JPH04132404A - Voltage controlled oscillator - Google Patents
Voltage controlled oscillatorInfo
- Publication number
- JPH04132404A JPH04132404A JP25581390A JP25581390A JPH04132404A JP H04132404 A JPH04132404 A JP H04132404A JP 25581390 A JP25581390 A JP 25581390A JP 25581390 A JP25581390 A JP 25581390A JP H04132404 A JPH04132404 A JP H04132404A
- Authority
- JP
- Japan
- Prior art keywords
- controlled oscillator
- voltage controlled
- air
- core coil
- ground plane
- 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
- 238000005476 soldering Methods 0.000 abstract description 2
- 230000010355 oscillation Effects 0.000 description 9
- 239000000758 substrate Substances 0.000 description 6
- 238000010586 diagram Methods 0.000 description 4
- 238000010295 mobile communication Methods 0.000 description 3
- 239000003990 capacitor Substances 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000005855 radiation Effects 0.000 description 2
- 241000252233 Cyprinus carpio Species 0.000 description 1
- 230000003321 amplification Effects 0.000 description 1
- 230000001419 dependent effect Effects 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000002184 metal Substances 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
- 230000002093 peripheral effect Effects 0.000 description 1
- 239000011347 resin Substances 0.000 description 1
- 229920005989 resin Polymers 0.000 description 1
Landscapes
- Inductance-Capacitance Distribution Constants And Capacitance-Resistance Oscillators (AREA)
- Interconnected Communication Systems, Intercoms, And Interphones (AREA)
Abstract
Description
【発明の詳細な説明】
産業上の利用分野
本発明は、コードレス電話等の移動体通信装置等に用い
られる電圧制御発振器に関するものである。DETAILED DESCRIPTION OF THE INVENTION Field of the Invention The present invention relates to a voltage controlled oscillator used in mobile communication devices such as cordless telephones.
従来の技術
第３図に一般的な電圧制御発振器のブロック図を示し、
第４図にその具体的回路の一例を示す。Conventional technology Figure 3 shows a block diagram of a general voltage controlled oscillator.
FIG. 4 shows an example of the specific circuit.
第３図において、５は空心コイル共振器を用いた電圧制
御発振器であシ、８は第１増幅器、７は第２増幅器であ
り、出力は発振出力端子１２より出力される。なお１１
は電圧制御端子である。In FIG. 3, 5 is a voltage controlled oscillator using an air-core coil resonator, 8 is a first amplifier, and 7 is a second amplifier, the output of which is output from an oscillation output terminal 12. Note 11
is the voltage control terminal.
第４図は２ｏＯ〜３００Ｍ）ｌｚ帯のコードレス電話用
として用いられる電圧制御発振器の一例である。この周
波数帯で高Ｃ／Ｈの発振器を実現するに、空心コイルＬ
２を用いて、コンデンサＣ，、Ｃ２，Ｃ。FIG. 4 shows an example of a voltage controlled oscillator used for cordless telephones in the 2oO~300M)lz band. To realize a high C/H oscillator in this frequency band, air-core coil L
2, using capacitors C,,C2,C.
および、バリキャップダイオードｐ、で形成される共振
部のＱを高くしている。In addition, the Q of the resonance section formed by the varicap diode p is increased.
またトランジスタＱ１をコレクタ接地型で、エミッタか
ら出力を取出すコルピッツ型発振器として形成し、トラ
ンジスタＱ２ を用いた第１増幅器６およびトランジス
タＱ５を用いた第２増幅器７による２段バッフ１増幅器
全介して発振出力を取出す構成となっている。移動体通
信用の電圧制御発振器は、特に負荷変動による周波数安
定度が要求されるため、２段バッファ増幅器とするのが
一般的である。In addition, the transistor Q1 is formed as a Colpitts oscillator with a common collector type and output is taken from the emitter, and oscillation is performed through a two-stage buffer 1 amplifier consisting of a first amplifier 6 using a transistor Q2 and a second amplifier 7 using a transistor Q5. It is configured to take out the output. Voltage controlled oscillators for mobile communications are generally required to have frequency stability due to load fluctuations, and therefore are generally configured as two-stage buffer amplifiers.
なおＲ７へＲ２は抵抗、Ｃ１〜Ｃ１３はコンデンサ、Ｌ
１〜Ｌ４はインダクタンスである。Note that R2 to R7 is a resistor, C1 to C13 are capacitors, and L
1 to L4 are inductances.
上記のような電圧制御発振器を、送信系、受信系等の周
辺回路を含んだ二ニア）に実装する際の従来の一例が第
５図である。基板１をシールドケース３内に実装し、さ
らにその一部分をシール板１３で囲み、その内に電圧制
御発振器５を実装するという構造となっている。FIG. 5 shows a conventional example of mounting the above-mentioned voltage controlled oscillator in a two-dimensional system including peripheral circuits such as a transmitting system and a receiving system. The circuit board 1 is mounted inside a shield case 3, a part of which is further surrounded by a seal plate 13, and a voltage controlled oscillator 5 is mounted within the shield case 3.
