JPH024018A - Phase locked loop circuit - Google Patents
Phase locked loop circuitInfo
- Publication number
- JPH024018A JPH024018A JP63151619A JP15161988A JPH024018A JP H024018 A JPH024018 A JP H024018A JP 63151619 A JP63151619 A JP 63151619A JP 15161988 A JP15161988 A JP 15161988A JP H024018 A JPH024018 A JP H024018A
- Authority
- JP
- Japan
- Prior art keywords
- phase
- level
- output
- phase comparator
- signal
- 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
- 230000003213 activating effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 5
- 230000000694 effects Effects 0.000 description 2
- 230000001360 synchronised effect Effects 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
- 230000014759 maintenance of location Effects 0.000 description 1
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の、tl」用分野
本発明は、周波数シンセサイザ、位相同期回路2器等に
利用される位相同期回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a phase synchronized circuit used in a frequency synthesizer, two phase synchronized circuits, and the like.
従来の技術
位相同期回路は、周波数シンセサイザをはじめ各種機器
・装置に広く利用されている。高周波回路においては、
電圧制御発振器(VCO) 、分周器、基貼発振器、位
相比較器、ループフィルタ(低域通過フィルタ)で構成
される。2. Description of the Related Art Phase-locked circuits are widely used in various devices and devices including frequency synthesizers. In high frequency circuits,
It consists of a voltage controlled oscillator (VCO), frequency divider, base oscillator, phase comparator, and loop filter (low-pass filter).
第2図にそれらの構成を示す。第2図において、1は電
圧制御発振器(VCO) 、2は面周波出力端子、3は
電圧制御発振器1の出力を分周する分周器、4は位相比
較器(PD)である。5は基塾発振器(通常/11□4
度補償水晶発乃〈器(T(、”XO)が用いられる)で
、その出力を分周器6で分周して位相比較器4に入力す
る。位相比較器4は分周器3の出力(FV) 、分周器
6の出力(F R)の2つの出力位相を検出して、その
出力をループフィルタ7を通して高域成分を除去して電
圧制御発振器1に帰還する。Figure 2 shows their configuration. In FIG. 2, 1 is a voltage controlled oscillator (VCO), 2 is a surface frequency output terminal, 3 is a frequency divider that divides the output of the voltage controlled oscillator 1, and 4 is a phase comparator (PD). 5 is the basic school oscillator (normal/11□4
The output of the frequency compensating crystal oscillator (T(,"XO) is used) is divided by the frequency divider 6 and inputted to the phase comparator 4. The two output phases of the output (FV) and the output (FR) of the frequency divider 6 are detected, and the output is passed through a loop filter 7 to remove high frequency components and fed back to the voltage controlled oscillator 1.
次に、上記構成図中の位相比較器4の従来の回路図を第
3図に示す。位相比較器の役割は、各論理回路31〜4
2により、2周波の入力の位相あるいは周波数差を検出
し、それを位相の進みや遅れあるいは周波数の高低を弁
別し出力するものである。Next, a conventional circuit diagram of the phase comparator 4 in the above configuration diagram is shown in FIG. The role of the phase comparator is for each logic circuit 31 to 4.
2 detects the phase or frequency difference between two input frequencies, distinguishes phase lead or lag, or high or low frequency, and outputs it.
第3図に示す位相比較器のタイミングチャートを第4図
に示す。FVがFRより位相が進んでいる時は、φVK
″1”出力、φRId”0”出力となり、逆にFRがF
Vより位相が進んでいる時は、φRに”1″出力、φV
は”0″出力となる。まだ位相が完全に一致した時は、
φV、φRとも0”レベルの状態にある。FIG. 4 shows a timing chart of the phase comparator shown in FIG. 3. When FV is ahead of FR in phase, φVK
“1” output, φRId “0” output, conversely FR becomes F
When the phase is ahead of V, output “1” to φR, φV
outputs "0". When the phases still match perfectly,
Both φV and φR are at 0'' level.
