JPH0419023U - - Google Patents
Info
- Publication number
- JPH0419023U JPH0419023U JP5935290U JP5935290U JPH0419023U JP H0419023 U JPH0419023 U JP H0419023U JP 5935290 U JP5935290 U JP 5935290U JP 5935290 U JP5935290 U JP 5935290U JP H0419023 U JPH0419023 U JP H0419023U
- Authority
- JP
- Japan
- Prior art keywords
- capacitor
- switching element
- oscillation
- circuit
- parallel
- 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
- 239000003990 capacitor Substances 0.000 claims description 9
- 230000010355 oscillation Effects 0.000 claims description 9
- 238000010586 diagram Methods 0.000 description 4
Description
第１図は本考案の発振回路用電子同調回路の第
１実施例による回路構成図、第２図ａ，ｂはそれ
ぞれ同回路をバンド切換したときの一次側の回路
図、第３図は第２実施例による回路構成図、第４
図は本考案および従来の発振回路を用いたスーパ
ーヘテロダイン方式の受信機の一部を示すブロツ
ク図、第５図は従来の発振回路用電子同調回路を
示す回路構成図である。
３……出力端、Ｌ……発振コイル、ＴＣ……ト
リマーコンデンサ、Ｃ１……コンデンサ、Ｃ２…
…補助コンデンサ、ＰＣ１，ＰＣ２……パツテイ
ング・コンデンサ、ＶＣ……可変容量ダイオード
、Ｄ１，Ｄ２，Ｄ３，Ｄ４……スイツチング用ダ
イオード、Ｑ１，Ｑ２……スイツチング用トラン
ジスタ。
FIG. 1 is a circuit diagram of the first embodiment of the electronic tuning circuit for an oscillation circuit of the present invention, FIGS. Circuit configuration diagram according to the second embodiment, 4th
The figure is a block diagram showing part of a superheterodyne type receiver using the oscillation circuit of the present invention and the conventional one, and FIG. 5 is a circuit diagram showing a conventional electronic tuning circuit for the oscillation circuit. 3... Output end, L... Oscillation coil, TC... Trimmer capacitor, C1... Capacitor, C2...
...Auxiliary capacitor, PC1, PC2...Putting capacitor, VC...Variable capacitance diode, D1, D2, D3, D4...Switching diode, Q1, Q2...Switching transistor.
Claims (1)
ための発振出力を得る発振回路用電子同調回路に
おいて、 一次側および二次側コイルからなる１つの発振
コイルを用い、該一次側コイルと並列に第１のコ
ンデンサと可変容量ダイオードと抵抗の直列路を
接続し、前記抵抗に並列に第２のコンデンサおよ
び第３のコンデンサと第１のスイツチング素子の
直列路をそれぞれ接続し、同じく一次側コイルと
並列に第４のコンデンサと第２のスイツチング素
子の直列路を接続し、前記第１のコンデンサと可
変容量ダイオードの接続点に同調電圧を入力する
とともに、前記各スイツチング素子に、所望の周
波数バンドに応じたバンド切換制御電圧を作用さ
せて該スイツチング素子の導通・不導通を制御し
、同調発振周波数を切換えるようにしたことを特
徴とする発振回路用電子同調回路。[Claims for Utility Model Registration] In an electronic tuning circuit for an oscillation circuit that obtains an oscillation output for tuning to a predetermined frequency band from received waves, one oscillation coil consisting of a primary side coil and a secondary side coil is used, A series path of a first capacitor, a variable capacitance diode, and a resistor is connected in parallel with the primary coil, and a series path of a second capacitor, a third capacitor, and a first switching element is connected in parallel with the resistor. Similarly, a series circuit of a fourth capacitor and a second switching element is connected in parallel with the primary coil, and a tuning voltage is input to the connection point between the first capacitor and the variable capacitance diode, and the switching element An electronic tuning circuit for an oscillation circuit, characterized in that a band switching control voltage corresponding to a desired frequency band is applied to the switching element to control conduction/non-conduction of the switching element, thereby switching the tuned oscillation frequency.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5935290U JPH0419023U (en) | 1990-06-04 | 1990-06-04 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP5935290U JPH0419023U (en) | 1990-06-04 | 1990-06-04 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0419023U true JPH0419023U (en) | 1992-02-18 |
Family
ID=31585776
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP5935290U Pending JPH0419023U (en) | 1990-06-04 | 1990-06-04 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0419023U (en) |
Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01240009A (en) * | 1988-03-22 | 1989-09-25 | Alps Electric Co Ltd | Multiple band tuning circuit |
-
1990
- 1990-06-04 JP JP5935290U patent/JPH0419023U/ja active Pending
Patent Citations (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH01240009A (en) * | 1988-03-22 | 1989-09-25 | Alps Electric Co Ltd | Multiple band tuning circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| JPH0419023U (en) | ||
| JPH01126628U (en) | ||
| JPH0328816U (en) | ||
| JPS5931042Y2 (en) | All channel channel | |
| JPH0415329U (en) | ||
| JPH0290532U (en) | ||
| JPS6140020U (en) | Voltage controlled oscillator circuit | |
| JPS61162148U (en) | ||
| JPS6040725B2 (en) | oscillation device | |
| JPS62198730U (en) | ||
| JPH01117133U (en) | ||
| JPS6217287U (en) | ||
| JPS6344509U (en) | ||
| JPS61151422U (en) | ||
| JPS61111241U (en) | ||
| JPH0177046U (en) | ||
| JPS6423111U (en) | ||
| JPS61140624U (en) | ||
| JPH02100341U (en) | ||
| JPS62183434U (en) | ||
| JPS62203517U (en) | ||
| JPS637817U (en) | ||
| JPS62129844U (en) | ||
| JPS63178971U (en) | ||
| JPH0257627U (en) |