JPH0758637A - Frequency synthesizer - Google Patents
Frequency synthesizerInfo
- Publication number
- JPH0758637A JPH0758637A JP5222213A JP22221393A JPH0758637A JP H0758637 A JPH0758637 A JP H0758637A JP 5222213 A JP5222213 A JP 5222213A JP 22221393 A JP22221393 A JP 22221393A JP H0758637 A JPH0758637 A JP H0758637A
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- vco
- control voltage
- capacitor
- capacitance
- 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
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/09—Modifications of modulator for regulating the mean frequency
- H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
- H03C3/095—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation to the loop in front of the voltage controlled oscillator
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/09—Modifications of modulator for regulating the mean frequency
- H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
- H03C3/0916—Modifications of modulator for regulating the mean frequency using a phase locked loop with frequency divider or counter in the loop
- H03C3/0925—Modifications of modulator for regulating the mean frequency using a phase locked loop with frequency divider or counter in the loop applying frequency modulation at the divider in the feedback loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03C—MODULATION
- H03C3/00—Angle modulation
- H03C3/02—Details
- H03C3/09—Modifications of modulator for regulating the mean frequency
- H03C3/0908—Modifications of modulator for regulating the mean frequency using a phase locked loop
- H03C3/0941—Modifications of modulator for regulating the mean frequency using a phase locked loop applying frequency modulation at more than one point in the loop
-
- 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
- H03L7/099—Details of the phase-locked loop concerning mainly the controlled oscillator of the loop
-
- 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
- H03L7/16—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop
- H03L7/18—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop
- H03L7/183—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number
- H03L7/187—Indirect frequency synthesis, i.e. generating a desired one of a number of predetermined frequencies using a frequency- or phase-locked loop using a frequency divider or counter in the loop a time difference being used for locking the loop, the counter counting between fixed numbers or the frequency divider dividing by a fixed number using means for coarse tuning the voltage controlled oscillator of the loop
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03L—AUTOMATIC CONTROL, STARTING, SYNCHRONISATION, OR STABILISATION OF GENERATORS OF ELECTRONIC OSCILLATIONS OR PULSES
- H03L2207/00—Indexing scheme relating to automatic control of frequency or phase and to synchronisation
- H03L2207/06—Phase locked loops with a controlled oscillator having at least two frequency control terminals
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
Abstract
Description
【０００１】[0001]
【産業上の利用分野】本発明は周波数シンセサイザに関
し、特にディジタル変復調を行う無線通信に用いる周波
数シンセサイザに関する。BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a frequency synthesizer, and more particularly to a frequency synthesizer used for wireless communication for digital modulation / demodulation.
【０００２】[0002]
【従来の技術】周波数シンセサイザは、その内部に備え
た電圧制御発振器（以下ＶＣＯという）への制御電圧を
調節することによって所望周波数の信号を出力するもの
である。2. Description of the Related Art A frequency synthesizer outputs a signal of a desired frequency by adjusting a control voltage to a voltage controlled oscillator (hereinafter referred to as VCO) provided therein.
【０００３】図３は従来の周波数シンセサイザのブロッ
ク図である。FIG. 3 is a block diagram of a conventional frequency synthesizer.
【０００４】周波数シンセサイザ１ａは、基準信号を発
振する基準発振器９と、要求される周波数に基づいて分
周器７の分周数Ｎを指定する制御部５ａと、制御部５ａ
で指定された分周数Ｎでバッファアンプ６からの信号を
分周する分周器７と、基準発振器９からの信号の位相と
分周器７からの信号の位相とを比較し比較結果を出力す
る位相比較器８と、位相比較器８の出力に基づいて位相
の進み／遅れの量を電圧に変換するチャージポンプ４
と、チャージポンプ４からの電圧のうち直流成分以外を
除去するローパスフィルタ３と、ローパスフィルタ３か
らの制御電圧に応じた周波数の信号を出力するＶＣＯ２
ａと、ＶＣＯ２ａからの信号を増幅するバッファアンプ
６および１０とから成る。The frequency synthesizer 1a includes a reference oscillator 9 that oscillates a reference signal, a control unit 5a that specifies the frequency division number N of the frequency divider 7 based on a required frequency, and a control unit 5a.
