A JP 1506396 A JP1506396 A JP 1506396A JP 50639689 A JP50639689 A JP 50639689A JP H04504035 A JPH04504035 A JP H04504035A
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- 238000000034 method Methods 0.000 claims description 42
- 239000013078 crystal Substances 0.000 claims description 15
- 230000015572 biosynthetic process Effects 0.000 claims description 6
- 238000003786 synthesis reaction Methods 0.000 claims description 6
- 239000002131 composite material Substances 0.000 claims description 5
- 238000005070 sampling Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 238000004364 calculation method Methods 0.000 claims 2
- 230000004069 differentiation Effects 0.000 claims 2
- 238000006243 chemical reaction Methods 0.000 claims 1
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- 230000010355 oscillation Effects 0.000 claims 1
- 230000006903 response to temperature Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 5
- 238000012360 testing method Methods 0.000 description 3
- 230000032683 aging Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000002347 injection Methods 0.000 description 2
- 239000007924 injection Substances 0.000 description 2
- 238000012545 processing Methods 0.000 description 2
- 238000004891 communication Methods 0.000 description 1
- 238000012937 correction Methods 0.000 description 1
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- 239000010453 quartz Substances 0.000 description 1
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N silicon dioxide Inorganic materials O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03D—DEMODULATION OR TRANSFERENCE OF MODULATION FROM ONE CARRIER TO ANOTHER
- H03D7/00—Transference of modulation from one carrier to another, e.g. frequency-changing
- H03D7/16—Multiple-frequency-changing
- H03D7/161—Multiple-frequency-changing all the frequency changers being connected in cascade
- H03D7/163—Multiple-frequency-changing all the frequency changers being connected in cascade the local oscillations of at least two of the frequency changers being derived from a single oscillator
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L7/00—Automatic control of frequency or phase; Synchronisation
- H03L7/06—Automatic control of frequency or phase; Synchronisation using a reference signal applied to a frequency- or phase-locked loop
- H03L7/08—Details of the phase-locked loop
- H03L7/10—Details of the phase-locked loop for assuring initial synchronisation or for broadening the capture range
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L1/00—Stabilisation of generator output against variations of physical values, e.g. power supply
- H03L1/02—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only
- H03L1/022—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature
- H03L1/023—Stabilisation of generator output against variations of physical values, e.g. power supply against variations of temperature only by indirect stabilisation, i.e. by generating an electrical correction signal which is a function of the temperature by using voltage variable capacitance diodes
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Oscillators With Electromechanical Resonators (AREA)
Abstract
(57)【要約】本公報は電子出願前の出願データであるため要約のデータは記録されません。 (57) [Summary] This bulletin contains application data before electronic filing, so abstract data is not recorded.
Description
【発明の詳細な説明】 ヘテロダイン無線受信機における発振器の自動較正技術分野 本発明は、発振器の自動較正に関し、さらに詳しくは、周波数精度および安定度 を達成するための、高周波単側波帯（ＨＦ ５ＳＢ）ヘテロダイン無線受信機に おける発振器の温度および周波数の較正に関する。[Detailed description of the invention] Automatic calibration technology of oscillators in heterodyne radio receivers The present invention relates to automatic calibration of oscillators, and more particularly to frequency accuracy and stability. High frequency single sideband (HF 5SB) heterodyne radio receiver to achieve Concerning the calibration of oscillator temperature and frequency in
背景技術 周波数の精度および安定度は、無線通信、特にＨＦ ＳＳＢにおいて重要な問題 である。ラジオ用の発振部分（特に、発振する水晶）の振動周波数は特に、温度 の変化に敏感でおり、そのため、オーブン容器内で一定の温度に保だ−れること によって、通常は周囲温度の状態から隔離されている。Background technology Frequency accuracy and stability are important issues in wireless communications, especially in HF SSB. It is. The vibration frequency of the oscillating part (especially the oscillating crystal) for radios depends on the temperature. It is sensitive to changes in temperature and therefore must be kept at a constant temperature in an oven container. normally isolated from ambient temperature conditions.
発振器の主な周波数寄与部分は水晶からのものである。The main frequency contribution of the oscillator is from the crystal.
