JPH0247843U - - Google Patents
Info
- Publication number
- JPH0247843U JPH0247843U JP1988126776U JP12677688U JPH0247843U JP H0247843 U JPH0247843 U JP H0247843U JP 1988126776 U JP1988126776 U JP 1988126776U JP 12677688 U JP12677688 U JP 12677688U JP H0247843 U JPH0247843 U JP H0247843U
- Authority
- JP
- Japan
- Prior art keywords
- local oscillation
- output
- vhf
- circuit
- uhf
- 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
- 230000010355 oscillation Effects 0.000 claims description 22
- 230000008878 coupling Effects 0.000 claims description 4
- 238000010168 coupling process Methods 0.000 claims description 4
- 238000005859 coupling reaction Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 claims description 2
- 239000000284 extract Substances 0.000 claims 1
- 230000001939 inductive effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Superheterodyne Receivers (AREA)
Description
第１図は本考案に係るチユーナの電圧制御発振
回路の一実施例を示す回路図、第２図は従来のチ
ユーナの電圧制御発振回路を示す回路図である。
１……ＶＨＦ局部発振回路、２……ＵＨＦ局部
発振回路、３……同調電圧入力端子、４……アー
スパターン、５……バンド切替用電圧入力端子、
６……出力端子、Ｌ１……ＶＨＦ局部発振コイル
、Ｌ３……ＵＨＦ局部発振インダクタ、Ｃ１４…
…結合コンデンサ、Ｄ１，Ｄ３……バラクタダイ
オード。
FIG. 1 is a circuit diagram showing an embodiment of a voltage controlled oscillation circuit for a tuner according to the present invention, and FIG. 2 is a circuit diagram showing a conventional voltage controlled oscillation circuit for a tuner. 1... VHF local oscillation circuit, 2... UHF local oscillation circuit, 3... Tuning voltage input terminal, 4... Earth pattern, 5... Band switching voltage input terminal,
6...Output terminal, L1...VHF local oscillation coil, L3...UHF local oscillation inductor, C14...
...Coupling capacitor, D1, D3... Varactor diode.
Claims (1)
るＶＨＦ局部発振回路及びＵＨＦ帯受信用のＵＨ
Ｆ局部発振出力を出力するＵＨＦ局部発振回路と
、前記ＶＨＦ局部発振出力又は前記ＵＨＦ局部発
振出力を導出する出力端子とを具備したチユーナ
の電圧制御発振回路において、 前記ＶＨＦ局部発振回路のアースパターンと前
記出力端子との間に接続して前記ＶＨＦ局部発振
出力を取り出す抵抗素子と、 前記出力端子と基準電位点との間に接続される
結合コンデンサ及び結合インダクタの直列共振回
路により構成されて前記抵抗素子と共に出力回路
を成し、前記ＵＨＦ局部発振回路からのＵＨＦ局
部発振出力を誘導結合により取り出すと共に、前
記ＶＨＦ局部発振出力の高調波に対して低インピ
ーダンスに設定されて前記ＶＨＦ局部発振出力の
高周波を減衰させる回路手段とを具備したことを
特徴とするチユーナの電圧制御発振回路。[Claims for Utility Model Registration] VHF local oscillation circuit that outputs VHF local oscillation output for VHF band reception and UH for UHF band reception
A voltage controlled oscillation circuit for a tuner comprising a UHF local oscillation circuit that outputs an F local oscillation output, and an output terminal that derives the VHF local oscillation output or the UHF local oscillation output, the earth pattern of the VHF local oscillation circuit and A resistive element connected between the output terminal and the VHF local oscillation output, and a series resonant circuit of a coupling capacitor and a coupling inductor connected between the output terminal and a reference potential point. The device forms an output circuit together with the UHF local oscillation circuit, and extracts the UHF local oscillation output from the UHF local oscillation circuit by inductive coupling, and is set to have a low impedance with respect to harmonics of the VHF local oscillation output, and outputs the high frequency of the VHF local oscillation output. A voltage controlled oscillation circuit for a tuner, comprising circuit means for attenuating the oscillation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988126776U JPH0247843U (en) | 1988-09-28 | 1988-09-28 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1988126776U JPH0247843U (en) | 1988-09-28 | 1988-09-28 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0247843U true JPH0247843U (en) | 1990-04-03 |
Family
ID=31378600
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1988126776U Pending JPH0247843U (en) | 1988-09-28 | 1988-09-28 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0247843U (en) |
-
1988
- 1988-09-28 JP JP1988126776U patent/JPH0247843U/ja active Pending
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