JPS6147002B2 - - Google Patents
Info
- Publication number
- JPS6147002B2 JPS6147002B2 JP59155880A JP15588084A JPS6147002B2 JP S6147002 B2 JPS6147002 B2 JP S6147002B2 JP 59155880 A JP59155880 A JP 59155880A JP 15588084 A JP15588084 A JP 15588084A JP S6147002 B2 JPS6147002 B2 JP S6147002B2
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- oscillation
- capacitor
- oscillator
- transistor
- 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
Links
- 230000010355 oscillation Effects 0.000 claims description 21
- 239000003990 capacitor Substances 0.000 claims description 13
- 238000010586 diagram Methods 0.000 description 8
- 230000000694 effects Effects 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000003071 parasitic effect Effects 0.000 description 1
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
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Description
本発明は、可変容量ダイオードを利用した電圧
制御可変周波数発振器に関するものであり、特に
広帯域に発振周波数を可変ならしめる電圧制御可
変周波数発振器と提供しようとするものである。
従来、VHF帯域以下の電圧制御可変周波数発
振器は、コルピツツ型又はハートレー型と称する
発振器のコンデンサを可変容量ダイオードに置き
換て発振周波数を可変ならしめていた。とろがコ
ルピツツ発振器の構成を示す第１図から明らかな
如く、コンデンサ３を可変容量ダイオードに置き
換てもコンデンサ１，２が付随しているので可変
容量の変化がみかけ上小さくなり発振周波数の可
変範囲が狭く、さらに発振周波数は共振周波数
The present invention relates to a voltage-controlled variable frequency oscillator using a variable capacitance diode, and in particular, it is intended to provide a voltage-controlled variable frequency oscillator whose oscillation frequency can be varied over a wide band. Conventionally, voltage-controlled variable frequency oscillators for the VHF band and below have made the oscillation frequency variable by replacing the capacitor of the Colpitts type or Hartley type oscillator with a variable capacitance diode. As is clear from Figure 1, which shows the configuration of the Toroga-Colpitts oscillator, even if capacitor 3 is replaced with a variable capacitance diode, since capacitors 1 and 2 are attached, the change in variable capacitance is apparently small, making it possible to vary the oscillation frequency. The range is narrow and the oscillation frequency is the resonant frequency
【式】よりも低い周波数となる欠点を有
していた。UHF帯域以上ではこの傾向は、トラ
ンジスタの奇生容量等が加わりさらに大きいもの
であつた。そこで最近では、UHF帯域以上の発
振器は第２図に示す反射形発振器が用いられてい
る。直列共振器６は可変容量ダイオード７とイン
ダクタ８及びコンデンサ９よりなり、その共振周
波数は、バイアス抵抗１６を通して電圧制御端子
１７に印加させられる直流電圧ＶDで変化させら
れる。一方発振用増幅器１０は、トランジスタ１
１とバイアス抵抗１２，１３，１４及び整合用コ
ンデンサ１５とよりなる回路で構成され、トラン
ジスタのベース端子をみた反射係数γが負性抵抗
になつている。第２図の発振器の発振条件は、直
列共振器６の反射係数 とすると
γ・ ＝１ ………(1)
｜γ｜・｜＝１＜γ＋＜＝360・ｎ
ｎ＝±０、１、２ ………(2)
で求まる。
発振周波は後半の＜γ＋＜＝360・ｎ ｎ＝±
０、１、２………で決定されることが知られてい
る。
第３図は反射係数γ及び の周波数による位相
特性である＜γ、＜の特性例である。共振器の位
相特性はダイオード印加電圧ＶDの増大ととも
に、曲線１９，２０，２１となり共振周波数はθ
＝180との交点２２，２３，２４である。一方発
振用増幅器の反射係数γの位相特性は、曲線２５
で示されており、実際の発振周波数は(2)式を満足
する点として２６，２７，２８となる。すなわち
第２図における構成の発振回路でもやはり共振回
路の共振周波数Rと発振周波数Oは大きく異な
り、第４図に示す如く発振周波数特性は曲線２９
になり共振周波数特性３０より可変範囲の狭いも
のであつた。
本発明では前記欠点を直列共振器に並列にコン
デンサを付加しそこで生じた新しい位相特性を利
用して広帯域に周波数を可変できる発振器を提供
するものである。
第５図は本発明の一実施例図である。本考案の
共振器は従来直列共振回路にコンデンサー３１を
並列接続している。そのため共振器の位相特性は
第６図に示される如く、従来曲線３６であつたが
本発明の位相特性は曲線３７の特性となり共振周
波数Oでの傾斜は急しゆんになる。さらに本発
明の発振用増幅器３２を構成しているトランジス
タのエミツタ端子に抵抗３４及びコンデンサ３５
を接続することにより、エミツタ側の反射係数を
変える。この時ベース側の反射係数γの位相動性