水晶について、典型的な温度に対する周波数偏移の特性を図示したのが第１図で ある。このため高い周波数安定度は、水晶の温度を、ある与えられた湿度変化に 対する最低周波数偏移点（すなわち、傾きゼロ）近傍に調節することによって達 成できる。また、水晶自体の基本特性に基づき、発振器全体の動作温度を調節す る方法によっても、高い周波数安定度が得られる。Figure 1 illustrates the typical frequency deviation characteristics with respect to temperature for quartz crystals. be. Therefore, high frequency stability means that the temperature of the crystal changes for a given humidity change. This is achieved by adjusting near the lowest frequency deviation point (i.e., zero slope) for Can be done. Additionally, the operating temperature of the entire oscillator can be adjusted based on the basic characteristics of the crystal itself. A high frequency stability can also be obtained by the method.
最大周波数安定度が得られるこの最適温度は水晶によって相当違いがあり、また 各水晶においても、時間が経過するとエージングのために異なってくる。このた め、オーブン温度は通常、各発振器に対し、それらがラジオに組み込まれる前に 、工場で精密計測器を用いて一定の許容誤差の範囲内で個々に設定され、ついで 、いったん組み立てられた後に個々に周波数調整が行われるが、各発振器は、そ の製品寿命を通じ、また時間の経過につれて、現場で調整を行う必要が必る。This optimum temperature at which maximum frequency stability is obtained varies considerably from crystal to crystal, and Each crystal will also differ over time due to aging. others Therefore, oven temperatures are typically set for each oscillator before they are built into the radio. are individually set within certain tolerances using precision instrumentation at the factory, and then Once assembled, each oscillator is individually frequency adjusted; Over the life of the product and over time, adjustments will need to be made in the field.
ラジオが、水晶発振器からの信号など基準周波数信号に同期された位相同期ルー プから構成される場合、もう１つの周波数偏移源となるのが、位相同期ループ内 の電圧制御発振器（ＶＣＯ）である。ラジオの製品寿命の間、中心周波数は周囲 の動作条件およびエージングのためにずれやすい。回路の中心周波数が臨界周波 数である場合には、はとんどの位相同期ループがポテンシオメータによる手動調 整を必要とする。The radio uses a phase-locked loop synchronized to a reference frequency signal, such as a signal from a crystal oscillator. Another source of frequency deviation is the frequency deviation within the phase-locked loop. It is a voltage controlled oscillator (VCO). During the life of the radio, the center frequency will be prone to slippage due to operating conditions and aging. The center frequency of the circuit is the critical frequency If the number of Needs adjustment.
そこで必要とされるのか、発振器の動作部分を独立して調節する方法（ラジオ自 体に必要不可欠〉である。現代のＮＦ ＳＳＢラジオでは、精密試験計器を用い ず、単にラジオ自体の素子を用いて、現場のラジオ内部で自動的に較正すること が可能である。これは、既知のデジタル信号処理／周波数サンプリング法を用い て、従来のマイクロプロセッサにより簡単に可聴出力で測定できるように、周波 数誤差が無線受信機内で逓倍されるからである。Is there a need for a method to independently adjust the operating parts of the oscillator (radio automatic It is essential for the body. Modern NF SSB radios use precision test instruments. calibrate automatically inside the radio in the field, simply using the radio's own components. is possible. This uses known digital signal processing/frequency sampling methods. The frequency This is because the numerical error is multiplied within the radio receiver.
従って本発明の目的は、外部周波基準信号のみを用いて、望ましい周波数安定度 を得るために、発振器の基本主要特性に基づき、発振器の温度および周波数を自 動的かつ積分法により較正する方法を提供することである。It is therefore an object of the present invention to achieve the desired frequency stability using only an external frequency reference signal. In order to obtain The object of the present invention is to provide a method for dynamic and integral calibration.
発明の概要 本発明により、発振器の温度が設定可能なシステムにおいて周波数安定度を達成 するために、発振器の温度を自動的かつ積分法により較正するシステムが提供さ れる。温度の較正は、発振器の現在の最適動作温度を積分法によって算定し、発 振器の温度を前記最適温度に積分法によりリセットすることによって実行される 。このため、周波数安定度関係の安定度が達成され、ついで周波数の較正が可能 となる。Summary of the invention The invention achieves frequency stability in systems with configurable oscillator temperature To achieve this, a system is provided to automatically and integrally calibrate the oscillator temperature. It will be done. Temperature calibration is performed by calculating the current optimal operating temperature of the oscillator using the integral method, and carried out by resetting the temperature of the shaker to the optimum temperature by an integral method. . Therefore, the stability of the frequency stability relationship is achieved and then the frequency can be calibrated. becomes.
