JPH0434028U - - Google Patents
Info
- Publication number
- JPH0434028U JPH0434028U JP7519290U JP7519290U JPH0434028U JP H0434028 U JPH0434028 U JP H0434028U JP 7519290 U JP7519290 U JP 7519290U JP 7519290 U JP7519290 U JP 7519290U JP H0434028 U JPH0434028 U JP H0434028U
- Authority
- JP
- Japan
- Prior art keywords
- controlled oscillator
- output
- voltage controlled
- frequency
- oscillator
- 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
- 230000010355 oscillation Effects 0.000 claims 3
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図及び第２図はこの考案に係るフエーズロ
ツクドループ回路の実施例を示し、第１図は構成
ブロツク図、第２図は一実施例の詳細構成ブロツ
ク図である。第３図は従来例の詳細構成ブロツク
図である。
主な符号の説明、１……電圧制御発振器、２…
…フイルタ、３……分周器、４……位相比較器、
５……基準周波数発振器、６……ローパスフイル
タ。
1 and 2 show an embodiment of a phase-locked loop circuit according to this invention, with FIG. 1 being a block diagram of the structure, and FIG. 2 being a block diagram of the detailed structure of one embodiment. FIG. 3 is a detailed block diagram of a conventional example. Explanation of main symbols, 1... Voltage controlled oscillator, 2...
... Filter, 3 ... Frequency divider, 4 ... Phase comparator,
5...Reference frequency oscillator, 6...Low pass filter.
Claims (1)
出力を分周する分周器と、基準周波数発振器と、
分周器からの分周出力と基準周波数発振器からの
発振出力とを位相比較する位相比較器と、位相比
較器からの出力が入力されるローパスフイルタと
を備え、ローパスフイルタの出力を電圧制御発振
器の発振周波数制御電圧として印加するフエーズ
ロツクドループＰＬＬ回路において、 前記電圧制御発振器と分周器との間に電圧制御
発振器出力の1/2以下の周波数を阻止するフイル
タを設け、分周器からの低周波雑音を電圧制御発
振器に混入させないように構成したことを特徴と
するフエーズロツクドループ回路。[Claims for Utility Model Registration] A voltage controlled oscillator, a frequency divider that divides the oscillation output from the voltage controlled oscillator, a reference frequency oscillator,
It is equipped with a phase comparator that compares the phases of the divided output from the frequency divider and the oscillation output from the reference frequency oscillator, and a low-pass filter to which the output from the phase comparator is input, and the output of the low-pass filter is used as a voltage-controlled oscillator. In a phase-locked loop PLL circuit that is applied as an oscillation frequency control voltage, a filter is provided between the voltage controlled oscillator and the frequency divider to block a frequency of 1/2 or less of the output of the voltage controlled oscillator, and a filter is provided between the voltage controlled oscillator and the frequency divider, and A phase-locked loop circuit characterized in that it is configured to prevent low frequency noise from being mixed into a voltage controlled oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7519290U JPH0434028U (en) | 1990-07-17 | 1990-07-17 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7519290U JPH0434028U (en) | 1990-07-17 | 1990-07-17 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0434028U true JPH0434028U (en) | 1992-03-19 |
Family
ID=31615555
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7519290U Pending JPH0434028U (en) | 1990-07-17 | 1990-07-17 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0434028U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63287213A (en) * | 1987-05-20 | 1988-11-24 | Matsushita Electric Ind Co Ltd | Phase locked oscillator |
| JPS6437120A (en) * | 1987-07-31 | 1989-02-07 | Matsushita Electric Industrial Co Ltd | Phase locked loop oscillator |
-
1990
- 1990-07-17 JP JP7519290U patent/JPH0434028U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63287213A (en) * | 1987-05-20 | 1988-11-24 | Matsushita Electric Ind Co Ltd | Phase locked oscillator |
| JPS6437120A (en) * | 1987-07-31 | 1989-02-07 | Matsushita Electric Industrial Co Ltd | Phase locked loop oscillator |
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