The frequency divider 7 that divides the signal from the buffer amplifier 6 by the frequency division number N specified in step 1 and the phase of the signal from the reference oscillator 9 and the phase of the signal from the frequency divider 7 are compared, and the comparison result is shown. A phase comparator 8 for outputting and a charge pump 4 for converting the amount of lead / lag of the phase into a voltage based on the output of the phase comparator 8.
And a low-pass filter 3 that removes components other than the DC component of the voltage from the charge pump 4, and a VCO 2 that outputs a signal having a frequency according to the control voltage from the low-pass filter 3.
a and buffer amplifiers 6 and 10 for amplifying the signal from the VCO 2a.
【０００５】ＶＣＯ２ａは、可変容量ダイオード２３ａ
と、コンデンサ２２ａ、と発振部２１ａとから成り、端
子２７ａに印加される制御電圧に応じて可変容量ダイオ
ード２３ａのキャパシタンスを変化させ、発振する周波
数を変化させる。The VCO 2a is a variable capacitance diode 23a.
The capacitor 22a and the oscillator 21a change the capacitance of the variable capacitance diode 23a according to the control voltage applied to the terminal 27a to change the oscillation frequency.
【０００６】図４は、図３に示したＶＣＯ２ａの制御電
圧−発振周波数特性を示すグラフである。FIG. 4 is a graph showing control voltage-oscillation frequency characteristics of the VCO 2a shown in FIG.
【０００７】図４において、横軸は端子２７ａに印加さ
れる制御電圧であり、縦軸は端子２６ａから出力する信
号の発振周波数である。図４に示すように、制御電圧を
Ｖ1からＶ2 へと変化させると、発振周波数はｆ1 から
ｆ2 へと変化する。In FIG. 4, the horizontal axis is the control voltage applied to the terminal 27a, and the vertical axis is the oscillation frequency of the signal output from the terminal 26a. As shown in FIG. 4, when the control voltage is changed from V 1 to V 2 , the oscillation frequency changes from f 1 to f 2 .
【０００８】[0008]
【発明が解決しようとする課題】最近では、周波数シン
セサイザを使用する無線機において、広帯域のものが求
められている。このため周波数シンセサイザも１つで広
帯域の周波数を発振するものが求められる。Recently, a wireless device using a frequency synthesizer is required to have a wide band. Therefore, one frequency synthesizer is required to oscillate a wide band frequency.
【０００９】ところで、図４に示したように、従来の周
波数シンセサイザはＶＣＯの発振周波数と制御電圧が１
対１に対応しているので、発振周波数の帯域を広くする
ためには、制御電圧−発振周波数特性の曲線の傾き、す
なわち変調感度を大きくし制御電圧が少し変化しただけ
で発振周波数が大きく変化するようにする必要がある。By the way, as shown in FIG. 4, in the conventional frequency synthesizer, the oscillation frequency of the VCO and the control voltage are 1.
Since it corresponds to 1: 1, in order to widen the oscillation frequency band, the slope of the curve of the control voltage-oscillation frequency characteristic, that is, the modulation sensitivity is increased and the oscillation frequency changes greatly even if the control voltage slightly changes. Need to do.
【００１０】しかし、このような周波数シンセサイザで
は、ＶＣＯの制御電圧ラインから廻り込んでくるノイズ
がそのままＶＣＯの出力の位相ノイズとなって現れてし
まい、この位相ノイズの影響はＱＰＳＫ（四相差動位相
変調）やＭＳＫ（最小偏移変調）等のディジタル変調を
行う無線機にとっては致命的な問題である。However, in such a frequency synthesizer, the noise sneaking from the control voltage line of the VCO appears as the phase noise of the output of the VCO as it is, and the influence of this phase noise is QPSK (four-phase differential phase). This is a fatal problem for a wireless device that performs digital modulation such as modulation) or MSK (minimum shift keying).
【００１１】本発明は上記の点にかんがみてなされたも
ので、広い周波数帯域を確保しつつＶＣＯの制御電圧ラ
インから廻り込んでくるノイズの影響による位相ノイズ
を低減した周波数シンセサイザを提供することを目的と
する。The present invention has been made in view of the above points, and it is an object of the present invention to provide a frequency synthesizer which secures a wide frequency band and reduces the phase noise due to the influence of noise sneaking from the control voltage line of the VCO. To aim.
