JPS6010901A - Oscillating circuit - Google Patents
Oscillating circuitInfo
- Publication number
- JPS6010901A JPS6010901A JP11931283A JP11931283A JPS6010901A JP S6010901 A JPS6010901 A JP S6010901A JP 11931283 A JP11931283 A JP 11931283A JP 11931283 A JP11931283 A JP 11931283A JP S6010901 A JPS6010901 A JP S6010901A
- Authority
- JP
- Japan
- Prior art keywords
- oscillation
- crystal resonator
- transistor
- parallel
- inductance element
- 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.)
- Pending
Links
- 230000010355 oscillation Effects 0.000 claims abstract description 39
- 239000013078 crystal Substances 0.000 claims abstract description 30
- 230000002159 abnormal effect Effects 0.000 claims abstract description 11
- 230000001939 inductive effect Effects 0.000 abstract description 2
- 239000003990 capacitor Substances 0.000 description 13
- 230000000694 effects Effects 0.000 description 6
- 238000010586 diagram Methods 0.000 description 5
- 238000013459 approach Methods 0.000 description 3
- 238000012937 correction Methods 0.000 description 3
- 230000003321 amplification Effects 0.000 description 2
- 238000003199 nucleic acid amplification method Methods 0.000 description 2
- 238000007796 conventional method Methods 0.000 description 1
- 230000008878 coupling Effects 0.000 description 1
- 238000010168 coupling process Methods 0.000 description 1
- 238000005859 coupling reaction Methods 0.000 description 1
- 230000001771 impaired effect Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification 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
- H03B5/30—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator
- H03B5/32—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator
- H03B5/36—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device
- H03B5/362—Generation of oscillations using amplifier with regenerative feedback from output to input with frequency-determining element being electromechanical resonator being a piezoelectric resonator active element in amplifier being semiconductor device the amplifier being a single transistor
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
Description
【発明の詳細な説明】
〔発明の技術分野〕
この発明は、水晶振動子を用いた発振回路の改良に関す
る。DETAILED DESCRIPTION OF THE INVENTION [Technical Field of the Invention] The present invention relates to an improvement in an oscillation circuit using a crystal resonator.
周知のように、例えばスーパヘテロゲイン方式受信機の
固定局部発振回路や送信機の基本（搬送波）発振回路等
には、水晶振動子を用いた発振回路が多く用いられてい
る。第１図はこのような水晶振動子を用いた従来の発振
回路（コルピッツ形）を示すものである。As is well known, oscillation circuits using crystal oscillators are often used, for example, in fixed local oscillation circuits of superhetero gain type receivers, basic (carrier wave) oscillation circuits of transmitters, and the like. FIG. 1 shows a conventional oscillation circuit (Colpitts type) using such a crystal resonator.
すなわち、図中Ｉｔは水晶振動子であシ。That is, It in the figure is a crystal oscillator.
１２はＮＰＮ形の増幅用トランジスタであり、コンデン
サ１３及びコイル１４は容量性となるように水晶振動子
ＩＩの発振周波数に対して同調周波数が低くなるように
設定されたタンク回路Ｉ５を構成しておシ、１６はコル
ピッツ回路におけるトランジスタＩ２のベース−エミッ
タ間に介在される容量分割用のコンデンサであり、コン
デンサ１７及び抵抗１８はデカツブ回路ｒｙを構成して
おシ％ ２０はトランジスタ１２のエミッタから出力端
子２１に発振出力をとるだめのカップリングコンデンサ
であシ、２２はトランジスタ１２のコレクターベース間
に接続されたバイアス抵抗である。12 is an NPN type amplification transistor, and a capacitor 13 and a coil 14 constitute a tank circuit I5 whose tuning frequency is set to be lower than the oscillation frequency of the crystal oscillator II so as to be capacitive. 16 is a capacitor for dividing the capacitance interposed between the base and emitter of transistor I2 in the Colpitts circuit, and capacitor 17 and resistor 18 constitute a large circuit.20 is from the emitter of transistor 12. It is a coupling capacitor for taking the oscillation output to the output terminal 21, and 22 is a bias resistor connected between the collector and base of the transistor 12.
