JPH01208902A - Voltage controlled oscillator - Google Patents
Voltage controlled oscillatorInfo
- Publication number
- JPH01208902A JPH01208902A JP3313288A JP3313288A JPH01208902A JP H01208902 A JPH01208902 A JP H01208902A JP 3313288 A JP3313288 A JP 3313288A JP 3313288 A JP3313288 A JP 3313288A JP H01208902 A JPH01208902 A JP H01208902A
- Authority
- JP
- Japan
- Prior art keywords
- terminal
- variable capacitance
- controlled oscillator
- inductance
- voltage controlled
- 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
Links
- 230000008878 coupling Effects 0.000 claims abstract description 12
- 238000010168 coupling process Methods 0.000 claims abstract description 12
- 238000005859 coupling reaction Methods 0.000 claims abstract description 12
- 230000010355 oscillation Effects 0.000 claims description 20
- 238000010897 surface acoustic wave method Methods 0.000 claims description 4
- 239000003990 capacitor Substances 0.000 abstract description 5
- 230000009977 dual effect Effects 0.000 abstract 2
- 238000010586 diagram Methods 0.000 description 3
- 230000037431 insertion Effects 0.000 description 2
- 238000003780 insertion Methods 0.000 description 2
- 230000010363 phase shift Effects 0.000 description 1
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は電圧制御発振器に関するものであり、特に高周
波用発振器として有効なものに関する。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a voltage controlled oscillator, and particularly to one that is effective as a high frequency oscillator.
従来の技術
第３図に、従来の一般的な電圧制御発振器の−構成例を
示す。すなわち、増幅器１９発振周波数決定素子２．移
相器３により、図のように発振ループを形成し増幅器１
の出力から、分校器４を介して出力端子６から発振出力
を取り出す構成である。６は電圧制御端子である。BACKGROUND OF THE INVENTION FIG. 3 shows an example of the configuration of a conventional general voltage controlled oscillator. That is, amplifier 19 oscillation frequency determining element 2. The phase shifter 3 forms an oscillation loop as shown in the figure, and the amplifier 1
The configuration is such that an oscillation output is extracted from an output terminal 6 via a branching device 4. 6 is a voltage control terminal.
このループの発振条件は式（１）および（２）に示す通
シである。The oscillation conditions for this loop are as shown in equations (1) and (2).
ＧＡ＋Ｌｓ＋Ｌ、＞１ ・・川・（１）
θ、＋０３十〇Ｐ ＝ ２ ｎ ｆ ・・・
・・・（２）ここで、Ｇ□、θ、は増幅器１の利得およ
び位相遅れ、Ｌ３．θ８は発振周波数決定素子２の損失
および位相遅れ、ＬＰ、θ２は移相器の損失および位相
遅れ、ｎは整数を示す。GA+Ls+L,>1 ・・River・(1)
θ, +03〇P = 2 n f...
...(2) Here, G□, θ are the gain and phase delay of amplifier 1, L3. θ8 is the loss and phase delay of the oscillation frequency determining element 2, LP, θ2 is the loss and phase delay of the phase shifter, and n is an integer.
このような構成の発振器を電圧制御発振器（ＶＣＯ）と
して使用するには、発振周波数決定素子２の発振可能な
周波数範囲における位相遅れ量の分だけ、移相器３０位
相遅れ量を制御電圧６により可変すればよい。In order to use an oscillator with such a configuration as a voltage controlled oscillator (VCO), the amount of phase delay of the phase shifter 30 is adjusted by the control voltage 6 by the amount of phase delay in the frequency range in which the oscillation frequency determining element 2 can oscillate. Just make it variable.
発明が解決しようとする課題
上記に示す従来例において、良好な特性のｖＣＯを実現
するには、発振周波数決定素子２のＱが高い事、移相器
３のロスが小さく、位相可変量が大きく、直線性が良い
事、又、特に移相器の構成が簡単でバラツキが少ない事
など、種々の条件が必要となる。Problems to be Solved by the Invention In the conventional example shown above, in order to achieve vCO with good characteristics, the Q of the oscillation frequency determining element 2 must be high, the loss of the phase shifter 3 must be small, and the amount of phase variation must be large. Various conditions are required, such as good linearity and, in particular, that the phase shifter has a simple configuration with little variation.