図面の簡単な説明 本発明に基づく典型的なシステムを、下記の添付図を参照して、単に例として示 す： 第１図は、水晶の温度に対する典型的な周波数偏移特性を表すグラフである。Brief description of the drawing A typical system according to the invention is illustrated by way of example only with reference to the accompanying figures below. vinegar: FIG. 1 is a graph showing typical frequency shift characteristics with respect to temperature of a crystal.
第２図は、本発明を組み込む周波数合成型ラジオのブロック図である。FIG. 2 is a block diagram of a frequency synthesis radio incorporating the present invention.
第３図は、本発明に基づき構成された、第２図の処理装置のブロック図である。FIG. 3 is a block diagram of the processing apparatus of FIG. 2 constructed in accordance with the present invention.
第４図は、本発明の第２の側面に基づく位相同期ループのブロック図である。FIG. 4 is a block diagram of a phase-locked loop according to the second aspect of the invention.
発明を実施するための最良の形態 第２図は、本発明を組み込む周波数合成型ラジオのブロック図である。この周波 数合成型ラジオは、基準周波数を提供する周波数発振器１０、第１中間周波ミク サおよび第２中間周波ミクサ１４．１６のために第１インジェクション周波数お よび第２インジェクション周波数を提供してそのプログラマブル周波数分割器が プロセッサ１８からロード可能なシンセサイザ１２、ならびに復調器２０を含ん でおり、このラジオの通常の可聴音出力は、周波数偏移および較正に関する情報 をプロセッサに提供するために本発明に従って効果的に使用される。BEST MODE FOR CARRYING OUT THE INVENTION FIG. 2 is a block diagram of a frequency synthesis radio incorporating the present invention. this frequency The number synthesis type radio includes a frequency oscillator 10 providing a reference frequency, a first intermediate frequency microphone the first injection frequency and the second intermediate frequency mixer 14.16. and a second injection frequency, the programmable frequency divider It includes a synthesizer 12 loadable from a processor 18, as well as a demodulator 20. and the normal audible sound output of this radio contains information about frequency deviation and calibration. is advantageously used in accordance with the present invention to provide a processor with:
この周波数合成型ラジオの発振器１０は、無線受信機が受信する外部基準周波数 とそれ自体の内部基準周波数との間の周波数誤差がベースバンドに変換され、受 信周波数対基準周波数の比率で逓倍されるので、正確に較正できる。The oscillator 10 of this frequency-synthesizing radio uses an external reference frequency that is received by the radio receiver. and its own internal reference frequency is converted to baseband and Since the signal frequency is multiplied by the ratio of the signal frequency to the reference frequency, it can be calibrated accurately.
このため、内部基準周波数が１１．４ＭＨｚで、受信機が１０ＭＨ２に同調され ており、外部周波数が１０．００１ＭＨ２である場合には、約１ＫＨ２のトーン が可聴音出力から導出される−−０，１［）ｍの発振器誤差は可聴音出力ではｉ ｏｏｏｐｐｍの偏移として反映される。このような周波数誤差の逓倍は、低価格 の水晶によってクロックが提供される簡素なマイクロプロセッサでも、簡単に可 聴音出力で測定される。Therefore, the internal reference frequency is 11.4MHz and the receiver is tuned to 10MH2. and if the external frequency is 10.001MH2, then the tone of approximately 1KH2 is derived from the audible output.The oscillator error of −0,1[)m is i It is reflected as a deviation of oooppm. Such frequency error multiplication can be done at low cost. Even a simple microprocessor whose clock is provided by a crystal can easily Measured by auditory output.