は、従来特性の曲線３８から特性のなだらかな曲
線３９に変わる。
本発明の効果は第６図から明らかな如く、発振
周波数rは、r1からr2へと直列共振周波０
に近づく、さらに発振用増幅器の位相特性が変わ
つているので、並列コンデンサ３３による従来の
発振用増幅器特性に生じる発振条件を満足する周
波数r0を解消し、奇生発振又は異常発振がな
く、安定した発振出力が得られる。
第７図は電圧制御可変周波数発振器の従来例特
性と本発明の一実施例による特性を比較したもの
であり、本発明によれば可変範囲が広くなつてお
り、その効果が明らかである。但し曲線４０は従
来例、曲線４１は本発明例による特性である。It had the disadvantage that the frequency was lower than that of [Formula]. Above the UHF band, this tendency was even greater due to the addition of parasitic capacitance of transistors. Therefore, recently, a reflection type oscillator shown in FIG. 2 has been used as an oscillator for the UHF band or above. The series resonator 6 is composed of a variable capacitance diode 7, an inductor 8, and a capacitor 9, and its resonant frequency is changed by a DC voltage V D applied to a voltage control terminal 17 through a bias resistor 16. On the other hand, the oscillation amplifier 10 includes a transistor 1
1, bias resistors 12, 13, and 14, and a matching capacitor 15, and the reflection coefficient γ viewed from the base terminal of the transistor is a negative resistance. The oscillation conditions for the oscillator in Fig. 2 are the reflection coefficient of the series resonator 6, then γ・=1 ………(1) |γ|・|=1<γ+<=360・n n=±0, 1, 2 ......(2). The oscillation frequency is the latter half <γ+<=360・n n=±
It is known that it is determined by 0, 1, 2... FIG. 3 is an example of the characteristic of <γ, <, which is the phase characteristic depending on the reflection coefficient γ and the frequency. As the diode applied voltage V D increases, the phase characteristics of the resonator become curves 19, 20, and 21, and the resonant frequency becomes θ.
=180 at intersections 22, 23, and 24. On the other hand, the phase characteristic of the reflection coefficient γ of the oscillation amplifier is curve 25
The actual oscillation frequencies are 26, 27, and 28 as points that satisfy equation (2). In other words, even in the oscillation circuit configured as shown in FIG. 2, the resonant frequency R and the oscillation frequency O of the resonant circuit are significantly different, and the oscillation frequency characteristic is as shown in curve 29 as shown in FIG.
Therefore, the variable range was narrower than that of the resonance frequency characteristic 30. The present invention solves the above-mentioned drawbacks by providing an oscillator that can vary the frequency over a wide band by adding a capacitor in parallel to the series resonator and utilizing the new phase characteristics produced there. FIG. 5 is a diagram showing an embodiment of the present invention. In the resonator of the present invention, a capacitor 31 is connected in parallel to a conventional series resonant circuit. Therefore, as shown in FIG. 6, the phase characteristic of the resonator was a conventional curve 36, but the phase characteristic of the present invention becomes a curve 37, and the slope at the resonance frequency O becomes steeper. Further, a resistor 34 and a capacitor 35 are connected to the emitter terminal of the transistor constituting the oscillation amplifier 32 of the present invention.