ところで、上記水晶振動子ＩＩの等価回路は、第２図に
示すように、直列接続されたコイルＬｏ 、コンデンサ
ＣＯ及び抵抗ＲＯに、コンデンサＣｍを並列接続したも
のとして表わすことができ、かつそのリアクタンスＸ−
周波数ｆ特性は、第３図に示すようになることが知られ
ている。この場合、直列共振周波数ｆｓは、−□ ・・
・・・・・・・・・・・・・・・・■ｆ８−２π囚Ｔ６
となシ、並列共振周波数ｆＰは、
０
ｆＰ−ｆｓ（１＋２゜ｍ）・・・・・・・・・・・・■
となる。By the way, as shown in FIG. 2, the equivalent circuit of the crystal resonator II can be expressed as a coil Lo, a capacitor CO, and a resistor RO connected in series, and a capacitor Cm connected in parallel. X-
It is known that the frequency f characteristic is as shown in FIG. In this case, the series resonant frequency fs is -□...
・・・・・・・・・・・・・・・ ■ f8-2π T6 And the parallel resonance frequency fP is 0 fP-fs (1+2゜m)... ...■
becomes.
ここで、第１図に示したような発振回路にあっては、例
えば水晶振動子１１が複数個あってそれらを切換えるた
めの図示しかい電子スイッチや、水晶振動子ＩＩが接続
される図示しない印刷配線板の回路パターン等の影響に
よって。Here, in the oscillation circuit as shown in FIG. 1, for example, there is a plurality of crystal oscillators 11, and an electronic switch (not shown) to which the crystal oscillator II is connected is used to switch between them. Due to the influence of circuit patterns on printed wiring boards, etc.
水晶振動子ＩＩに対して第１図中点線で示すように、浮
遊容量Ｃ８が付加されることが多々ある。この浮遊容量
Ｃ８は、水晶振動子ＩＩに対して並列に存在するため、
実質的に上記コンデンサＣｍの容量が増加したことにな
る。このため、上記０式から明らかなように、並列共振
周波数ｆＰが低くなり、直列共振周波数ｆｓに近づくこ
とになる。このようになると、第３図における誘導性領
域（図中斜線で示す領域）がせまくなシ、発振条件が悪
化し起動しにくくなるものである。A stray capacitance C8 is often added to the crystal resonator II, as shown by the dotted line in FIG. Since this stray capacitance C8 exists in parallel to the crystal oscillator II,
This means that the capacitance of the capacitor Cm is substantially increased. Therefore, as is clear from the above equation 0, the parallel resonant frequency fP becomes lower and approaches the series resonant frequency fs. In this case, the inductive area (the area indicated by diagonal lines in the figure) in FIG. 3 becomes narrow and the oscillation conditions worsen, making it difficult to start up.
そこで、従来では、水晶振動子ＩＩとトランジスタ１２
のベースとの間に、インダクタンス素子としてコイル２
３を介在させ、並列共振周波数ｆＰが直列共振周波数ｆ
８に近づかないように補正している。しかしながら、コ
イル２３を介在させた場合、該コイル２３と上記コンデ
ンサＣｍ及び浮遊容量Ｃ８の並列合成容量との直列共振
周波数で発振することがあシ、この異常発振レベルが高
くなるとトランジスタ１２がそのベース−エミッタの整
流作用によシカットオフ状態に追い込まれ、間欠発振を
起こすという不都合が生じる。Therefore, conventionally, the crystal resonator II and the transistor 12
Coil 2 is connected as an inductance element between the base of
3, the parallel resonant frequency fP becomes the series resonant frequency f
I have corrected it so that it does not approach 8. However, when the coil 23 is interposed, oscillation may occur at the series resonance frequency of the coil 23 and the parallel combined capacitance of the capacitor Cm and the stray capacitance C8, and when this abnormal oscillation level becomes high, the transistor 12 - The rectification effect of the emitter forces the emitter into a cut-off state, causing the inconvenience of intermittent oscillation.