発明が解決しようとする課題
従来の位相比較器を用いた位相同期回路では、起動時K
FR,FVの入力が不確定であり初期状態が決まらず、
従ってφR1φVの出力も不確定となるだめ、ループが
安定するまでの時間(引き込み時間)が長くなる。そこ
で、起動時に位相比較器入力の2周波の位相を強制的に
あわせてから位相同期回路を形成するという初期位相整
合回路が考えられている。この回路は、起動時にFVが
F’Hの位相より進んでいる時は、その時間φV信号に
より電圧制御発振器側の位相比較器入力を止める。捷た
逆KFRがFVの位■」より進んでいる時は、その時間
φR倍信号より基部発振器側の位相比較器入力を止める
ことで初期位相をあわせるものである。Problems to be Solved by the Invention In a phase-locked circuit using a conventional phase comparator, K
The inputs of FR and FV are uncertain and the initial state cannot be determined.
Therefore, the output of φR1φV also becomes uncertain, and the time it takes for the loop to stabilize (the pull-in time) becomes longer. Therefore, an initial phase matching circuit has been proposed in which the phases of the two frequencies input to the phase comparator are forcibly matched at startup, and then a phase synchronization circuit is formed. In this circuit, when FV is ahead of the phase of F'H at startup, the input to the phase comparator on the voltage controlled oscillator side is stopped by the φV signal for that time. When the shunted inverse KFR is ahead of the FV order, the initial phase is adjusted by stopping the phase comparator input on the base oscillator side from the time φR multiplied signal.
(−かし、従来の位相比較器動作では起動時の初期状態
が決定しないため、初期位相整合を行なえないという課
題があった。(-However, in the conventional phase comparator operation, the initial state at startup is not determined, so there is a problem that initial phase matching cannot be performed.
本発明は以上の課題を解決するもので、起動待位相比較
器に初期位相整合機能をもたせるものである。The present invention solves the above problems by providing an initial phase matching function to a startup phase comparator.
課題を解決するだめの手段
」二記目的を達成するため、本発明の技術的解決手段は
、起動時に位相比較器入力端子および状態保持端子にリ
セット信号を与えたものである。Means for Solving the Problems In order to achieve the second object, the technical solution of the present invention is to apply a reset signal to the phase comparator input terminal and the state holding terminal at startup.
作 用
本発明は、起動時に位相比較器にリセット信号を与え、
強制的に初期状態を決定し7、各分周器の出力を確定さ
せることで初期位■−1整合を行なうものである。Function The present invention provides a reset signal to the phase comparator at startup,
By forcibly determining the initial state 7 and determining the output of each frequency divider, the initial position (1)-1 matching is performed.
実施例
以下、第1[セ〕を参照しながら本発明の一実頂例につ
いて説明する。EXAMPLE Hereinafter, one embodiment of the present invention will be described with reference to the first [C].
第1図に示すタイミングのリセット信号(PS)を位相
比較器の入力ゲート10,11、状態保持ゲー1−12
.13の各ケートの人力に加える。起動代PS信号が0
”レベルとなると、10,11゜12.13の各ゲート
の出力は強制的に11111出力となる。また状態保持
ゲー)1.4.15の入力信号も”1′”1/ベルと決
まるだめ、出力はnonレベルと決定される。その結果
、PS信号が“0″レベル状態の間、φR2φV出力と
も“0″レベルと確定することになる。The reset signal (PS) with the timing shown in FIG.
.. Add to the manpower of each of the 13 Kates. Start-up PS signal is 0
When it comes to "level," the output of each gate at 10, 11° and 12.13 is forced to be 11111 output.Also, the input signal of state holding game) 1.4.15 is also determined as "1'" 1/bell. , the outputs are determined to be at the non-level.As a result, while the PS signal is in the "0" level state, both the φR2φV outputs are determined to be at the "0" level.
その後PS信号を゛1′°レベルとすることで、φR2
φV出力はFR,FVの状態により決定される通常の位
相比較器の動作となる。After that, by setting the PS signal to the level '1', φR2
The φV output operates as a normal phase comparator determined by the states of FR and FV.
Jす、上の様に、起動時に位相比較器入力端子および状
態保持端子にリセット信号ヲ与えることで初期状態を決
定し、φR1φ■出力φV定させることにより、初期位
相整合を実現できる。As above, initial phase matching can be achieved by determining the initial state by applying a reset signal to the phase comparator input terminal and state holding terminal at startup, and by determining φR1φ■output φV.
