JPH0288326U - - Google Patents
Info
- Publication number
- JPH0288326U JPH0288326U JP16716388U JP16716388U JPH0288326U JP H0288326 U JPH0288326 U JP H0288326U JP 16716388 U JP16716388 U JP 16716388U JP 16716388 U JP16716388 U JP 16716388U JP H0288326 U JPH0288326 U JP H0288326U
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- variable capacitance
- oscillation frequency
- predetermined variable
- capacitance element
- 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
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 239000003990 capacitor Substances 0.000 claims description 2
- 230000008878 coupling Effects 0.000 claims description 2
- 238000010168 coupling process Methods 0.000 claims description 2
- 238000005859 coupling reaction Methods 0.000 claims description 2
- 230000010355 oscillation Effects 0.000 claims 4
- 238000010586 diagram Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 1
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Channel Selection Circuits, Automatic Tuning Circuits (AREA)
Description
第１図は本考案の一実施例の回路図、第２図、
第３図は本考案の一実施例の動作を説明するため
の図、第４図、第５図は夫々本考案の他の実施例
の回路図、第６図は従来の一例の回路図、第７図
、第８図は従来の一例を説明するための図である
。
１……タンク回路、２……増幅回路、３……Ａ
ＦＣ容量、４……同調容量、５……可変手段、Ｃ
Ｂ……可変容量ダイオード、ＣＥ……結合コンデ
ンサ。
Figure 1 is a circuit diagram of an embodiment of the present invention; Figure 2 is a circuit diagram of an embodiment of the present invention;
FIG. 3 is a diagram for explaining the operation of one embodiment of the present invention, FIGS. 4 and 5 are circuit diagrams of other embodiments of the present invention, and FIG. 6 is a circuit diagram of a conventional example. FIGS. 7 and 8 are diagrams for explaining an example of the conventional technology. 1...Tank circuit, 2...Amplification circuit, 3...A
FC capacity, 4... Tuning capacity, 5... Variable means, C
B...variable capacitance diode, CE...coupling capacitor.
Claims (1)
成する複数の可変容量素子のうち所定の可変容量
素子の容量を、出力発振周波数のずれを検出して
得た信号で可変することにより該出力発振周波数
を一定に保持する発振回路において、 前記増幅回路を構成する増幅用トランジスタの
エミツタと前記所定の可変容量素子とを結合コン
デンサを介して結合してなる発振回路。[Claim for Utility Model Registration] The capacitance of a predetermined variable capacitance element among a plurality of variable capacitance elements constituting a resonant circuit provided in the positive feedback path of an amplifier circuit is obtained by detecting a shift in the output oscillation frequency. An oscillation circuit that maintains the output oscillation frequency constant by varying it with a signal, the oscillation circuit comprising an emitter of an amplification transistor constituting the amplification circuit and the predetermined variable capacitance element coupled via a coupling capacitor. .
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16716388U JPH0288326U (en) | 1988-12-24 | 1988-12-24 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP16716388U JPH0288326U (en) | 1988-12-24 | 1988-12-24 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0288326U true JPH0288326U (en) | 1990-07-12 |
Family
ID=31455211
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP16716388U Pending JPH0288326U (en) | 1988-12-24 | 1988-12-24 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0288326U (en) |
-
1988
- 1988-12-24 JP JP16716388U patent/JPH0288326U/ja active Pending
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