【００１２】[0012]
【課題を解決するための手段】本発明は上記の目的を達
成するために、供給される制御電圧に応じて可変容量ダ
イオードのキャパシタンスを変化させることでキャパシ
タンス成分を変化させ周波数を可変発振する電圧制御発
振器を有する周波数シンセサイザにおいて、前記制御電
圧による前記可変容量ダイオードのキャパシタンス変化
とは別に、前記電圧制御発振器の前記キャパシタンス成
分を変化させるキャパシタンス可変手段を設けた。SUMMARY OF THE INVENTION In order to achieve the above object, the present invention changes the capacitance of a variable capacitance diode according to a supplied control voltage to change a capacitance component and oscillate a frequency variably. In a frequency synthesizer having a controlled oscillator, a capacitance varying means for varying the capacitance component of the voltage controlled oscillator is provided in addition to the capacitance variation of the variable capacitance diode due to the control voltage.
【００１３】[0013]
【作用】本発明は以上の構成によって、キャパシタンス
可変手段により電圧制御発振器のキャパシタンス成分を
変化させることにより、制御電圧の変化による発振周波
数の変化幅が小さくても広帯域の周波数を発振すること
ができる。According to the present invention, by changing the capacitance component of the voltage controlled oscillator by the capacitance varying means, it is possible to oscillate a wide band frequency even if the change width of the oscillation frequency due to the change of the control voltage is small. .
【００１４】[0014]
【実施例】以下本発明を図面に基づいて説明する。DESCRIPTION OF THE PREFERRED EMBODIMENTS The present invention will be described below with reference to the drawings.
【００１５】図１は本発明による周波数シンセサイザの
ブロック図である。FIG. 1 is a block diagram of a frequency synthesizer according to the present invention.
【００１６】周波数シンセサイザ１は、基準信号を発振
する基準発振器９と、要求される周波数に基づいて分周
器７の分周数Ｎを指定するとともにＶＣＯ２内のスイッ
チ２５のＯＮ／ＯＦＦ制御を行う制御部５と、制御部５
で指定された分周数Ｎでバッファアンプ６からの信号を
分周する分周器７と、基準発振器９からの信号の位相と
分周器７からの信号の位相とを比較し比較結果を出力す
る位相比較器８と、位相比較器８の出力に基づいて位相
の進み／遅れの量を電圧に変換するチャージポンプ４
と、チャージポンプ４からの電圧のうち直流成分以外を
除去するローパスフィルタ３と、ローパスフィルタ３か
らの制御電圧に応じた周波数の信号を出力するＶＣＯ２
と、ＶＣＯ２からの信号を増幅するバッファアンプ６お
よび１０とから成る。The frequency synthesizer 1 designates a reference oscillator 9 which oscillates a reference signal, a frequency division number N of the frequency divider 7 based on a required frequency, and controls ON / OFF of a switch 25 in the VCO 2. Control unit 5 and control unit 5
The frequency divider 7 that divides the signal from the buffer amplifier 6 by the frequency division number N specified in step 1 and the phase of the signal from the reference oscillator 9 and the phase of the signal from the frequency divider 7 are compared, and the comparison result is shown. A phase comparator 8 for outputting and a charge pump 4 for converting the amount of lead / lag of the phase into a voltage based on the output of the phase comparator 8.
And a low-pass filter 3 that removes components other than the DC component of the voltage from the charge pump 4, and a VCO 2 that outputs a signal having a frequency according to the control voltage from the low-pass filter 3.
And buffer amplifiers 6 and 10 for amplifying the signal from the VCO 2.
【００１７】ＶＣＯ２は、可変容量ダイオード２３と、
コンデンサ２２と、発振部２１と、発振部２１とコンデ
ンサ２２との間に一端が接続されたコンデンサ２４と、
コンデンサ２４とアースとの間に接続されたスイッチ２
５とから成り、端子２７に印加される制御電圧を調整す
ることにより可変容量ダイオード２３のキャパシタンス
を変化させ、発振する周波数を変化させる。The VCO 2 has a variable capacitance diode 23,
A capacitor 22, an oscillating unit 21, a capacitor 24 having one end connected between the oscillating unit 21 and the capacitor 22,
Switch 2 connected between capacitor 24 and ground
5, the capacitance of the variable capacitance diode 23 is changed by adjusting the control voltage applied to the terminal 27, and the oscillation frequency is changed.
