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JPS6117613Y2 - - Google Patents

Info

Publication number
JPS6117613Y2
JPS6117613Y2 JP1979109059U JP10905979U JPS6117613Y2 JP S6117613 Y2 JPS6117613 Y2 JP S6117613Y2 JP 1979109059 U JP1979109059 U JP 1979109059U JP 10905979 U JP10905979 U JP 10905979U JP S6117613 Y2 JPS6117613 Y2 JP S6117613Y2
Authority
JP
Japan
Prior art keywords
capacitor
oscillation
coil
circuit
oscillation circuit
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.)
Expired
Application number
JP1979109059U
Other languages
English (en)
Other versions
JPS5626411U (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 JP1979109059U priority Critical patent/JPS6117613Y2/ja
Priority to US06/175,953 priority patent/US4370626A/en
Priority to CA000357897A priority patent/CA1149475A/en
Publication of JPS5626411U publication Critical patent/JPS5626411U/ja
Application granted granted Critical
Publication of JPS6117613Y2 publication Critical patent/JPS6117613Y2/ja
Expired legal-status Critical Current

Links

Classifications

    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1231—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier comprising one or more bipolar transistors
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1203—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device the amplifier being a single transistor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B5/00—Generation of oscillations using amplifier with regenerative feedback from output to input
    • H03B5/08—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance
    • H03B5/12—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device
    • H03B5/1237—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator
    • H03B5/124—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance
    • H03B5/1243—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element comprising lumped inductance and capacitance active element in amplifier being semiconductor device comprising means for varying the frequency of the generator the means comprising a voltage dependent capacitance the means comprising voltage variable capacitance diodes
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2200/00—Indexing scheme relating to details of oscillators covered by H03B
    • H03B2200/003—Circuit elements of oscillators
    • H03B2200/004—Circuit elements of oscillators including a variable capacitance, e.g. a varicap, a varactor or a variable capacitance of a diode or transistor
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/02—Varying the frequency of the oscillations by electronic means
    • H03B2201/0208—Varying the frequency of the oscillations by electronic means the means being an element with a variable capacitance, e.g. capacitance diode
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03B—GENERATION OF OSCILLATIONS, DIRECTLY OR BY FREQUENCY-CHANGING, BY CIRCUITS EMPLOYING ACTIVE ELEMENTS WHICH OPERATE IN A NON-SWITCHING MANNER; GENERATION OF NOISE BY SUCH CIRCUITS
    • H03B2201/00—Aspects of oscillators relating to varying the frequency of the oscillations
    • H03B2201/03—Varying beside the frequency also another parameter of the oscillator in dependence on the frequency
    • H03B2201/031—Varying beside the frequency also another parameter of the oscillator in dependence on the frequency the parameter being the amplitude of a signal, e.g. maintaining a constant output amplitude over the frequency range

Landscapes

  • Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
  • Superheterodyne Receivers (AREA)

Description

【考案の詳細な説明】 本考案はチユーナの局部発振回路に関し、その
目的とするところは、広帯域に均一なレベルの出
力信号が取り出せる局部発振回路を提供するにあ
る。
従来の可変周波数型の局部発振回路を第１図に
示す。第１図において、１，２，３はバイアス用
の抵抗、４，５は接地用のコンデンサ、７は帰還
用コンデンサ、８は共振用のコンデンサ、６は発
振用トランジスタ、９，１０はトランジスタ６の
バイアス電流を流すための抵抗、および、チヨー
クであり、トランジスタ６のコレクタにコンデン
サ８と並列に中心導体１１と可変容量ダイオード
１４との直列回路を接続し、広帯域発振のベース
接地型局部発振回路を成し、１５は接地用のコン
デンサであり、可変容量ダイオード１４のアノー
ド側へ抵抗１６を介して発振制御用の直流電圧を
印加する。局部発振回路の出力を次段のトランジ
スタ１７に印加するための適切なピツクアツプ回
路を使用しないと発振出力レベルが不均一になつ
て好ましくないので、このピツクアツプ回路のピ
ツクアツプコイルとして発振周波数調整用のロー
デイングコイル１２及びコイル１３を用い、ロー
デイングコイル１２とコイル１３とを中心導体１
１に誘導結合するように近接して設けている。そ
して、直流カツト用のコンデンサ１８とコンデン
サ１９とローデイングコイル１２とコイル１３と
が局部発振回路の発振帯域で共振するようにして
次段の増幅器１７に発振信号を伝達する。
上述した局部発振回路を400〜700MHzの帯域で
発振させると、第２図に示すように高域で出力レ
ベルが低下する傾向があり、この原因はトランジ
スタ６の周波数特性にあると考えられる。このよ
うに出力レベルが不内一であると発振信号を混合
回路に入力した際に周波数変換利得が均一でな
く、チユーナとして良好な特性を得ることは出来
ない等の欠点があつた。
本考案はかかる欠点を除去し、均一な特性の出
力レベルを得られるようにしたものでその実施例
を第３図に示し、従来例と相違する所についての
み説明する。なお、従来例と同一部分には同一符
号を付した。
中心導体１１に誘導結合するピツクアツプコイ
ルを２分割してローデイングコイル１２とコイル
１３とで構成し、ローデイングコイル１２とコイ
ル１３との間に１端が接続され、他端が接地され
たコンデンサ２０を設け、ローデイングコイル１
２とコンデンサ２０との共振周波数が局部発振回
路の発振帯域外の高域である700MHz以上になる
ように設定する。その時の回路定数はコンデンサ
２０が6PF、ローデイングコイル１２は５〜6nH
程度の値である。局部発振回路の発振周波数が高
域になると、ローデイングコイル１２とコンデン
サ２０との共振回路内には大電流が流れるため
に、ローデイングコイル１２に流れる電流によつ
て発生する磁束がコイル１３に鎖交することと、
ピツクアツプ回路のインピーダンスが上昇するこ
とで次段トランジスタ１７の入力レベルは、局部
発振回路の出力レベル自体が低下していてもピツ
クアツプ回路のロス分が小さくなるので発振レベ
ルの低下を補正したフラツトな特性のものとな
り、その特性を第２図に示す。
叙上のように本考案はピツクアツプコイルを２
分割してその接続点と接地との間にコンデンサを
設けることによりピツクアツプ回路の高域におけ
るロスを小さくできるので局部発振回路の出力レ
ベルが高域で低下しても十分に補償でき均一した
発振出力が得られ、また、高域でも発振出力が低
下しない高価なトランジスタを使用せでとも安価
なコンデンサを用いることにより均一な発振出力
レベルが得られる等の極めて大きな効果を奏す
る。
【図面の簡単な説明】
第１図は従来の局部発振回路を示す回路図、第
２図は局部発振回路から得られる振発出力レベル
の周波数特性を示すグラフ、第３図は本考案によ
る実施例を示す回路図である。 ６，１７……トランジスタ、７……帰還用コン
デンサ、８……同調用コンデンサ、１１……中心
導体、１２……ローデイングコイル、１３……コ
イル、１４……可変容量ダイオード、２０……コ
ンデンサ。

