JPS59118309U - frequency modulation circuit - Google Patents
frequency modulation circuitInfo
- Publication number
- JPS59118309U JPS59118309U JP960983U JP960983U JPS59118309U JP S59118309 U JPS59118309 U JP S59118309U JP 960983 U JP960983 U JP 960983U JP 960983 U JP960983 U JP 960983U JP S59118309 U JPS59118309 U JP S59118309U
- Authority
- JP
- Japan
- Prior art keywords
- variable capacitance
- circuit
- oscillation
- variable
- 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
Landscapes
- Digital Transmission Methods That Use Modulated Carrier Waves (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (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、第２図は周波数変調回路の従来例、第３図はそ
れ等のＣＶ値対変調度の傾向を示す特性図、第４図は本
考案回路の構成例、第５図はそのＣＶ値対変調度の傾向
を示す特性図である。
ＣＤ・・・可変容量ダイオード、Ｃ■・・・可変容量素
子、Ｃ，Ｃ１，Ｃ２ｅ ｃ３…コンデンサ、Ｌ・・φコ
イル。Figures 1 and 2 are conventional examples of frequency modulation circuits, Figure 3 is a characteristic diagram showing the tendency of CV value versus modulation degree, Figure 4 is an example of the configuration of the circuit of the present invention, and Figure 5 is its FIG. 3 is a characteristic diagram showing a tendency of CV value versus modulation degree. CD...variable capacitance diode, C■...variable capacitance element, C, C1, C2e c3...capacitor, L...φ coil.
Claims (1)
イオードに変調信号を加えて周波数変調波を発生する方
式において、少なくとも、変調信号を加える可変容量ダ
イオードと第１の直列容量とよりなる回路と、発振周波
数を調整する可変容量ダイオードを含む可変容量素子と
第２の直列容量とよりなる回路を、一方の回路の可変容
量ダイオードまたは可変容量素子は発振同調コイルの高
電位側に、他方の回路の可変容量ダイオードまたは可変
容量素子は発振同調コイルの低電位側に配置して発振同
調コイルと並列に接続し、かつ前記２つの可変容量と直
列容量の接合点間に第３の容量を接続し、この第３の容
量値を加減することにより発振周波数の調整に起因する
変調感度の変化を軽減した周波数変調回路。In a method of generating a frequency modulated wave by applying a modulation signal to a voltage-controlled variable capacitance diode that constitutes a part of the tuning capacitance of an oscillator, a circuit comprising at least a variable capacitance diode to which a modulation signal is applied and a first series capacitor; , a circuit consisting of a variable capacitance element including a variable capacitance diode that adjusts the oscillation frequency and a second series capacitor, the variable capacitance diode or variable capacitance element of one circuit is placed on the high potential side of the oscillation tuning coil, and the other circuit is The variable capacitance diode or variable capacitance element is placed on the low potential side of the oscillation tuning coil and connected in parallel with the oscillation tuning coil, and a third capacitance is connected between the junction of the two variable capacitances and the series capacitance. , a frequency modulation circuit in which changes in modulation sensitivity caused by adjustment of the oscillation frequency are reduced by adjusting the third capacitance value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP960983U JPS59118309U (en) | 1983-01-26 | 1983-01-26 | frequency modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP960983U JPS59118309U (en) | 1983-01-26 | 1983-01-26 | frequency modulation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS59118309U true JPS59118309U (en) | 1984-08-09 |
Family
ID=30141066
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP960983U Pending JPS59118309U (en) | 1983-01-26 | 1983-01-26 | frequency modulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS59118309U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63128806A (en) * | 1986-11-19 | 1988-06-01 | Kokusai Electric Co Ltd | Broad band voltage controlled oscillator for fm modulation |
-
1983
- 1983-01-26 JP JP960983U patent/JPS59118309U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS63128806A (en) * | 1986-11-19 | 1988-06-01 | Kokusai Electric Co Ltd | Broad band voltage controlled oscillator for fm modulation |
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