発明の効果
り、上の様に本発明は、位相比較器の入力端子および状
態保持端子にリセット信号を与えるという単純な回路構
成で、周波数シンセサイザの初期位相整合を行ない、周
波数高速引き込みを実現するものであり、低消費電力の
要求される無線機器の周波数シンセサイザ、PLL型変
調器を容易に実現し、その効果は極めて大きい。Effects of the Invention As described above, the present invention achieves high-speed frequency pull-in by performing initial phase matching of the frequency synthesizer with a simple circuit configuration of applying a reset signal to the input terminal and state holding terminal of the phase comparator. This makes it easy to realize frequency synthesizers and PLL type modulators for wireless equipment that require low power consumption, and its effects are extremely large.
第1図は本発明の一実施例における位相同期回路の要部
である位相比較器の回路図、第2図は従来の位相同期回
路の回路図、第3図は同位相同期回路の要部である位相
比較器の回路図、第4図は同位相比較器のタイミングチ
ャートである。
1・・・電圧制御発振器、2・・・高周波出力端子、3
゜6・・・分周器、4・・・位相比較器、5・・・基準
発振器、7・・・ループフィルタ、10.11・・・入
力ゲート、12.13,14.15・・・状態保持ゲー
ト。
代理人の氏名 弁理士 中 尾 敏 男 ほか1名第
図
B勤
纂3図
第
図
第
図Fig. 1 is a circuit diagram of a phase comparator which is a main part of a phase-locked circuit according to an embodiment of the present invention, Fig. 2 is a circuit diagram of a conventional phase-locked circuit, and Fig. 3 is a main part of a phase-locked circuit. FIG. 4 is a circuit diagram of the same phase comparator, and FIG. 4 is a timing chart of the same phase comparator. 1... Voltage controlled oscillator, 2... High frequency output terminal, 3
゜6... Frequency divider, 4... Phase comparator, 5... Reference oscillator, 7... Loop filter, 10.11... Input gate, 12.13, 14.15... state retention gate. Name of agent Patent attorney Toshio Nakao and one other person Figure B Work history Figure 3 Figure Figure
Claims (1)
発振器の出力を分周する第2の分周器と、前記第1、第
2の分周器の出力位相を検出する位相比較器と、前記位
相比較器の出力の高域成分を除去して前記電圧制御発振
器に帰環するループフィルタとを具備し、前記位相比較
器の入力ゲートおよび状態保持ゲートにリセット信号を
入力するように構成したことを特徴とする位相同期回路
。A first frequency divider that divides the output of the voltage controlled oscillator, a second frequency divider that divides the output of the reference oscillator, and a phase that detects the output phase of the first and second frequency dividers. It comprises a comparator and a loop filter that removes high frequency components of the output of the phase comparator and loops it back to the voltage controlled oscillator, and inputs a reset signal to the input gate and state holding gate of the phase comparator. A phase-locked circuit characterized in that it is configured as follows.
Priority Applications (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63151619A JPH024018A (en) | 1988-06-20 | 1988-06-20 | Phase locked loop circuit |
US07/369,408 US5008629A (en) | 1988-06-20 | 1989-06-20 | Frequency synthesizer |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP63151619A JPH024018A (en) | 1988-06-20 | 1988-06-20 | Phase locked loop circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPH024018A true JPH024018A (en) | 1990-01-09 |
Family
ID=15522498
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP63151619A Pending JPH024018A (en) | 1988-06-20 | 1988-06-20 | Phase locked loop circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH024018A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5761309A (en) * | 1994-08-30 | 1998-06-02 | Kokusai Denshin Denwa Co., Ltd. | Authentication system |
US10012260B2 (en) | 2013-10-16 | 2018-07-03 | Nippon Steel & Sumitomo Metal Corporation | Crankshaft for reciprocating engine |
-
1988
- 1988-06-20 JP JP63151619A patent/JPH024018A/en active Pending
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US5761309A (en) * | 1994-08-30 | 1998-06-02 | Kokusai Denshin Denwa Co., Ltd. | Authentication system |
US10012260B2 (en) | 2013-10-16 | 2018-07-03 | Nippon Steel & Sumitomo Metal Corporation | Crankshaft for reciprocating engine |
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