JPS59180542U - RF input circuit of VHF electronic tuning tuner - Google Patents

RF input circuit of VHF electronic tuning tuner

Info

Publication number
JPS59180542U
JPS59180542U JP7540483U JP7540483U JPS59180542U JP S59180542 U JPS59180542 U JP S59180542U JP 7540483 U JP7540483 U JP 7540483U JP 7540483 U JP7540483 U JP 7540483U JP S59180542 U JPS59180542 U JP S59180542U
Authority
JP
Japan
Prior art keywords
tuning
input circuit
variable capacitance
electronic tuning
capacitance diode
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
JP7540483U
Other languages
Japanese (ja)
Other versions
JPS6324673Y2 (en
Inventor
川崎　登軌雄
Original Assignee
シャープ株式会社
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 シャープ株式会社 filed Critical シャープ株式会社
Priority to JP7540483U priority Critical patent/JPS59180542U/en
Publication of JPS59180542U publication Critical patent/JPS59180542U/en
Application granted granted Critical
Publication of JPS6324673Y2 publication Critical patent/JPS6324673Y2/ja
Granted legal-status Critical Current

Links

Landscapes

  • Superheterodyne Receivers (AREA)
  • Noise Elimination (AREA)
  • Input Circuits Of Receivers And Coupling Of Receivers And Audio Equipment (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図は従来一般のＲＦ入力回路の回路図、第２図は同
人力回路の等価回路図、第３図は本考案の１実施例の回
路図、第４図は同実施例の等価回路図である。　　　　
、 ３′・・・イメージトラップ回路、４・・・同調回路、
５・・・ＲＦ増幅素子、Ｌ２〜Ｌ５・・・同調コイル、
Ｄ３・・・第１の可変容量ダイオード、Ｄ４・・・第２
の可変容量ダイオード、Ｌ７・・・コイル。Fig. 1 is a circuit diagram of a conventional general RF input circuit, Fig. 2 is an equivalent circuit diagram of the same human-powered circuit, Fig. 3 is a circuit diagram of an embodiment of the present invention, and Fig. 4 is an equivalent circuit of the same embodiment. It is a diagram.
, 3'... image trap circuit, 4... tuning circuit,
5... RF amplification element, L2 to L5... tuning coil,
D3...first variable capacitance diode, D4...second
Variable capacitance diode, L7...coil.

Claims (1)

【実用新案登録請求の範囲】[Scope of utility model registration request] 同調コイル及び第１の可変容量ダイオード等からなる同
調回路とＲＦ増幅素子の入力端子との間に第２の可変容
量ダイオードとコイルとの並列共振回路からなるイメー
ジトラップ回路を挿入し、該第２の可変容量ダイオード
に同調電圧を印加し広帯域に亘ってイメージ妨害比を改
善したことを特徴とするＶＨＦ電子同調チューナのＲＦ
入力回路。An image trap circuit consisting of a parallel resonant circuit of a second variable capacitance diode and a coil is inserted between a tuning circuit consisting of a tuning coil, a first variable capacitance diode, etc., and an input terminal of the RF amplification element, and the second An RF VHF electronic tuning tuner characterized by applying a tuning voltage to a variable capacitance diode to improve the image interference ratio over a wide band.
input circuit.
JP7540483U 1983-05-19 1983-05-19 RF input circuit of VHF electronic tuning tuner Granted JPS59180542U (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7540483U JPS59180542U (en) 1983-05-19 1983-05-19 RF input circuit of VHF electronic tuning tuner

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7540483U JPS59180542U (en) 1983-05-19 1983-05-19 RF input circuit of VHF electronic tuning tuner

Publications (2)

Publication Number Publication Date
JPS59180542U true JPS59180542U (en) 1984-12-03
JPS6324673Y2 JPS6324673Y2 (en) 1988-07-06

Family

ID=30205470

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7540483U Granted JPS59180542U (en) 1983-05-19 1983-05-19 RF input circuit of VHF electronic tuning tuner

Country Status (1)

Country Link
JP (1) JPS59180542U (en)

Also Published As

Publication number Publication date
JPS6324673Y2 (en) 1988-07-06

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