発明が解決しようとする課題
従来例のような実装法の電圧制御発振器の課題は、シー
ルド板１３部に後で被せるシールドカバーの影響を受け
て、高安定、高精度な、発振周波数を得ることが困難で
あることである。故に本発明の目的は、周波数安定度が
高く、高Ｃ／Ｎの電圧制御発振器を提供することである
。Problems to be Solved by the Invention The problem with the voltage controlled oscillator using the conventional mounting method is to obtain a highly stable and highly accurate oscillation frequency under the influence of the shield cover that is later placed on the shield plate 13. is difficult. Therefore, an object of the present invention is to provide a voltage controlled oscillator with high frequency stability and high C/N.
課題を解決するための手段
そしてこの目的全達成するため本発明は空心コイル共振
器を用いた電圧制御発振器を、基板の表面に実装し、前
記電圧制御発振器に対応する基板の裏面側はグランドプ
レーンとし、前記基板の表面側において電圧制御発振器
に、空心コイル調整孔ヲ有するシールドキャンプ全波せ
るとともに、このシールドキャンプの一部は裏面のグラ
ンドプレーンとｔｉ的に導通させたものである。Means for Solving the Problems In order to achieve all of the objects, the present invention includes a voltage controlled oscillator using an air-core coil resonator mounted on the surface of a substrate, and a ground plane on the back side of the substrate corresponding to the voltage controlled oscillator. A full-wave shield camp having an air-core coil adjustment hole is connected to the voltage-controlled oscillator on the front side of the board, and a part of this shield camp is electrically connected to the ground plane on the back surface.
作用
本発明は上記した構成のように、空心コイル共振器型電
圧制御発振器を、基板の表面と裏面間でシールドキャッ
プとグランドプレーンで囲むとともに、シールドキャッ
プの一部にグランドプレーンに電気的に導通させたので
、シールドが安定シ、しかも空心コイル調整孔からの調
整により発振周波数も安定化されることになる。Effect The present invention has the configuration described above, in which an air-core coil resonator type voltage controlled oscillator is surrounded by a shield cap and a ground plane between the front and back surfaces of the board, and a part of the shield cap is electrically connected to the ground plane. As a result, the shield is stabilized, and the oscillation frequency is also stabilized by adjustment from the air-core coil adjustment hole.
実施例
第１図に本発明による電圧制御発振器が実装されたユニ
ットの概観を示し、第２図に本発明による電圧制御発振
器の実装状態を示す。Embodiment FIG. 1 shows an overview of a unit in which a voltage controlled oscillator according to the present invention is mounted, and FIG. 2 shows a state in which the voltage controlled oscillator according to the present invention is mounted.
第１図において、基板１ば、金属製のシールドケース３
内に実装されている。またシールドキャップ２内の基板
１上には、第２図のごとく電圧制御発振器５が実装され
ている。つまり第２図のごとく基板１の表面に、空心コ
イル４は用いた電圧制御発振器６および第１増幅部６を
実装している。In FIG. 1, a board 1, a metal shield case 3
implemented within. Further, a voltage controlled oscillator 5 is mounted on the substrate 1 within the shield cap 2, as shown in FIG. That is, as shown in FIG. 2, a voltage controlled oscillator 6 and a first amplification section 6, which are used in the air-core coil 4, are mounted on the surface of the substrate 1.
また基板１の裏面の半分の電圧制御発振器５側はグラン
ドプレーン８となシ、他の半分は第２増幅部了が実装さ
れている。電圧制御発振器６を覆ったシールドキャップ
２の一部は基板１を貫通し、グランドプレーン８と半田
９付されて電気的に導通されている。また空心コイル４
で発振周波数が調整できるようにシールドキャップ２に
は空心コイル調整孔２ムが設けられている。Further, a ground plane 8 is mounted on the voltage controlled oscillator 5 side of the back half of the substrate 1, and a second amplifier section is mounted on the other half. A portion of the shield cap 2 that covers the voltage controlled oscillator 6 passes through the substrate 1 and is soldered 9 to the ground plane 8 for electrical continuity. Also air core coil 4
The shield cap 2 is provided with an air-core coil adjustment hole 2 so that the oscillation frequency can be adjusted.
以上のような実装法の電圧制御発振器であると、発振周
波数の安定度に最も依存する空心コイル４を用いた共振
器の部分がシールドキャップ２およびグランドプレーン
８で囲まれているだめ、高Ｃ／Ｎ 、高安定な電圧制御
発振器となると共に、発振成分がシールドキャンプ２内
に納まり、不要輻射が少なくなる。In the voltage controlled oscillator using the mounting method described above, the part of the resonator using the air-core coil 4, which is most dependent on the stability of the oscillation frequency, is surrounded by the shield cap 2 and the ground plane 8, so the high C. /N, it becomes a highly stable voltage controlled oscillator, the oscillation component is contained within the shield camp 2, and unnecessary radiation is reduced.