第３図は、本発明に従って構成された、第２図のプロセッサ１８のブロック図で ある。このプロセッサは、受信機の可聴音出力に結合されたマイクロプロセッサ ２２を含んであり、本発明に基づき、周波数偏移および較正に関する情報をプロ セッサに提供するために使用されており、ざらに、温度較正および周波数較正に 関する情報を発振器に提供するために、デジタル・アナログ変換器２４．２６を 含んでいる。FIG. 3 is a block diagram of processor 18 of FIG. 2 constructed in accordance with the present invention. be. This processor is a microprocessor coupled to the audible output of the receiver. 22, and according to the present invention, information regarding frequency deviation and calibration is programmed. It is used to provide temperature calibration and frequency calibration. A digital-to-analog converter 24.26 is used to provide information to the oscillator regarding Contains.
発振器を較正するため、受信機は較正周波数（較正されたトランスミッタ、外部 精密試験計器、または送信された周波数標準から受信した周波数−一時間および 周波数の基−単信号は通常、航行および時刻を知る目的のためにＨＦバンドで得 られる）に同調される。つぎに、温度ＤＡ変換器２４を使用することによって生 成される電圧を変化させ、発振器１０のオーブン温度を、最低温度から最高温度 までの設計範囲にわたり動作させる。それぞれの電圧変化の後、オーブン温度が 安定化するのに充分な時間が経過した後、周波数偏移の変化が可聴音出力で測定 され、記録される（マイクロプロセッサは、デジタル周波数サンプリング技術を 用いて、前記の合成周波数偏移を記録するのに用いる）。いったん、充分な数の 周波数／温度の点が記録されたならば（たとえば、第１図の放物曲線近似法には 最低３点が必要）、周波数偏移が最少となるオーブン温度が決定できる。また、 第１図の基本放物特性の場合、前記最適温度（傾きがゼロの場合）は、 放物線ｆ＝Ａｔ＊＊２＋Ｂｔ＋ｃの係数から算定される。ここで：Ｔｃａｌ １ ｂｒａｔｉｏｎ＝−３／２Ａ またここで＾＝［（ｆｌ−ｆｏ）（ｔ２−ｔＯ） −（ｆ２−ｆＯ）（ｔｌ−ｔＯ）］／（ｔｌ−ｔｏ）（ｔ２−ｔＯ）（ｔｌ−ｔ ２） および Ｂ＝［ｆ２−ｆＯ−Ａ（ｔ２＊＊２−ｔＯ＊＊２）］／１２−ｔＯであり、これ らは温度／周波数の組（ｔｏ、 ｆｏ）、 （ｔＬ ｆｌ）および（ｔ２．ｆ２ ）を基にしている。To calibrate the oscillator, the receiver uses the calibration frequency (calibrated transmitter, external Frequency received from precision test instrument or transmitted frequency standard - one hour and Frequency Base - Single signals are usually obtained in the HF band for navigation and time-telling purposes. be attuned to). Next, by using the temperature DA converter 24, By changing the voltage generated, the oven temperature of the oscillator 10 can be changed from the lowest temperature to the highest temperature. Operate over the design range up to. After each voltage change, the oven temperature After sufficient time to stabilize, the change in frequency deviation is measured in the audible output (The microprocessor uses digital frequency sampling techniques to (used to record the composite frequency shift). Once a sufficient number of Once the frequency/temperature points have been recorded (e.g., the parabolic curve approximation method in Figure 1 (requires at least 3 points), the oven temperature at which the frequency deviation is minimum can be determined. Also, In the case of the basic parabolic characteristic shown in Figure 1, the optimum temperature (when the slope is zero) is It is calculated from the coefficient of the parabola f=At**2+Bt+c. Where: Tcal 1 bration=-3/2A Also here ^=[(fl-fo)(t2-tO) -(f2-fO)(tl-tO)]/(tl-to)(t2-tO)(tl-t 2) and B=[f2-fO-A(t2**2-tO**2)]/12-tO, which is are temperature/frequency pairs (to, fo), (tL fl) and (t2.f2 ) is based on.
