JPS6030647U - frequency modulation circuit - Google Patents
frequency modulation circuitInfo
- Publication number
- JPS6030647U JPS6030647U JP11987683U JP11987683U JPS6030647U JP S6030647 U JPS6030647 U JP S6030647U JP 11987683 U JP11987683 U JP 11987683U JP 11987683 U JP11987683 U JP 11987683U JP S6030647 U JPS6030647 U JP S6030647U
- Authority
- JP
- Japan
- Prior art keywords
- transmission
- controlled oscillator
- resonant circuit
- voltage controlled
- signal during
- 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.)
- Granted
Links
Landscapes
- Transceivers (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図は従来の周波数変調回路、第２図は本考案の実施
例の周波数変調回路を示すものである。
Ｑｌは発振用のトランジスタ、Ｑ２は変調用のトランジ
スタ、Ｌｌは同調ライン、Ｌ２は結合ライン、Ｌ３はチ
ョークコイル、Ｒ１−Ｒ１１は抵抗、０１〜ＣＩＯはコ
ンデンサ、Ｄｌはダイオード、Ｄ２は可変容量ダイオー
ド、ＳＷは切換スイッチ、Ｔ１は発振出力端子、Ｔ２は
制御電圧入力端子、Ｔ３は変調入力端子である。FIG. 1 shows a conventional frequency modulation circuit, and FIG. 2 shows a frequency modulation circuit according to an embodiment of the present invention. Ql is an oscillation transistor, Q2 is a modulation transistor, Ll is a tuning line, L2 is a coupling line, L3 is a choke coil, R1-R11 are resistors, 01 to CIO are capacitors, Dl is a diode, and D2 is a variable capacitance diode. , SW is a changeover switch, T1 is an oscillation output terminal, T2 is a control voltage input terminal, and T3 is a modulation input terminal.
Claims (1)
により、送信時は搬送波周波数信号を出力し、受信時は
局部発振周波数信号を出力する周波数切換手段を設け、
前記電圧制御発振器の発振−用トランジスタと前記共振
回路との接続点に、送信時に前記搬送波周波数信号を変
調する変調入力信号を増幅する緩衝増幅器の出力端子を
接続し、該緩衝増幅器のバイアス回路に前記周波数切換
手段と連動して送信時にバイアス電圧を供給し、受信時
にバイアス電圧の供給を停止する手段とを設けたことを
特徴とする周波数変調回路。A frequency switching means is provided in the resonant circuit of the voltage controlled oscillator to output a carrier frequency signal during transmission and a local oscillation frequency signal during reception according to a switching signal between transmission and reception,
An output terminal of a buffer amplifier for amplifying a modulation input signal that modulates the carrier frequency signal during transmission is connected to a connection point between the oscillation transistor of the voltage controlled oscillator and the resonant circuit, and a bias circuit of the buffer amplifier is connected to the connection point between the oscillation transistor of the voltage controlled oscillator and the resonant circuit. A frequency modulation circuit comprising means for supplying a bias voltage at the time of transmission and stopping supply of the bias voltage at the time of reception in conjunction with the frequency switching means.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11987683U JPS6030647U (en) | 1983-08-02 | 1983-08-02 | frequency modulation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11987683U JPS6030647U (en) | 1983-08-02 | 1983-08-02 | frequency modulation circuit |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6030647U true JPS6030647U (en) | 1985-03-01 |
| JPS6347093Y2 JPS6347093Y2 (en) | 1988-12-06 |
Family
ID=30274944
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11987683U Granted JPS6030647U (en) | 1983-08-02 | 1983-08-02 | frequency modulation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6030647U (en) |
-
1983
- 1983-08-02 JP JP11987683U patent/JPS6030647U/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6347093Y2 (en) | 1988-12-06 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPS6030647U (en) | frequency modulation circuit | |
| JPS59171439U (en) | VHF tuner | |
| JPS58172238U (en) | Receiving machine | |
| JPS6126313U (en) | high frequency oscillator | |
| JPS59164320U (en) | FM modulation circuit | |
| JPS6118614U (en) | voltage controlled oscillation circuit | |
| JPS58194515U (en) | oscillation circuit | |
| JPS6140020U (en) | Voltage controlled oscillator circuit | |
| JPS60181940U (en) | AM/FM stereo receiver | |
| JPS60129758U (en) | oscillator | |
| JPS58141643U (en) | AM radio receiver | |
| JPS5956820U (en) | amplifier | |
| JPS6059654U (en) | Receiving machine | |
| JPS6082858U (en) | FSK modulator | |
| JPS5850537U (en) | local oscillation circuit | |
| JPS59154965U (en) | RF modulator | |
| JPS5883812U (en) | modulation circuit | |
| JPS59189313U (en) | variable frequency oscillation circuit | |
| JPS58189666U (en) | Input device for CATV tuner | |
| JPS58149806U (en) | Audio intermediate frequency conversion circuit | |
| JPS60174373U (en) | Television signal receiving circuit | |
| JPS593644U (en) | Oscillation circuit in receiver | |
| JPS6066147U (en) | A.M. fm stereo receiver | |
| JPS6047308U (en) | amplitude modulator | |
| JPS60116748U (en) | UHF-VHF receiver |