従来、−船釣には、移相器３０部分を、相互インダクタ
ンスあるいは容量結合などによる複同調回路で構成して
いたが、問題点として、第１に広帯域に低ロスの複同調
回路を構成することが困難であること、第２に、特に相
互インダクタンス結合による複同調回路では、相互イン
ダクタンス輩の値にバラツキがあるため入出力間の位相
遅れにバラツキが生じやすいこと、第３に、回路構成が
複雑であるため、バラツキが生じやすいことなどがあげ
られる。特にこれらの問題は高周波帯になるほど大きく
なってくる。Conventionally, for boat fishing, the phase shifter 30 section was configured with a double-tuned circuit using mutual inductance or capacitive coupling, but the first problem was that it was necessary to configure a double-tuned circuit with a wide band and low loss. Second, especially in double-tuned circuits using mutual inductance coupling, there are variations in the mutual inductance value, which tends to cause variations in the phase delay between input and output. Third, the circuit configuration Because it is complex, it is easy for variations to occur. In particular, these problems become more serious as the frequency band becomes higher.
課題を解決するための手段
本発明は上記課題を解決するため、増幅器と発振周波数
決定素子と移相器により発振ループを形成するとともに
、前記移相器は、第１および第２の中間タップ付インダ
クタンス素子の各々の一方の端子を接地し、各々の他方
の端子に第１および第２の可変容量ダイオードのアノー
ド端子を接続し、第１および第２の可変容量ダイオード
のカソード端子に第３の可変容量ダイオードのカソード
端子を接続し、第３の可変容量ダイオードのアノード端
子を接地し、前記第１．第２．第３の可変容量ダイオー
ドのカソード端子を電圧制御端子に接続し、前記第１お
よび第２のインダクタンス素子の中間タップには結合容
量を介して入出力端子を接続したものである。Means for Solving the Problems In order to solve the above problems, the present invention forms an oscillation loop by an amplifier, an oscillation frequency determining element, and a phase shifter, and the phase shifter has first and second intermediate taps. One terminal of each of the inductance elements is grounded, the anode terminals of the first and second variable capacitance diodes are connected to the other terminal of each inductance element, and the cathode terminals of the first and second variable capacitance diodes are connected to the third terminal. The cathode terminal of the variable capacitance diode is connected, the anode terminal of the third variable capacitance diode is grounded, and the first... Second. The cathode terminal of the third variable capacitance diode is connected to the voltage control terminal, and the input/output terminal is connected to the intermediate tap of the first and second inductance elements via a coupling capacitor.
作用
本発明は上記した構成により、２つの可変容量ダイオー
ドのカソード端子と接地端子の間に可変容量ダイオード
を接続することにより、よシ簡単な構成で、広帯域な複
同調回路を構成した移相器を用いて、良好な特性のＶＣ
Ｏを実現している。Effect of the Invention The present invention provides a phase shifter having the above-mentioned configuration, in which a wideband double-tuned circuit is constructed with a simple configuration by connecting a variable capacitance diode between the cathode terminal and the ground terminal of two variable capacitance diodes. VC with good characteristics using
O is realized.
実施例
第１図は本発明による電圧制御発振器の一実施例を示す
。第３図と同じ作用のものには同じ符号をつけている。Embodiment FIG. 1 shows an embodiment of a voltage controlled oscillator according to the present invention. Components with the same effect as in Fig. 3 are given the same reference numerals.
第１の同調回路は中間タップ付インダクタンス素子Ｌ１
、可変容量ダイオードＤ、およびＤ３で形成され、第
２の同調回路は中間タップ付インダクタンス素子Ｌ２
、可変容量ダイオードＤ２．Ｄ。The first tuned circuit is an inductance element L1 with a center tap.
, variable capacitance diodes D, and D3, and the second tuning circuit includes an intermediate tapped inductance element L2.
, variable capacitance diode D2. D.
で形成されている。２つの同調回路は共通の可変容量ダ
イオードＤ３で容量結合され、広帯域な複同調回路を形
成している。入力端子７とり、の中間タップ間に結合容
量Ｃ１が、出力端子８とＬ２の中間タップ間に結合容量
Ｃ２が接続されている。It is formed of. The two tuned circuits are capacitively coupled by a common variable capacitance diode D3 to form a wideband double tuned circuit. A coupling capacitor C1 is connected between the intermediate taps of the input terminal 7 and L2, and a coupling capacitor C2 is connected between the intermediate taps of the output terminal 8 and L2.