最後に、最適温度Ｔｃａ ｌ ｉ ｂｒａｔ ｉ Ｏｎに対応する電圧は、温度 Ｄ／Ａ２４を通じて生成され、周波数同調Ｄ／Ａ ２６は、可聴音出力で測定さ れた周波数偏移が消えるまで調整される（発振器内のバリキャップ・ダイオード 上の電圧を変化させる）。較正は、温度Ｄ／Ａおよび周波数同調Ｄ／Ａの両方の 値が不揮発性メモリに格納されると完了する。Finally, the voltage corresponding to the optimal temperature Tca l i brat i On is determined by the temperature D/A 24 and frequency tuned D/A 26 are measured with audible output. (varicap diode in the oscillator) until the frequency deviation ). Calibration includes both temperature D/A and frequency tuning D/A. Complete when the value is stored in non-volatile memory.
従って、提供されるのは、発振器の温度が５２定可能な周波数合成型ラジオ内で 周波数精度および安定度を達成するために、発振器の温度を自動的かつ積分法に より較正するシステムである。温度較正は、発振器の現在の最適動作温度を積分 法によって決定し、発振器の温度を前記最適温度に積分法によりリセットするこ とによって実行される。このため、周波数／温度関係の安定度が達成され、つい で周波数較正を行うことができる。Therefore, what is provided is a frequency-synthesizing radio in which the temperature of the oscillator can be set at 52 degrees. Automatically and integrally adjust oscillator temperature to achieve frequency accuracy and stability It is a more calibrated system. Temperature calibration integrates the current optimal operating temperature of the oscillator the temperature of the oscillator is determined by the method and the temperature of the oscillator is reset to the optimum temperature by the integral method. It is executed by Therefore, stability in the frequency/temperature relationship is achieved and Frequency calibration can be performed with
本発明の較正方法は、オーブン温度が制御されない発振器を含め、周波数精度お よび安定度か重要ないずれの発振器でも使用に適している。特に、水晶のエージ ングを補正するための環境での周波数調節にとって効果がある。The calibration method of the present invention improves frequency accuracy and Suitable for use in any oscillator where safety and stability are important. Especially, Crystal Age It is effective for frequency adjustment in the environment to compensate for noise.
第４図について言えば、ラジオの位相同期ループ（Ｐ。Referring to FIG. 4, the radio phase-locked loop (P.
Ｌ、 Ｌ、 ）が、位相検波器（Ｐ、Ｄ、＞３０、低域通過フィルタ（Ｌ、Ｐ、 Ｆ、＞３２および電圧制御発掘器（Ｖ。L, L, ) are phase detectors (P, D, >30, low-pass filters (L, P, F, >32 and voltage-controlled excavator (V.
Ｃ，Ｏ，＞３４から構成されていることを示している。通常の動作においては、 位相検波器３０が基準周波数人力ｆＯを受信し、マイクロプロセッサ３６がＶ、 Ｃ，０，３４の周波数を読み取り、Ａ／Ｄ変換器３８にデジタル制御ワードを提 供する。ついでこの変換器がＶ、Ｃ，Ｏ，の電圧入力を制御して、閉ループ制御 回路を提供する。中心周波数はコンデンサｃｏおよび抵抗Ｒ８によって設定され る。It shows that it is composed of C, O, >34. In normal operation, The phase detector 30 receives the reference frequency fO, and the microprocessor 36 receives the reference frequency fO. Reads the frequency of C, 0, 34 and provides a digital control word to the A/D converter 38. provide This converter then controls the voltage inputs of V, C, and O to provide closed loop control. Provide the circuit. The center frequency is set by capacitor co and resistor R8. Ru.
Ｄ／Ａという手段によって電流Ｉを変化させることによって、システムは中心周 波数を所望の値に調節する。By varying the current I by means of a D/A, the system Adjust the wavenumber to the desired value.