【００１８】図２は、図１に示したＶＣＯ２の制御電圧
−発振周波数特性を示すグラフである。FIG. 2 is a graph showing the control voltage-oscillation frequency characteristic of the VCO 2 shown in FIG.
【００１９】図２において、横軸は端子２７に印加され
る制御電圧であり、縦軸は端子２６から出力する信号の
発振周波数である。曲線ａはスイッチ２５がＯＮのとき
の特性を示し、曲線ｂはスイッチ２５がＯＦＦのときの
特性を示す。In FIG. 2, the horizontal axis is the control voltage applied to the terminal 27, and the vertical axis is the oscillation frequency of the signal output from the terminal 26. The curve a shows the characteristic when the switch 25 is ON, and the curve b shows the characteristic when the switch 25 is OFF.
【００２０】ＶＣＯ２が発振する周波数は、制御部５が
要求される周波数に応じて端子２８を介してスイッチ２
５をＯＮにした場合には、図２の曲線ａに示すように制
御電圧をＶ1 からＶ2 へと変化させたときｆ1 からｆ4
へと変化し、制御部５が要求される周波数に応じて端子
２８を介してスイッチ２５をＯＦＦにした場合には、図
２の曲線ｂに示すように制御電圧をＶ1 からＶ2 へと変
化させたとき発振周波数はｆ3 からｆ2 へと変化する。The frequency at which the VCO 2 oscillates depends on the frequency required by the control section 5 and the switch 2 via the terminal 28.
When 5 is turned on, when the control voltage is changed from V 1 to V 2 as shown by the curve a in FIG. 2, f 1 to f 4
When the control unit 5 turns off the switch 25 via the terminal 28 according to the required frequency, the control voltage is changed from V 1 to V 2 as shown by the curve b in FIG. When changed, the oscillation frequency changes from f 3 to f 2 .
【００２１】すなわち、本実施例においては、スイッチ
２５がＯＮかＯＦＦかによってＶＣＯ２のキャパシタン
ス成分を異ならせ、１つの周波数シンセサイザで２種類
の制御電圧−発振周波数特性を有するようにし、この２
種類の制御電圧−発振周波数特性でｆ1 からのｆ2 まで
の周波数帯域をカバーしている。That is, in this embodiment, the capacitance component of the VCO 2 is made different depending on whether the switch 25 is ON or OFF so that one frequency synthesizer has two kinds of control voltage-oscillation frequency characteristics.
The control voltage-oscillation frequency characteristics of various types cover the frequency band from f 1 to f 2 .
【００２２】なお、本実施例では、コンデンサ２４を発
振部２１とコンデンサ２２との間に接続したが、本発明
はこれに限らずスイッチ２５のＯＮ／ＯＦＦでＶＣＯ２
のキャパシタンス成分を変化させることができればよ
い。In the present embodiment, the capacitor 24 is connected between the oscillator 21 and the capacitor 22, but the present invention is not limited to this, and the VCO2 can be turned ON / OFF by the switch 25.
It suffices if the capacitance component of can be changed.
【００２３】また、本実施例では、スイッチ（スイッチ
２５）のＯＦＦで回路から切り離されるコンデンサ（コ
ンデンサ２４）を１つだけ設けたが、本発明は、このよ
うなスイッチとコンデンサとを２組以上設けて３種類以
上の制御電圧−発振周波数特性を有するようにしてもよ
い。この制御電圧−発振周波数特性の種類を多くすれば
するほど個々の制御電圧−発振周波数特性の傾きを小さ
くすることができる。Further, in the present embodiment, only one capacitor (capacitor 24) which is disconnected from the circuit when the switch (switch 25) is turned off is provided, but the present invention provides two or more sets of such switch and capacitor. It may be provided so as to have three or more kinds of control voltage-oscillation frequency characteristics. The slope of each control voltage-oscillation frequency characteristic can be made smaller as the number of types of the control voltage-oscillation frequency characteristic is increased.