このため、従来では、さらに上記コイル２３に並列に抵
抗２４を接続し、異常発振レベルを低く抑えるようにし
ている。ところが、抵抗２、を接続すると、・イ・し２
３のＱが低シ該コイル２３の補正効果が損なわれてしま
うとともに、水晶振動子ＩＩの等価抵抗値をも増加させ
てしまうという問題が生じるものである。For this reason, conventionally, a resistor 24 is further connected in parallel to the coil 23 to suppress the level of abnormal oscillation. However, when resistor 2 is connected, ・I・shi2
If the Q of 3 is low, the correction effect of the coil 23 will be impaired and the equivalent resistance value of the crystal resonator II will also increase.
この発明は上記事情を考慮してｋされたもので、水晶振
動子とトランジスタの制御電極との間に介在されたイン
ダクタンス素子の補正効果を損なうことなく、発振を円
滑に起動し異常発振を防＋ｌ−ｌ−、得る極めて良好な
発振回路を提供することを目的とする。This invention was developed in consideration of the above circumstances, and it is possible to smoothly start oscillation and prevent abnormal oscillation without impairing the correction effect of the inductance element interposed between the crystal resonator and the control electrode of the transistor. The object of the present invention is to provide an extremely good oscillation circuit that obtains a +l-l-.
す々わち、この発明は、一端が基準電位点に接続された
水晶振動子と、この水晶振動子の他端が一端に接続され
たインダクタンス素子と、このインダクタンス素子の他
端が制御電極に接続され第１の被制御電極が電源端に接
続されたトランジスタと、このトランジスタの第２の被
制御電極と前記基準電位点との間に介在されたタンク回
路とを備えた発振回路において、前記インダクタンス素
子にダイオードを並列接続し、前記インダクタンス素子
と前記水晶振動子の持つ容量成分及び該水晶振動子に並
列に存在する浮遊容量の合成容量との直列共振周波数に
よる異常発振を抑制するようにしてなることを特徴とす
るものである。In other words, this invention comprises a crystal resonator with one end connected to a reference potential point, an inductance element with the other end of the crystal resonator connected to one end, and the other end of this inductance element connected to a control electrode. In the oscillation circuit, the oscillation circuit includes a transistor connected to the transistor and having a first controlled electrode connected to a power supply terminal, and a tank circuit interposed between the second controlled electrode of the transistor and the reference potential point. A diode is connected in parallel to the inductance element to suppress abnormal oscillation due to the series resonance frequency of the inductance element, a capacitance component of the crystal resonator, and a combined capacitance of stray capacitance existing in parallel with the crystal resonator. It is characterized by:
以下、この発明の一実施例について図面を参照して詳細
に説明する。第４図において、第１図と同一部分には同
一記号を符して示［７、ここでは異なる部分についての
み説明する。すなわち、前記抵抗２４に代えて、ダイオ
ード２５をそのアノードがトランジスタ１２のベース側
となるように、コイル２３に対して並列接続するように
したことが、従来と異なる部分である。Hereinafter, one embodiment of the present invention will be described in detail with reference to the drawings. In FIG. 4, parts that are the same as those in FIG. 1 are denoted by the same symbols [7] Only the different parts will be explained here. That is, the difference from the conventional method is that instead of the resistor 24, a diode 25 is connected in parallel to the coil 23 so that its anode is on the base side of the transistor 12.
このような構成によれば、まず水晶振動子ＩＩの起動時
等、発振レベルの低い場合には、コイル２３の作用によ
って、氷晶振動子ＩＩの等価容量Ｃｍに浮遊容量Ｃｓが
加えられることにより、並列共振周波数ｆＰが直列共振
周波数ｆｓに近づくことを十分に補正することができ、
発振を円滑に起動させることができるものである。According to such a configuration, when the oscillation level is low, such as when starting up the crystal oscillator II, the stray capacitance Cs is added to the equivalent capacitance Cm of the ice crystal oscillator II by the action of the coil 23. , it is possible to sufficiently correct the fact that the parallel resonant frequency fP approaches the series resonant frequency fs,
This allows oscillation to be started smoothly.