本発明により、Ｐ、Ｌ、ｌ 、への入力を切断するための手段が、スイッチＳＷ Ｉの形態で提供され、位相検波器３０を中和するための手段が、スイッチＳＷ２ の形態で提供される。本発明に基づく動作は下記のとおりである。マイクロプロ セッサ３６は、試験モードを入力し、スイッチＳＷ１を開き、スイッチＳＷ２を 閉じる。マイクロプロセッサはＶ、Ｃ，０，３４から周波数を読み取り、これを 、メモリ内に予めプログラムされている所望の周波数と比較する。これらの周波 数が符合しない場合、Ｖ、Ｃ，Ｏ，の周波数は下記の２つの方法の内の１つによ って訂正される：ａ）Ｄ／Ａ３８は、マイクロプロセッサが正しい周波数を読み 取るまで、電流Ｉを変化させる；またはｂ）マイクロプロセッサは、所望の周波 数からの偏移を計算し、訂正を行うために必要なデジタル・ワードを提供し、そ の後新しい周波数をチェックし、必要に応じてこのプロセスを繰り返す。According to the present invention, the means for disconnecting the inputs to P, L, l, is provided by the switch SW. Means for neutralizing the phase detector 30 are provided in the form of a switch SW2 provided in the form of The operation according to the present invention is as follows. micro pro The processor 36 enters the test mode, opens the switch SW1, and opens the switch SW2. close. The microprocessor reads the frequency from V,C,0,34 and converts it to , and the desired frequency pre-programmed in memory. these frequencies If the numbers do not match, the frequencies of V, C, and O can be determined in one of two ways: Corrected: a) The D/A38 is corrected by the microprocessor reading the correct frequency. or b) the microprocessor changes the current I until the desired frequency Provides the necessary digital words to calculate deviations from numbers and make corrections; Check the new frequency after and repeat this process if necessary.
この手順によって、中心周波数を高い精度に調節する機能が提供される。この調 節は、Ｐ、Ｌ、Ｌ、の中心周波数の安定度を確保するため、いつでも所望のとき に行うことができる。This procedure provides the ability to adjust the center frequency with high precision. This key nodes at any time desired to ensure the stability of the center frequencies of P, L, and L. can be done.
本発明の好適な実施例の位相同期ループはラジオに関して記述されているが、本 発明は、位相同期ループを利用し、その都度較正が望まれる多くの機械に適用で きる。Although the phase-locked loop of the preferred embodiment of the present invention is described with respect to a radio, The invention utilizes a phase-locked loop and can be applied to many machines where calibration is desired each time. Wear.
本発明の好適な実施例を示したが、当業者には、本発明のその他のバリエーショ ンおよび変更態様が実現可能で必ることが理解されるであろう。Having shown a preferred embodiment of the invention, those skilled in the art will appreciate that there are other variations of the invention. It will be understood that modifications and variations are necessarily possible.
ラシーオｌｉ、ｌｌイ吐〜 国際調査報告Lashio li, ll vomit~ international search report
Claims (19)
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| GB8812773.3 | 1988-05-28 | ||
| GB8812773A GB2220317B (en) | 1988-05-28 | 1988-05-28 | Automatically self-calibrating oscillators in heterodyned radio receivers |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04504035A true JPH04504035A (en) | 1992-07-16 |
| JP2814638B2 JP2814638B2 (en) | 1998-10-27 |
Family
ID=10637774
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1506396A Expired - Lifetime JP2814638B2 (en) | 1988-05-28 | 1989-05-25 | Automatic oscillator calibration in heterodyne radio receivers. |
Country Status (6)
| Country | Link |
|---|---|
| JP (1) | JP2814638B2 (en) |
| KR (1) | KR900702657A (en) |
| GB (2) | GB2220317B (en) |
| HK (2) | HK87695A (en) |
| SG (2) | SG22895G (en) |
| WO (1) | WO1989011756A1 (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| DE4209843A1 (en) * | 1992-03-26 | 1993-11-18 | Telefunken Microelectron | Temp. compensated oscillator circuit - stores tuning element setting signal and corresponding temp. signal during calibration phase for subsequent provision of correction signal |
| GB2273405B (en) * | 1992-12-10 | 1996-12-04 | Motorola Israel Ltd | A communications device and method of calibration therefor |