【００２４】さらに、スイッチ２５は機械的スイッチで
あっても電子的スイッチであってもかまわない。Further, the switch 25 may be a mechanical switch or an electronic switch.
【００２５】[0025]
【発明の効果】以上説明したように、本発明によれば、
ＶＣＯ内のスイッチのＯＮ／ＯＦＦによりＶＣＯの発振
周波数をシフトさせることで、同じ制御電圧に対して複
数の発振周波数を設定できるので、要求される周波数帯
域のすべてを単一の制御電圧−発振周波数特性でカバー
する従来の周波数シンセサイザに比べてＶＣＯの制御電
圧−発振周波数特性の曲線の傾き、すなわち変調感度を
小さく設定することができ、ＶＣＯの制御電圧ラインか
ら廻り込んでくるノイズがＶＣＯの出力の位相ノイズと
なって現れるのを低減することができる。As described above, according to the present invention,
Since multiple oscillation frequencies can be set for the same control voltage by shifting the oscillation frequency of the VCO by turning ON / OFF the switch in the VCO, all required frequency bands are controlled by a single control voltage-oscillation frequency. The slope of the curve of the control voltage-oscillation frequency characteristic of the VCO, that is, the modulation sensitivity can be set smaller than that of the conventional frequency synthesizer covered by the characteristics, and the noise sneaking in from the control voltage line of the VCO is output by the VCO. It is possible to reduce the appearance of the phase noise of.
【００２６】このように、本発明によれば、周波数シン
セサイザの出力の位相ノイズを低減することができるの
で、ＱＰＳＫやＭＳＫ等のディジタル変調を行う無線機
に適した周波数シンセサイザを実現することができる。As described above, according to the present invention, since the phase noise of the output of the frequency synthesizer can be reduced, it is possible to realize a frequency synthesizer suitable for a radio device for performing digital modulation such as QPSK or MSK. .
【図１】本発明による周波数シンセサイザのブロック図
である。FIG. 1 is a block diagram of a frequency synthesizer according to the present invention.
【図２】図１に示したＶＣＯの制御電圧−発振周波数特
性を示すグラフである。FIG. 2 is a graph showing control voltage-oscillation frequency characteristics of the VCO shown in FIG.
【図３】従来の周波数シンセサイザのブロック図であ
る。FIG. 3 is a block diagram of a conventional frequency synthesizer.
【図４】図３に示したＶＣＯの制御電圧−発振周波数特
性を示すグラフである。FIG. 4 is a graph showing control voltage-oscillation frequency characteristics of the VCO shown in FIG.
１ 周波数シンセサイザ ２ ＶＣＯ ３ ローパスフィルタ ４ チャージポンプ ５ 制御部 ６ バッファアンプ ７ 分周器 ８ 位相比較器 ９ 基準発振器 １０ バッファアンプ １１ 端子 ２１ 発振部 ２２ コンデンサ ２３ 可変容量ダイオード ２４ コンデンサ ２５ スイッチ ２６ 端子 ２７ 端子 ２８ 端子 1 Frequency Synthesizer 2 VCO 3 Low Pass Filter 4 Charge Pump 5 Control Section 6 Buffer Amplifier 7 Frequency Divider 8 Phase Comparator 9 Reference Oscillator 10 Buffer Amplifier 11 Terminal 21 Oscillation Section 22 Capacitor 23 Variable Capacitance Diode 24 Capacitor 25 Switch 26 Terminal 27 Terminal 28 terminals
───────────────────────────────────────────────────── フロントページの続き (51)Int.Cl.6 識別記号 庁内整理番号 ＦＩ 技術表示箇所 9297−5Ｋ Ｈ０４Ｌ 27/00 Ｚ ─────────────────────────────────────────────────── ─── Continuation of the front page (51) Int.Cl. 6 Identification number Office reference number FI technical display location 9297-5K H04L 27/00 Z
Claims (2)
イオードのキャパシタンスを変化させることでキャパシ
タンス成分を変化させ周波数を可変発振する電圧制御発
振器を有する周波数シンセサイザにおいて、 前記制御電圧による前記可変容量ダイオードのキャパシ
タンス変化とは別に、前記電圧制御発振器の前記キャパ
シタンス成分を変化させるキャパシタンス可変手段を設
けたことを特徴とする周波数シンセサイザ。1. A frequency synthesizer having a voltage controlled oscillator for varying a capacitance component by varying a capacitance of the variable capacitance diode according to a supplied control voltage to variably oscillate a frequency, the variable capacitance diode according to the control voltage. In addition to the capacitance change, the frequency synthesizer is provided with capacitance changing means for changing the capacitance component of the voltage controlled oscillator.
