JPS6372915U - - Google Patents
Info
- Publication number
- JPS6372915U JPS6372915U JP16770086U JP16770086U JPS6372915U JP S6372915 U JPS6372915 U JP S6372915U JP 16770086 U JP16770086 U JP 16770086U JP 16770086 U JP16770086 U JP 16770086U JP S6372915 U JPS6372915 U JP S6372915U
- Authority
- JP
- Japan
- Prior art keywords
- voltage controlled
- voltage
- oscillator
- controlled oscillator
- crystal reference
- 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
- 239000013078 crystal Substances 0.000 claims description 5
- 230000010355 oscillation Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図は本考案の一実施例を示すブロツク回路
図、第２図は従来例を示すブロツク回路図である
。
１：変調回路、２：電圧制御発振器、４：位相
比較器、５：電圧制御水晶基準発振器、１０：レ
ベル切替回路、５０：負電圧発生回路。
FIG. 1 is a block circuit diagram showing one embodiment of the present invention, and FIG. 2 is a block circuit diagram showing a conventional example. 1: Modulation circuit, 2: Voltage controlled oscillator, 4: Phase comparator, 5: Voltage controlled crystal reference oscillator, 10: Level switching circuit, 50: Negative voltage generation circuit.
Claims (1)
、上記電圧制御発振器と上記電圧制御水晶基準発
振器との出力位相を比較しこの比較に基づいて電
圧制御発振器制御用の制御パルスを出力する位相
比較器とを有する変調回路と、上記電圧制御発振
器の発振周波数に応じて該電圧制御発振器への変
調入力レベルを切替えるレベル切替回路とを備え
、上記電圧制御発振器と上記電圧制御水晶基準発
振器に変調をかけることにて変調周波数による周
波数偏移の変化を小さくしたＰＬＬ周波数シンセ
サイザにおいて、 上記電圧制御水晶基準発振器の出力を整流して
負電圧を発生し、この負電圧を上記レベル切替回
路の入力範囲決定端子に出力する負電圧発生回路
を設けたことを特徴とするＰＬＬ周波数シンセサ
イザ。[Claims for Utility Model Registration] A voltage controlled oscillator, a voltage controlled crystal reference oscillator, and a control for controlling the voltage controlled oscillator based on the comparison of the output phases of the voltage controlled oscillator and the voltage controlled crystal reference oscillator. a modulation circuit having a phase comparator that outputs a pulse; and a level switching circuit that switches a modulation input level to the voltage controlled oscillator according to an oscillation frequency of the voltage controlled oscillator, the voltage controlled oscillator and the voltage controlled In a PLL frequency synthesizer that modulates a crystal reference oscillator to reduce changes in frequency deviation due to the modulation frequency, the output of the voltage-controlled crystal reference oscillator is rectified to generate a negative voltage, and this negative voltage is brought to the above level. A PLL frequency synthesizer comprising a negative voltage generating circuit that outputs to an input range determining terminal of a switching circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16770086U JPS6372915U (en) | 1986-10-31 | 1986-10-31 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16770086U JPS6372915U (en) | 1986-10-31 | 1986-10-31 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6372915U true JPS6372915U (en) | 1988-05-16 |
Family
ID=31099874
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16770086U Pending JPS6372915U (en) | 1986-10-31 | 1986-10-31 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6372915U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08195629A (en) * | 1995-01-17 | 1996-07-30 | Nec Corp | Modulation device |
-
1986
- 1986-10-31 JP JP16770086U patent/JPS6372915U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH08195629A (en) * | 1995-01-17 | 1996-07-30 | Nec Corp | Modulation device |
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