| JP2689909B2 (en) * | 1994-07-25 | 1997-12-10 | 日本電気株式会社 | Frequency control circuit |
| US6606009B2 (en) * | 2001-03-08 | 2003-08-12 | Schlumberger Technology Corporation | Self-compensating ovenized clock adapted for wellbore applications |
| GB0110497D0 (en) | 2001-04-28 | 2001-06-20 | Mitel Semiconductor Ltd | Tuner and method of aligning a tuner |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS61220527A (en) * | 1985-03-26 | 1986-09-30 | Fujitsu Ltd | Crystal oscillator |
| JPS623527A (en) * | 1985-06-29 | 1987-01-09 | Nec Corp | Piezoelectric oscillator with constant temperature oven |
| JPS62116003A (en) * | 1985-11-15 | 1987-05-27 | Fujitsu Ltd | Oscillator |
| JPS6247240B2 (en) * | 1978-12-27 | 1987-10-07 | Roehm Gmbh | |
| JPS6355614B2 (en) * | 1982-10-25 | 1988-11-02 | Matsushita Electric Ind Co Ltd |
Family Cites Families (8)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| GB1600393A (en) * | 1977-09-23 | 1981-10-14 | Racal Res Ltd | Correcting oscillator output frequency for temperature variations |
| NL179435C (en) * | 1977-10-26 | 1986-09-01 | Philips Nv | RECEIVER WITH A FREQUENCY SYNTHESIS CIRCUIT. |
| GB2064248B (en) * | 1979-11-21 | 1984-05-16 | Philcom Electronics Blackburn | Temperature compensated crystal oscillators |
| JPS56126313A (en) * | 1980-03-10 | 1981-10-03 | Trio Kenwood Corp | Intermediate frequency control method for fm receiver |
| DE3441255A1 (en) * | 1984-11-12 | 1986-05-15 | Hagenuk GmbH, 2300 Kiel | OSCILLATOR CIRCUIT |
| DE3510559A1 (en) * | 1985-03-21 | 1986-09-25 | H. u. C. Elektronik Hansen & Co, 1000 Berlin | CIRCUIT FOR AUTOMATIC TUNING FOR FM RECEIVERS |
| DE3526363A1 (en) | 1985-07-19 | 1987-01-22 | Siemens Ag | METHOD FOR PRODUCING AN ADJUSTABLE FREQUENCY GENERATOR |
| US4746879A (en) * | 1986-08-28 | 1988-05-24 | Ma John Y | Digitally temperature compensated voltage-controlled oscillator |
-
1988
- 1988-05-28 GB GB8812773A patent/GB2220317B/en not_active Expired - Lifetime
-
1989
- 1989-05-25 JP JP1506396A patent/JP2814638B2/en not_active Expired - Lifetime
- 1989-05-25 WO PCT/US1989/002285 patent/WO1989011756A1/en unknown
-
1990
- 1990-01-23 KR KR1019900700124A patent/KR900702657A/en not_active Application Discontinuation
- 1990-08-30 GB GB9018896A patent/GB2244877B/en not_active Expired - Lifetime
-
1995
- 1995-02-11 SG SG22895A patent/SG22895G/en unknown
- 1995-02-11 SG SG22795A patent/SG22795G/en unknown
- 1995-06-01 HK HK87695A patent/HK87695A/en not_active IP Right Cessation
- 1995-06-01 HK HK87595A patent/HK87595A/en not_active IP Right Cessation
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS6247240B2 (en) * | 1978-12-27 | 1987-10-07 | Roehm Gmbh | |
| JPS6355614B2 (en) * | 1982-10-25 | 1988-11-02 | Matsushita Electric Ind Co Ltd | |
| JPS61220527A (en) * | 1985-03-26 | 1986-09-30 | Fujitsu Ltd | Crystal oscillator |
| JPS623527A (en) * | 1985-06-29 | 1987-01-09 | Nec Corp | Piezoelectric oscillator with constant temperature oven |
| JPS62116003A (en) * | 1985-11-15 | 1987-05-27 | Fujitsu Ltd | Oscillator |
Also Published As
| Publication number | Publication date |
|---|---|
| SG22795G (en) | 1995-06-16 |
| WO1989011756A1 (en) | 1989-11-30 |
| JP2814638B2 (en) | 1998-10-27 |
| SG22895G (en) | 1995-06-16 |
| GB2220317B (en) | 1992-07-22 |
| GB9018896D0 (en) | 1990-10-17 |
| GB8812773D0 (en) | 1988-06-29 |
| GB2244877B (en) | 1992-07-22 |
| KR900702657A (en) | 1990-12-08 |
| HK87595A (en) | 1995-06-09 |
| HK87695A (en) | 1995-06-09 |
| GB2220317A (en) | 1990-01-04 |
| GB2244877A (en) | 1991-12-11 |
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