圧制御発振器のキャパシタンス成分を構成するコンデン
サと、ＯＮ時に前記コンデンサを前記電圧制御発振器に
接続しＯＦＦ時に前記コンデンサを前記電圧制御発振器
から切離すスイッチ回路と、該スイッチ回路のＯＮ／Ｏ
ＦＦを制御するスイッチ制御手段とから成ることを特徴
とする請求項１に記載の周波数シンセサイザ。2. The capacitance varying means includes a capacitor that constitutes a capacitance component of the voltage controlled oscillator, and a switch circuit that connects the capacitor to the voltage controlled oscillator when turned on and disconnects the capacitor from the voltage controlled oscillator when turned off. And ON / O of the switch circuit
The frequency synthesizer according to claim 1, further comprising switch control means for controlling the FF.
Priority Applications (3)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5222213A JPH0758637A (en) | 1993-08-13 | 1993-08-13 | Frequency synthesizer |
| GB9525281A GB2294830A (en) | 1993-08-13 | 1994-08-12 | Frequency synthesizer |
| GB9416381A GB2282285A (en) | 1993-08-13 | 1994-08-12 | VCO; Frequency synthesizers |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5222213A JPH0758637A (en) | 1993-08-13 | 1993-08-13 | Frequency synthesizer |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0758637A true JPH0758637A (en) | 1995-03-03 |
Family
ID=16778910
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5222213A Pending JPH0758637A (en) | 1993-08-13 | 1993-08-13 | Frequency synthesizer |
Country Status (2)
| Country | Link |
|---|---|
| JP (1) | JPH0758637A (en) |
| GB (1) | GB2282285A (en) |
Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP1271763B1 (en) * | 1995-12-25 | 2006-04-19 | Matsushita Electric Industrial Co., Ltd. | High frequency apparatus |
| JP3488180B2 (en) * | 2000-05-30 | 2004-01-19 | 松下電器産業株式会社 | Frequency synthesizer |
| GB2370167B (en) * | 2000-12-18 | 2005-01-05 | Texas Instruments Ltd | Improvements in or relating to phase locked loops |
| DE10122194A1 (en) * | 2001-05-08 | 2002-11-28 | Infineon Technologies Ag | Phase-locked loop |
| US6873214B2 (en) | 2002-05-03 | 2005-03-29 | Texas Instruments Incorporated | Use of configurable capacitors to tune a self biased phase locked loop |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5676639A (en) * | 1979-11-27 | 1981-06-24 | Trio Kenwood Corp | Synthesizer receiver |
Family Cites Families (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| FR2511563B1 (en) * | 1981-08-14 | 1986-05-16 | Trt Telecom Radio Electr | PHASE LOCKING DEVICE FOR PROVIDING SIGNALS WHOSE FREQUENCY MAY VARY ON A WIDE RANGE |
| GB2120478B (en) * | 1982-04-22 | 1985-10-16 | Standard Telephones Cables Ltd | Voltage controlled oscillator |
| US4510465A (en) * | 1983-08-12 | 1985-04-09 | Motorola, Inc. | Linear gain voltage controlled oscillator with modulation compensation |
-
1993
- 1993-08-13 JP JP5222213A patent/JPH0758637A/en active Pending
-
1994
- 1994-08-12 GB GB9416381A patent/GB2282285A/en not_active Withdrawn
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5676639A (en) * | 1979-11-27 | 1981-06-24 | Trio Kenwood Corp | Synthesizer receiver |
Also Published As
| Publication number | Publication date |
|---|---|
| GB2282285A (en) | 1995-03-29 |
| GB9416381D0 (en) | 1994-10-05 |
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| Date | Code | Title | Description |
|---|---|---|---|
| A02 | Decision of refusal |
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