また可変容量ダイオードＤ、、Ｄ２の各々のカソード端
子には高抵抗Ｒ１を介して制御電圧端子６よシ制御電圧
が印加され、これにより各々の可変容量ダイオードＤ、
〜Ｄ３の容量が可変され、広帯域な複同調回路の同調周
波数が変化し、ある周波数の点での位相が広範囲に可変
される。ここで、結合容量は可変容量ダイオードで構成
する事により、比帯域がほぼ一定な可変同調回路を形成
できるので、広範囲に位相の直線性が良好になる。Further, a control voltage is applied to the cathode terminal of each of the variable capacitance diodes D, D2 via a control voltage terminal 6 via a high resistance R1, thereby causing each of the variable capacitance diodes D,
~The capacitance of D3 is varied, the tuning frequency of the broadband double-tuned circuit is varied, and the phase at a certain frequency point is varied over a wide range. Here, by configuring the coupling capacitance with a variable capacitance diode, a variable tuning circuit with a substantially constant fractional band can be formed, so that phase linearity can be improved over a wide range.
一実施例として、Ｄ、、Ｄ２．Ｄ、にＶム３３４を用い
て、Ｌ、Ｃを適尚な値に選べば、５００ ＭＨｚ帯にお
ける移相器として、位相可変量約１８ｏ０／ １．５〜
１１．５ ”ｉ 、挿入損１．５〜３．０ ｄＢ ／１
．５〜１１．５Ｖと、広範囲に直線性良好で、低挿入損
の特性が得られている。この移相器３と、発振周波数決
定素子２として表面弾性波共振器を用いて実現したｓ
ｏ ＯＭＨｚ帯電圧制御発振器の特性例を第２図に示す
。発振周波数可変範囲が、約２００ＫＨ２／３〜１２７
と、弾性表面波共振器の直線性をそこなうことなく、良
好な電圧制御発振器を実現していることが判かる。As an example, D, , D2. If you use Vmu334 for D and select appropriate values for L and C, the phase shift amount will be approximately 180/1.5 as a phase shifter in the 500 MHz band.
11.5”i, insertion loss 1.5-3.0 dB/1
．． Good linearity over a wide range of 5 to 11.5 V and low insertion loss characteristics were obtained. s realized using this phase shifter 3 and a surface acoustic wave resonator as the oscillation frequency determining element 2.
o An example of the characteristics of an OMHz voltage controlled oscillator is shown in Figure 2. Oscillation frequency variable range is approximately 200KH2/3 to 127
It can be seen that a good voltage controlled oscillator is realized without impairing the linearity of the surface acoustic wave resonator.
発明の効果
以上の実施例から明らかなように、本発明によると次の
ような効果がある。Effects of the Invention As is clear from the above embodiments, the present invention has the following effects.
（１）増幅器と発振周波数決定素子と移相器により発振
ループを形成する発振器で、移相器については、２つの
中間タップ付インダクタンス素子の各々の一方の端子を
接地し、各々の開放端子側に、可変容量ダイオードのア
ノード端子を接続し、カソード端子同志と、接地端子間
に、可変容量ダイオードによる結合容量を接続し、各各
の可変容量ダイオードのカソード端子を電圧制御端子、
インダクタンス素子の中間タップよシ結合容量を入出力
端子を接続して構成することにより、簡単な回路構成で
、低ロスで、直線性良好な位相の広範囲可変が可能な移
相器を発振ループ内にもつ電圧制御発振器を提供できる
。(1) An oscillator that forms an oscillation loop with an amplifier, an oscillation frequency determining element, and a phase shifter.For the phase shifter, one terminal of each of the two intermediate tapped inductance elements is grounded, and each open terminal side is The anode terminal of the variable capacitance diode is connected to the anode terminal of the variable capacitance diode, the coupling capacitance of the variable capacitance diode is connected between the cathode terminals and the ground terminal, and the cathode terminal of each variable capacitance diode is connected to the voltage control terminal,
By configuring the center tap of the inductance element and the coupling capacitance by connecting the input and output terminals, a phase shifter with a simple circuit configuration, low loss, and good linearity that can vary the phase over a wide range can be created within the oscillation loop. It is possible to provide a voltage controlled oscillator with
（２）上記第１項の構成に加えて、発振周波数決定素子
に表面弾性波共振器を用いることにより、共振器のＱが
高いため、低雑音で、直線性良好な電圧制御発振器とな
る。(2) In addition to the configuration in item 1 above, by using a surface acoustic wave resonator as the oscillation frequency determining element, the Q of the resonator is high, resulting in a voltage controlled oscillator with low noise and good linearity.
