JPS596331U - CATV tuner - Google Patents

CATV tuner

Info

Publication number
JPS596331U
JPS596331U JP1982099680U JP9968082U JPS596331U JP S596331 U JPS596331 U JP S596331U JP 1982099680 U JP1982099680 U JP 1982099680U JP 9968082 U JP9968082 U JP 9968082U JP S596331 U JPS596331 U JP S596331U
Authority
JP
Japan
Prior art keywords
voltage
band
switching diode
terminal
switching
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
Application number
JP1982099680U
Other languages
Japanese (ja)
Other versions
JPH0117874Y2 (en
Inventor
西村　武志
Original Assignee
日本電気ホームエレクトロニクス株式会社
Priority date (The priority date 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 date listed.)
Filing date
Publication date
Application filed by 日本電気ホームエレクトロニクス株式会社 filed Critical 日本電気ホームエレクトロニクス株式会社
Priority to JP1982099680U priority Critical patent/JPS596331U/en
Priority to KR2019830007288U priority patent/KR900011294Y1/en
Publication of JPS596331U publication Critical patent/JPS596331U/en
Application granted granted Critical
Publication of JPH0117874Y2 publication Critical patent/JPH0117874Y2/ja
Granted legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J5/00—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner
    • H03J5/24—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection
    • H03J5/242—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection
    • H03J5/244—Discontinuous tuning; Selecting predetermined frequencies; Selecting frequency bands with or without continuous tuning in one or more of the bands, e.g. push-button tuning, turret tuner with a number of separate pretuned tuning circuits or separate tuning elements selectively brought into circuit, e.g. for waveband selection or for television channel selection used exclusively for band selection using electronic means
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J3/00—Continuous tuning
    • H03J3/02—Details
    • H03J3/16—Tuning without displacement of reactive element, e.g. by varying permeability
    • H03J3/18—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance
    • H03J3/185—Tuning without displacement of reactive element, e.g. by varying permeability by discharge tube or semiconductor device simulating variable reactance with varactors, i.e. voltage variable reactive diodes
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N5/00—Details of television systems
    • H04N5/44—Receiver circuitry for the reception of television signals according to analogue transmission standards
    • H04N5/50—Tuning indicators; Automatic tuning control
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04N—PICTORIAL COMMUNICATION, e.g. TELEVISION
    • H04N7/00—Television systems
    • H04N7/20—Adaptations for transmission via a GHz frequency band, e.g. via satellite

Landscapes

  • Engineering & Computer Science (AREA)
  • Multimedia (AREA)
  • Signal Processing (AREA)
  • Physics & Mathematics (AREA)
  • Astronomy & Astrophysics (AREA)
  • General Physics & Mathematics (AREA)
  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Circuits Of Receivers In General (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (AREA)
  • Electronic Switches (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

【図面の簡単な説明】[Brief explanation of drawings]

第１図及び第２図は従来のチューナ回路を示すブロック
概略図、第３図は本考案のチューナのブロック図、第４
図は第３図の要部回路図、第５図　　′は第４図の局部
発振段の要部回路図、及び第６図は第４図のＲＦ通幅段
の要部回路図である。 １２・・・シングルバンドチューナ部、１３・・・２バ
ンドチユ一ナ部、１４・・・信号選択器、１６・・・電
源回路、２０・・・ダイオード、２１・・・第１電源端
子、２２・・・第２電源端子、２３・・・第３電源端子
、２４゜２５．２７，３７，５３・・・スイッチングダ
イオード、２６．２８．２９・・・逆流防止用ダイオー
ド、３０・・・局部発振段、３１・・・発振用能動素子
（１〜ランジスタ）、４０・・・ＲＦ増幅段、４１・・
・増幅素子（ＦＥＴ）、４２・・・バイアス回路。1 and 2 are block diagrams showing conventional tuner circuits, FIG. 3 is a block diagram of the tuner of the present invention, and FIG. 4 is a block diagram showing a conventional tuner circuit.
3 is a circuit diagram of the main part of FIG. 3, FIG. 5' is a circuit diagram of the main part of the local oscillation stage of FIG. 4, and FIG. 6 is a circuit diagram of the main part of the RF transmission stage of FIG. 4. DESCRIPTION OF SYMBOLS 12... Single band tuner part, 13... Two band tuner part, 14... Signal selector, 16... Power supply circuit, 20... Diode, 21... First power supply terminal, 22 ...Second power supply terminal, 23...Third power supply terminal, 24゜25.27, 37, 53...Switching diode, 26.28.29...Reverse current prevention diode, 30...Local Oscillation stage, 31... Active element for oscillation (1 to transistor), 40... RF amplification stage, 41...
- Amplification element (FET), 42...bias circuit.

