JPH01126628U - - Google Patents

Info

Publication number
JPH01126628U
JPH01126628U JP1988016910U JP1691088U JPH01126628U JP H01126628 U JPH01126628 U JP H01126628U JP 1988016910 U JP1988016910 U JP 1988016910U JP 1691088 U JP1691088 U JP 1691088U JP H01126628 U JPH01126628 U JP H01126628U
Authority
JP
Japan
Prior art keywords
variable capacitance
automatic fine
tuning control
diode
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
JP1988016910U
Other languages
English (en)
Other versions
JPH0644185Y2 (ja
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 filed Critical
Priority to JP1988016910U priority Critical patent/JPH0644185Y2/ja
Priority to KR2019880016654U priority patent/KR910001650Y1/ko
Priority to GB8903026A priority patent/GB2215929B/en
Publication of JPH01126628U publication Critical patent/JPH01126628U/ja
Application granted granted Critical
Publication of JPH0644185Y2 publication Critical patent/JPH0644185Y2/ja
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • 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
    • H03—ELECTRONIC CIRCUITRY
    • H03J—TUNING RESONANT CIRCUITS; SELECTING RESONANT CIRCUITS
    • H03J7/00—Automatic frequency control; Automatic scanning over a band of frequencies
    • H03J7/02—Automatic frequency control
    • H03J7/04—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant
    • H03J7/08—Automatic frequency control where the frequency control is accomplished by varying the electrical characteristics of a non-mechanically adjustable element or where the nature of the frequency controlling element is not significant using varactors, i.e. voltage variable reactive diodes

Landscapes

  • Channel Selection Circuits, Automatic Tuning Circuits (AREA)
  • Television Receiver Circuits (AREA)

Description

【図面の簡単な説明】
第１図はこの考案の一実施例の構成を示す回路
図、第２図は同実施例の等価回路図、第３図は従
来の局部発振回路の構成を示す回路図、第４図は
同局部発振回路の等価回路図、第５図は従来の局
部発振回路におけるＡＦＴ回路の特性を示す図、
第６図、第７図は各々第１図に示す実施例におけ
るＡＦＴ回路の特性を従来の特性と比較して示し
た図である。 ６，２１……自動微同調制御用可変容量ダイオ
ード、１２，１７……選局用可変容量ダイオード
、２３……抵抗、２４……ダイオード、４４，４
９……ダイオード、Ｖａ……ＡＦＴ電圧（自動微
同調制御電圧）、Ｖｔ……同調電圧（選局制御電
圧）、Ｖ１，Ｖ２……直流バイアス電圧。

Claims (1)

  1. 【実用新案登録請求の範囲】 選局用可変容量ダイオードと自動微同調制御用
    可変容量ダイオードとを具備し、選局制御電圧が
    前記選局用可変容量ダイオードに印加され、自動
    微同調制御電圧が前記自動微同調制御用可変容量
    ダイオードへ印加される電子同調チユーナにおけ
    る局部発振回路において、 前記自動微同調制御電圧を前記自動微同調制御
    用可変容量ダイオードへ印加すると共に、抵抗お
    よび順方向の第１ダイオードを介して前記選局用
    可変容量ダイオードへ印加し、 直流バイアス電圧を順方向の第２ダイオードを
    介して前記抵抗および第１ダイオードの接続点へ
    印加してなる電子同調チユーナにおける局部発振
    回路。
JP1988016910U 1988-02-10 1988-02-10 電子同調チューナにおける局部発振回路 Expired - Lifetime JPH0644185Y2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP1988016910U JPH0644185Y2 (ja) 1988-02-10 1988-02-10 電子同調チューナにおける局部発振回路
KR2019880016654U KR910001650Y1 (ko) 1988-02-10 1988-10-10 전자 동조 튜너에 있어서의 국부발진 회로
GB8903026A GB2215929B (en) 1988-02-10 1989-02-10 Electronic tuners

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1988016910U JPH0644185Y2 (ja) 1988-02-10 1988-02-10 電子同調チューナにおける局部発振回路

Publications (2)

Publication Number Publication Date
JPH01126628U true JPH01126628U (ja) 1989-08-30
JPH0644185Y2 JPH0644185Y2 (ja) 1994-11-14

Family

ID=11929295

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1988016910U Expired - Lifetime JPH0644185Y2 (ja) 1988-02-10 1988-02-10 電子同調チューナにおける局部発振回路

Country Status (3)

Country Link
JP (1) JPH0644185Y2 (ja)
KR (1) KR910001650Y1 (ja)
GB (1) GB2215929B (ja)

Families Citing this family (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH0434581Y2 (ja) * 1987-03-24 1992-08-18
DE3939742C1 (ja) * 1989-12-01 1990-12-06 Telefunken Electronic Gmbh, 7100 Heilbronn, De
DE4314424A1 (de) * 1993-05-03 1994-11-10 Philips Patentverwaltung Oszillator
GB9501243D0 (en) * 1995-01-23 1995-03-15 Rca Thomson Licensing Corp Local oscillator using digital handswitching
US5973519A (en) * 1997-01-20 1999-10-26 Nec Corporation Voltage controlled oscillator circuit capable of switching between oscillation frequency bands
GB2337382B (en) * 1998-05-16 2000-12-13 Motorola Ltd Voltage controlled oscillator
EP1867045A2 (en) * 2005-03-29 2007-12-19 Nxp B.V. Receiver having a tuning capacitance

Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57158232U (ja) * 1981-03-30 1982-10-05

Patent Citations (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS57158232U (ja) * 1981-03-30 1982-10-05

Also Published As

Publication number Publication date
GB8903026D0 (en) 1989-03-30
KR910001650Y1 (ko) 1991-03-18
JPH0644185Y2 (ja) 1994-11-14
GB2215929B (en) 1992-01-29
KR890018301U (ko) 1989-09-09
GB2215929A (en) 1989-09-27

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