JPS5929812U - FM modulation circuit - Google Patents
FM modulation circuitInfo
- Publication number
- JPS5929812U JPS5929812U JP12400982U JP12400982U JPS5929812U JP S5929812 U JPS5929812 U JP S5929812U JP 12400982 U JP12400982 U JP 12400982U JP 12400982 U JP12400982 U JP 12400982U JP S5929812 U JPS5929812 U JP S5929812U
- Authority
- JP
- Japan
- Prior art keywords
- phase
- locked loop
- modulation circuit
- loop circuit
- frequency
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (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
第１図はフェーズロックループ回路の原理を説明するた
めのブロック図、第２図は従来のＦＭ変調回路の構成を
示したブロック図、第３図は本考案によるＦＭ変調回路
の一実施例の構成を示したブロック図である。
記号の説明：１は電圧制御発振器、２は基準発振器、３
は分周器、４は位相検波器、５はループフィルタ、６は
変調信号用増幅器、７はループフィルタ５よりカットオ
フ周波数の低いループフィルタ、８． ９． １０はス
イッチ回路、１１．１２は分周器をそれぞれあられして
いる。Fig. 1 is a block diagram for explaining the principle of a phase-locked loop circuit, Fig. 2 is a block diagram showing the configuration of a conventional FM modulation circuit, and Fig. 3 is an embodiment of an FM modulation circuit according to the present invention. FIG. 2 is a block diagram showing the configuration. Explanation of symbols: 1 is voltage controlled oscillator, 2 is reference oscillator, 3
4 is a frequency divider, 4 is a phase detector, 5 is a loop filter, 6 is a modulation signal amplifier, 7 is a loop filter with a lower cutoff frequency than the loop filter 5, 8. 9. 10 is a switch circuit, and 11 and 12 are frequency dividers.
Claims (1)
するフェーズロックループ回路で構成されたＦＭ変調回
路において、前記フェーズロックループ回路が定常状態
になった時点で、該フェーズロックループ回路の位相検
波器に入力する前記基準発振器側及び前記電圧制御発振
器側の信号を同じ分周数だけ分周し、かつ該フェーズロ
ックループ回路のループフィルタのカットオフ周波数を
下げる手段を有するＦＭ変調回路。In an FM modulation circuit configured with a phase-locked loop circuit that uses a voltage-controlled oscillator and controls the frequency by a reference oscillator, when the phase-locked loop circuit reaches a steady state, the phase detector of the phase-locked loop circuit An FM modulation circuit comprising means for frequency-dividing input signals from the reference oscillator side and the voltage-controlled oscillator side by the same frequency division number, and lowering the cutoff frequency of a loop filter of the phase-locked loop circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12400982U JPS5929812U (en) | 1982-08-18 | 1982-08-18 | FM modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12400982U JPS5929812U (en) | 1982-08-18 | 1982-08-18 | FM modulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5929812U true JPS5929812U (en) | 1984-02-24 |
Family
ID=30282850
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12400982U Pending JPS5929812U (en) | 1982-08-18 | 1982-08-18 | FM modulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5929812U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989674U (en) * | 1982-12-10 | 1984-06-18 | 株式会社電元社製作所 | Aluminum alloy welding gun |
| JPS6052079U (en) * | 1983-09-14 | 1985-04-12 | 株式会社 三島工作所 | Spot welder welding gun |
| JPS6286982U (en) * | 1985-11-22 | 1987-06-03 | ||
| JPH0391191U (en) * | 1990-11-22 | 1991-09-17 |
-
1982
- 1982-08-18 JP JP12400982U patent/JPS5929812U/en active Pending
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5989674U (en) * | 1982-12-10 | 1984-06-18 | 株式会社電元社製作所 | Aluminum alloy welding gun |
| JPH0357342Y2 (en) * | 1982-12-10 | 1991-12-26 | ||
| JPS6052079U (en) * | 1983-09-14 | 1985-04-12 | 株式会社 三島工作所 | Spot welder welding gun |
| JPS6286982U (en) * | 1985-11-22 | 1987-06-03 | ||
| JPH0391191U (en) * | 1990-11-22 | 1991-09-17 |
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