また空心コイル４で周波数調整をした後、樹脂で空心コ
イル４を固定すると、振動にも強く、はとんど周囲の影
響を受けることがなくなる。本実施例では２００〜３０
０ Ｍ Ｈｚ帯電圧制御発振器として、直径０．３ｆｆ
の空心コイ／Ｌ／４を用いて、離調周波数１２．５に田
で７６ ｄＢ／ａ Ｋ ＠、、の高Ｃ／Ｎが得られてお
り、移動体通信用として十分実用化しうる性能が得られ
ている。Furthermore, if the air-core coil 4 is fixed with resin after frequency adjustment with the air-core coil 4, it will be resistant to vibrations and will not be affected by the surrounding environment. In this example, 200 to 30
As a 0 MHz voltage controlled oscillator, diameter 0.3ff
A high C/N of 76 dB/a K@, was obtained at a detuning frequency of 12.5 using an air-core carp/L/4, and the performance is sufficient for practical use in mobile communications. It has been obtained.
発明の効果
以上の実施例から明らかなように、本発明は空心コイル
共振器型電圧制御発振器を、シールドキャップで囲み、
このシールドキャップの一部とグランドプレーンと半田
付けすることにより、発振成分の不要輻射が減少し、空
心コイル共振器のＱがそこなわれることなく、シールド
が安定化し、高Ｃ／Ｎで、発振周波数の高安定な電圧制
御発振器の実現が可能となる。Effects of the Invention As is clear from the above embodiments, the present invention includes an air-core coil resonator type voltage controlled oscillator surrounded by a shield cap,
By soldering a part of this shield cap to the ground plane, unnecessary radiation of the oscillation component is reduced, and the shield is stabilized without damaging the Q of the air-core coil resonator, allowing oscillation with high C/N. It becomes possible to realize a voltage controlled oscillator with a highly stable frequency.
第１図は本発明の電圧制御発振器の一実施例の斜視図、
第２図（ａ）〜（Ｃ）は本発明の電圧制御発振器の一実
施例の表面図、側面断面図、裏面図、第３図は一般的な
電圧制御発振器のブロック図、第４図は一般的な電圧制
御発振器の回路図、第５図は従来の電圧制御発振器の斜
視図である。
１・・・・・・基板、２・・・・・・シールドキャップ
、４・・・・・・空心コイル、５・・・・・・電圧制御
発振器、６・・・・・・第１増幅器、７・・・・・・第
２増幅器、８・・・・・・グランドプレーン。FIG. 1 is a perspective view of an embodiment of the voltage controlled oscillator of the present invention;
FIGS. 2(a) to (C) are a front view, side sectional view, and back view of an embodiment of the voltage controlled oscillator of the present invention, FIG. 3 is a block diagram of a general voltage controlled oscillator, and FIG. 4 is a block diagram of a general voltage controlled oscillator. A circuit diagram of a general voltage controlled oscillator, FIG. 5 is a perspective view of a conventional voltage controlled oscillator. DESCRIPTION OF SYMBOLS 1... Board, 2... Shield cap, 4... Air core coil, 5... Voltage controlled oscillator, 6... First amplifier , 7... Second amplifier, 8... Ground plane.
Claims (1)
面に実装し、前記電圧制御発振器に対応する基板の裏面
側はグランドプレーンとし、前記基板の表面側において
電圧制御発振器に、空心コイル調整孔を有するシールド
キャップを被せるとともに、このシールドキャップの一
部は裏面のグランドプレーンと電気的に導通させた電圧
制御発振器。A voltage controlled oscillator using an air-core coil resonator is mounted on the surface of the board, the back side of the board corresponding to the voltage controlled oscillator is a ground plane, and the voltage controlled oscillator is provided with an air-core coil adjustment hole on the front side of the board. A voltage controlled oscillator is covered with a shield cap having a voltage controlled oscillator, and a part of this shield cap is electrically connected to the ground plane on the back side.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2255813A JP3008467B2 (en) | 1990-09-25 | 1990-09-25 | Voltage controlled oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2255813A JP3008467B2 (en) | 1990-09-25 | 1990-09-25 | Voltage controlled oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPH04132404A true JPH04132404A (en) | 1992-05-06 |
| JP3008467B2 JP3008467B2 (en) | 2000-02-14 |
Family
ID=17283983
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP2255813A Expired - Fee Related JP3008467B2 (en) | 1990-09-25 | 1990-09-25 | Voltage controlled oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JP3008467B2 (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819191B2 (en) | 1999-12-15 | 2004-11-16 | Murata Manufacturing Co., Ltd. | Piezoelectric oscillator unit |
-
1990
- 1990-09-25 JP JP2255813A patent/JP3008467B2/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6819191B2 (en) | 1999-12-15 | 2004-11-16 | Murata Manufacturing Co., Ltd. | Piezoelectric oscillator unit |
Also Published As
| Publication number | Publication date |
|---|---|
| JP3008467B2 (en) | 2000-02-14 |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| LAPS | Cancellation because of no payment of annual fees |