By connecting , the reflection coefficient on the emitter side can be changed. At this time, the phase dynamics of the reflection coefficient γ on the base side changes from the curve 38 of the conventional characteristic to the gentle curve 39 of the characteristic. As is clear from FIG. 6, the effect of the present invention is that the oscillation frequency r changes from r1 to r2 to the series resonant frequency 0.
Furthermore, since the phase characteristics of the oscillation amplifier have changed, the frequency r0 that satisfies the oscillation conditions that occurs in the conventional oscillation amplifier characteristics using the parallel capacitor 33 is eliminated, and there is no strange or abnormal oscillation and a stable Oscillation output can be obtained. FIG. 7 compares the characteristics of a conventional voltage controlled variable frequency oscillator with the characteristics according to an embodiment of the present invention. According to the present invention, the variable range is widened, and its effect is clear. However, the curve 40 is the characteristic of the conventional example, and the curve 41 is the characteristic according to the example of the present invention.
第１図はコルピツツ発振器の構成図、第２図は
従来例における電圧制御可変周波数発振器の回路
図、第３図は発振特性説明図、第４図は共振器特
性図、第５図は本発明の一実施例における電圧制
御可変周波数発振器の回路図、第６図、第７図は
同発振器説明のための特性図である。
７……可変容量ダイオード、８……インダク
タ、３３……コンデンサ、１１……トランジス
タ、３５……コンデンサ、３４……抵抗。
Fig. 1 is a configuration diagram of a Colpittz oscillator, Fig. 2 is a circuit diagram of a conventional voltage controlled variable frequency oscillator, Fig. 3 is an explanatory diagram of oscillation characteristics, Fig. 4 is a resonator characteristic diagram, and Fig. 5 is a diagram of the present invention. A circuit diagram of a voltage controlled variable frequency oscillator in one embodiment, and FIGS. 6 and 7 are characteristic diagrams for explaining the oscillator. 7... Variable capacitance diode, 8... Inductor, 33... Capacitor, 11... Transistor, 35... Capacitor, 34... Resistor.
Claims (1)
構成した直列共振回路にコンデンサを並列接続し
た回路をトランジスタのベース端子と接地端子の
間に接続し、かつ前記トランジスタのエミツタ端
子と接地端子間に抵抗とコンデンサの直列接続回
路を接続し、前記トランジスタのコレクタ端子よ
り発振出力を取り出すことを特徴とする電圧制御
可変周波数発振器。1. A series resonant circuit formed by connecting an inductor to a variable capacitance diode and a capacitor connected in parallel is connected between the base terminal of the transistor and the ground terminal, and a resistor and the capacitor are connected between the emitter terminal of the transistor and the ground terminal. A voltage-controlled variable frequency oscillator, characterized in that a series-connected circuit is connected, and an oscillation output is taken out from a collector terminal of the transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59155880A JPS6062705A (en) | 1984-07-26 | 1984-07-26 | Voltage controlled variable frequency oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP59155880A JPS6062705A (en) | 1984-07-26 | 1984-07-26 | Voltage controlled variable frequency oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS6062705A JPS6062705A (en) | 1985-04-10 |
| JPS6147002B2 true JPS6147002B2 (en) | 1986-10-17 |
Family
ID=15615522
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP59155880A Granted JPS6062705A (en) | 1984-07-26 | 1984-07-26 | Voltage controlled variable frequency oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6062705A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3740977B2 (en) | 1999-12-22 | 2006-02-01 | 株式会社村田製作所 | Voltage-controlled oscillator and electronic device using the same |
-
1984
- 1984-07-26 JP JP59155880A patent/JPS6062705A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS6062705A (en) | 1985-04-10 |
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