第１図は本発明の一実施例の電圧制御発振器のブロック
図、第２図は同電圧制御発振器の特性図、第３図は従来
の電圧制御発振器のブロック図である。
１・・・・・・増幅器、２・・・・・・発振周波数決定
素子、３・・・・・・移相器、４・・・・・・分枝器、
５・・・・・・発振出力端子、６・・・・・・電圧制御
端子、Ｄ、〜Ｄ３・・・・・・可変容量ダイオード、Ｌ
、、Ｌ２・・・・・・中間タップ付インダクタンス素子
、Ｃ，、Ｃ２・・・・・・結合容量、Ｒ１・・・・・・
抵抗。
代理人の氏名 弁理士 中 尾 敏 男 ほか１名第１
図
第２図
参Ｊ １＃ 喝に 圧 （７）FIG. 1 is a block diagram of a voltage controlled oscillator according to an embodiment of the present invention, FIG. 2 is a characteristic diagram of the voltage controlled oscillator, and FIG. 3 is a block diagram of a conventional voltage controlled oscillator. 1...Amplifier, 2...Oscillation frequency determining element, 3...Phase shifter, 4...Brancher,
5...Oscillation output terminal, 6...Voltage control terminal, D, ~D3...Variable capacitance diode, L
,, L2... Inductance element with center tap, C,, C2... Coupling capacitance, R1...
resistance. Name of agent: Patent attorney Toshio Nakao and 1 other person No. 1
Figure 2 Reference J 1# Pressure (7)
Claims (2)
ループを形成するとともに、前記移相器は第１および第
２の中間タップ付インダクタンス素子の各々の一方の端
子を接地し、各々の他方の端子に第１および第２の可変
容量ダイオードのアノード端子を接続し、第１および第
２の可変容量ダイオードのカソード端子に第３の可変容
量ダイオードのカソード端子を接続し、第３の可変容量
ダイオードのアノード端子を接地し、前記第１、第２、
第３の可変容量ダイオードのカソード端子を電圧制御端
子に接続し、前記第１および第２のインダクタンス素子
の中間タップには結合容量を介して入、出力端子を接続
した電圧制御発振器。(1) An oscillation loop is formed by an amplifier, an oscillation frequency determining element, and a phase shifter, and the phase shifter grounds one terminal of each of the first and second intermediate tapped inductance elements, and the other terminal of each of the first and second intermediate tapped inductance elements. The anode terminals of the first and second variable capacitance diodes are connected to the terminals of, the cathode terminals of the third variable capacitance diode are connected to the cathode terminals of the first and second variable capacitance diodes, and the third variable capacitance The anode terminal of the diode is grounded, and the first, second,
A voltage controlled oscillator in which a cathode terminal of a third variable capacitance diode is connected to a voltage control terminal, and input and output terminals are connected to intermediate taps of the first and second inductance elements via a coupling capacitance.
る特許請求の範囲第１項記載の電圧制御発振器。(2) The voltage controlled oscillator according to claim 1, in which a surface acoustic wave resonator is used as the oscillation frequency determining element.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3313288A JP2715427B2 (en) | 1988-02-16 | 1988-02-16 | Voltage controlled oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP3313288A JP2715427B2 (en) | 1988-02-16 | 1988-02-16 | Voltage controlled oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH01208902A true JPH01208902A (en) | 1989-08-22 |
| JP2715427B2 JP2715427B2 (en) | 1998-02-18 |
Family
ID=12378075
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP3313288A Expired - Fee Related JP2715427B2 (en) | 1988-02-16 | 1988-02-16 | Voltage controlled oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP2715427B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6778022B1 (en) * | 2001-05-17 | 2004-08-17 | Rf Micro Devices, Inc. | VCO with high-Q switching capacitor bank |
-
1988
- 1988-02-16 JP JP3313288A patent/JP2715427B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6778022B1 (en) * | 2001-05-17 | 2004-08-17 | Rf Micro Devices, Inc. | VCO with high-Q switching capacitor bank |
Also Published As
| Publication number | Publication date |
|---|---|
| JP2715427B2 (en) | 1998-02-18 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |