JPS5883841U - FM transmit frequency synthesis circuit - Google Patents
FM transmit frequency synthesis circuitInfo
- Publication number
- JPS5883841U JPS5883841U JP18018681U JP18018681U JPS5883841U JP S5883841 U JPS5883841 U JP S5883841U JP 18018681 U JP18018681 U JP 18018681U JP 18018681 U JP18018681 U JP 18018681U JP S5883841 U JPS5883841 U JP S5883841U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- circuit
- output
- synthesis circuit
- frequency synthesis
- 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
- Transmitters (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図は従来の回路を示すブロック図、第２図はこの発
明の一実施例を示すブロック図である。
１−１．１２・・・・・・水晶発振回路、２−１． ２
−２．１２−１．１２−２・・・・・・チャンネル切換
スイッチ、３．５・・・・・・周波数逓倍回路、４・・
・・・・水晶制御ＦＭ変調回路、６・・・・・・周波数
混合回路、１０・・・・・・電圧制御ＢＰＦ、 １１−
１． １１２・・・・・・電圧設定回路。なお、図中同
一符号は同−又ぼ相当部分を示す。FIG. 1 is a block diagram showing a conventional circuit, and FIG. 2 is a block diagram showing an embodiment of the present invention. 1-1.12...Crystal oscillation circuit, 2-1. 2
-2.12-1.12-2...Channel selection switch, 3.5...Frequency multiplier circuit, 4...
... Crystal control FM modulation circuit, 6 ... Frequency mixing circuit, 10 ... Voltage control BPF, 11-
1. 112... Voltage setting circuit. Note that the same reference numerals in the drawings indicate the same or roughly equivalent parts.
Claims (1)
しこれを適宜周波数逓倍して出力するＦＭ周波数発生回
路と、複数種類の水晶発振周波数のうちから１つの周波
数を選んで出力するチャンネル切換スイッチと、このチ
ャンネル切換スイッチの出力の周波数を逓倍する周波数
逓倍回路と、この周波数逓倍回路の出力及び上記ＦＭ周
波数発生回路の出力を入力する周波数混合回路と、この
周波数混合回路の出力を入力する電圧制御バンドパスフ
ィルタと、上記チャンネル切換スイッチの切換に連動し
て上記電圧制御バンドパスフィルタの通過周波数を切換
える手段とを備えたＦＭ送信周波数合成回路。An FM frequency generation circuit that modulates the frequency of crystal oscillation according to the signal to be transmitted, multiplies the frequency as appropriate, and outputs it, and a channel selection switch that selects and outputs one frequency from among a plurality of types of crystal oscillation frequencies; A frequency multiplier circuit that multiplies the frequency of the output of this channel selection switch, a frequency mixing circuit that inputs the output of this frequency multiplier circuit and the output of the FM frequency generation circuit, and a voltage control band that inputs the output of this frequency mixing circuit. An FM transmission frequency synthesis circuit comprising: a pass filter; and means for switching the pass frequency of the voltage-controlled band-pass filter in conjunction with switching of the channel changeover switch.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18018681U JPS5883841U (en) | 1981-12-01 | 1981-12-01 | FM transmit frequency synthesis circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP18018681U JPS5883841U (en) | 1981-12-01 | 1981-12-01 | FM transmit frequency synthesis circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5883841U true JPS5883841U (en) | 1983-06-07 |
Family
ID=29976552
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP18018681U Pending JPS5883841U (en) | 1981-12-01 | 1981-12-01 | FM transmit frequency synthesis circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5883841U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0342912A (en) * | 1989-07-10 | 1991-02-25 | Matsushita Electric Ind Co Ltd | Rwm system digital/analog converter |
-
1981
- 1981-12-01 JP JP18018681U patent/JPS5883841U/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0342912A (en) * | 1989-07-10 | 1991-02-25 | Matsushita Electric Ind Co Ltd | Rwm system digital/analog converter |
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