Claims (1)

    【実用新案登録請求の範囲】
  1. 発振回路の共振インダクタンスを構成する中心
    導体に誘電結合させて、発振出力をとり出す一端
    接地のピツクアツプコイルを分割し、該分割点に
    一端接地のコンデンサの他端を接続し、該コンデ
    ンサと分割された前記ピツクアツプコイルの一部
    とが発振周波数帯域外の高域に共振するようにし
    たことを特徴とする局部発振回路。
JP1979109059U 1979-08-08 1979-08-08 Expired JPS6117613Y2 (ja)

Priority Applications (3)

Application Number Priority Date Filing Date Title
JP1979109059U JPS6117613Y2 (ja) 1979-08-08 1979-08-08
US06/175,953 US4370626A (en) 1979-08-08 1980-08-07 Output coupling circuit for LC local oscillator
CA000357897A CA1149475A (en) 1979-08-08 1980-08-08 Local oscillator circuit

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP1979109059U JPS6117613Y2 (ja) 1979-08-08 1979-08-08

Publications (2)

Publication Number Publication Date
JPS5626411U JPS5626411U (ja) 1981-03-11
JPS6117613Y2 true JPS6117613Y2 (ja) 1986-05-29

Family

ID=14500549

Family Applications (1)

Application Number Title Priority Date Filing Date
JP1979109059U Expired JPS6117613Y2 (ja) 1979-08-08 1979-08-08

Country Status (3)

Country Link
US (1) US4370626A (ja)
JP (1) JPS6117613Y2 (ja)
CA (1) CA1149475A (ja)

Families Citing this family (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS6027204A (ja) * 1983-07-23 1985-02-12 Murata Mfg Co Ltd 発振回路装置
JPS6055223U (ja) * 1983-09-19 1985-04-18 寺崎電気産業株式会社 主母線支持盤体
FR2720879B1 (fr) * 1994-06-03 1996-08-14 Gilles Morey Oscillateur et récepteur comprenant cet oscillateur.
US5870005A (en) * 1997-07-03 1999-02-09 Cheung; Shiu Hung Frequency modulated oscillator for transmitting short range signals

Family Cites Families (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US2798158A (en) * 1953-05-27 1957-07-02 Rca Corp Tunable high frequency oscillator circuit
US3538466A (en) * 1968-11-14 1970-11-03 Rca Corp Television tuner cast housing with integrally cast transmission lines
US3628152A (en) * 1970-02-25 1971-12-14 Rca Corp Television tuning circuit utilizing voltage variable capacitance
US3679990A (en) * 1971-01-27 1972-07-25 Gen Instrument Corp Variable frequency oscillator with substantially linear afc over tuning range
US3855550A (en) * 1973-08-24 1974-12-17 Rca Corp Transistor oscillator with diode in feedback circuit providing amplitude stabilization

Also Published As

Publication number Publication date
US4370626A (en) 1983-01-25
JPS5626411U (ja) 1981-03-11
CA1149475A (en) 1983-07-05

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