Claims (3)

【実用新案登録請求の範囲】[Scope of utility model registration request] （１）ＶＨＦ入力端子からの入力信号を第１及び第２バ
ンドと第３バンドに分離する信号選択器１、分離された
第１及び第２バンドから所望するチャンネルを選局する
２バンドチユ一ナ部、分離された第３バンドから所望す
るチャンネルを選局するシングルバンドチューナ部、各
バンドに対応して設けた第１乃至第３電圧端子を含む動
作電源回路、及び前記２バンドチユ一ナ部と前記第１電
圧端子間に介挿されたダイオードを具備し、前記各電圧
端子からの電圧供給により所定のバンドを電圧切換ある
いは端子切換方式で選択可能にしたことを特徴とするＣ
ＡＴＶチュー−す。(1) A signal selector 1 that separates an input signal from a VHF input terminal into first and second bands and a third band, and a two-band tuner that selects a desired channel from the separated first and second bands. a single band tuner section for selecting a desired channel from the separated third band; an operating power supply circuit including first to third voltage terminals provided corresponding to each band; and the two-band tuner section. C characterized in that it comprises a diode inserted between the first voltage terminals, and a predetermined band can be selected by voltage switching or terminal switching method by voltage supply from each of the voltage terminals.
ATV tune. （２）前記２パツドチユ一ナ部がノ１イチャンネル及び
ローチャンネル用の同調コイル、この同調コイルの接続
点に直流阻止用コンデンサを介して結合したスイッチン
グダイオード、及びこのスイッチングダイオードに動作
電圧供給側電極が接続された発振用能動素子を含む局部
発振段を具備し、前記コンデンサとスイッチングダイオ
ードの接続点に前記第１電圧端子からの動作電圧を供給
するようにした実用新案登録請求あ範囲第１項に記載の
ＣＡＴＶチューナ。(2) The 2-patch unit includes a tuning coil for the 1 channel and low channel, a switching diode coupled to the connection point of this tuning coil via a DC blocking capacitor, and an operating voltage supply side to this switching diode. A utility model registration claim 1 comprising a local oscillation stage including an oscillation active element connected to an electrode, and supplying an operating voltage from the first voltage terminal to a connection point between the capacitor and the switching diode. The CATV tuner described in section. （３）前記第２バンドチューナ部がＡＧＧ制御付増幅素
子、このバイアス回路、及びスイッチングダイオードを
含む出力側複同調回路を具備し、前記スイッチングダイ
オードの動作電圧を前記第１電圧端子から逆方向バイア
ス、また、前記第２電圧端子から順方向バイアスで供給
すると共に前記増幅素子及び前記バイアス回路の動作電
圧をいずれが一方の電圧端子から供給し、第２バンドの
選択時に導通状態にして前記スイッチングダイオードの
電流を安定化した実用新案登録請求の範囲第１項に記載
のＣＡＴＶチューナ。(3) The second band tuner section includes an AGG-controlled amplifier element, this bias circuit, and an output-side double-tuned circuit including a switching diode, and reverse biases the operating voltage of the switching diode from the first voltage terminal. Further, the switching diode is supplied with a forward bias from the second voltage terminal, and the operating voltage of the amplification element and the bias circuit is supplied from one voltage terminal, and the switching diode is made conductive when the second band is selected. A CATV tuner according to claim 1, which stabilizes the current of the utility model.
JP1982099680U 1982-07-01 1982-07-01 CATV tuner Granted JPS596331U (en)

Priority Applications (2)

Application Number Priority Date Filing Date Title
JP1982099680U JPS596331U (en) 1982-07-01 1982-07-01 CATV tuner
KR2019830007288U KR900011294Y1 (en) 1982-07-01 1983-08-19 Tuner for CATV

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1982099680U JPS596331U (en) 1982-07-01 1982-07-01 CATV tuner

Publications (2)

Publication Number Publication Date
JPS596331U true JPS596331U (en) 1984-01-17
JPH0117874Y2 JPH0117874Y2 (en) 1989-05-24

Family

ID=30236127

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1982099680U Granted JPS596331U (en) 1982-07-01 1982-07-01 CATV tuner

Country Status (2)

Country Link
JP (1) JPS596331U (en)
KR (1) KR900011294Y1 (en)

Also Published As

Publication number Publication date
KR850002225U (en) 1985-04-22
KR900011294Y1 (en) 1990-12-22
JPH0117874Y2 (en) 1989-05-24

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