また、コイル２３と、コンデンサＣｍ及び浮遊容量Ｃｓ
の並列合成容量との直列共振周波数による異常振動が成
長し、そのレベルが高くなると、トランジスタｚ２がカ
ットオフ状態に力る前に上記ダイオード２５０作用によ
って異常発振レベルがおさえられ、間欠発振等が生じな
いようになされる。このとき、トランジスタ１２の増幅
作用によシ、異常発振よりも発振条件のすぐれている水
晶振動子ＪＪの振動が成長され正常々発振出力を得るこ
とができるようになるものである。In addition, the coil 23, the capacitor Cm, and the stray capacitance Cs
When the abnormal oscillation due to the series resonant frequency with the parallel combined capacitor grows and its level becomes high, the abnormal oscillation level is suppressed by the action of the diode 250 before the transistor z2 is forced into the cut-off state, causing intermittent oscillation etc. It will be done so that there is no such thing. At this time, due to the amplification effect of the transistor 12, the vibration of the crystal resonator JJ, which has better oscillation conditions than the abnormal oscillation, grows, and a normal oscillation output can be obtained.
なお、この発明は上記実施例に限定されろく）のではな
く、この外その要旨を逸脱し々い範囲で種々変形して実
施することができる。Note that the present invention is not limited to the above-mentioned embodiments, but can be implemented with various modifications without departing from the gist thereof.
１、たがって、以上詳述したようにこの発明によれば、
水晶振動子とトランジスタの制御電極との間に介在され
たインダクタンス素子の補正効果を損なうこと々く、発
振を円滑に起動１−異常発振を防止し得る極めて良好々
発振回路を提供することができる。1. Therefore, according to the present invention as detailed above,
It is possible to provide an extremely successful oscillation circuit that can smoothly start oscillation without impairing the correction effect of the inductance element interposed between the crystal resonator and the control electrode of the transistor. .
第１図は従来の発振回路を示す回路構成図、第２図及び
第３図はそれぞれ従来の発振回路の問題点を説明するた
めの等価回路図及び特性図、第４図はこの発明に係る発
振回路の一実施例を示す回路構成図である。
ＩＩ・・・水晶振動子、１２・・・トランジスタ、 。
１３・・・コンデンサ、１４・・・コイル、１５・・・
タンク回路、１６．１７・・・コンデンサ、１８・・・
ｉ抗、Ｉ９・・・デカツブ回路、２０・・・コンデンサ
、２１・・・出力端子、２２・・・バイアス抵抗、２３
・・・コイル、２４・・・抵抗、２５・・・ダイオード
。
出願人代理人 弁理士 鈴 江 武 彦第１図
第２図 第３閃FIG. 1 is a circuit configuration diagram showing a conventional oscillation circuit, FIGS. 2 and 3 are an equivalent circuit diagram and characteristic diagram for explaining the problems of the conventional oscillation circuit, respectively, and FIG. 4 is a circuit diagram according to the present invention. FIG. 1 is a circuit configuration diagram showing an example of an oscillation circuit. II...Crystal resonator, 12...Transistor. 13... Capacitor, 14... Coil, 15...
Tank circuit, 16.17... Capacitor, 18...
i resistor, I9...dekatubu circuit, 20...capacitor, 21...output terminal, 22...bias resistor, 23
...Coil, 24...Resistor, 25...Diode. Applicant's agent Patent attorney Takehiko Suzue Figure 1 Figure 2 Figure 3 Flash
Claims (1)
水晶振動子の他端が一 端に接続されたインダクタンス素子と、このインダクタ
ンス素子の他端が制御電極に接続され第１の被制御電極
が電源端に接続されたトランジスタと、このトランジス
タの第２の被制御電極と前記基準電位点との間に介在さ
れたタンク回路とを備えた発振回路において、前記イン
ダクタンス素子にダイオードを並列接続し、前記インダ
クタンス素子と前記水晶振動子の持つ容量成分及び該水
晶振動子に並列に存在する浮遊容量の合成容量との直列
共振周波数による異常発振を抑制するようにしてなるこ
とを特徴とする発振回路。[Claims] A crystal resonator with one end connected to a reference potential point, an inductance element with the other end of the crystal resonator connected to one end, and the other end of the inductance element connected to a control electrode. In an oscillation circuit comprising a transistor having a first controlled electrode connected to a power supply terminal, and a tank circuit interposed between a second controlled electrode of the transistor and the reference potential point, the inductance element A diode is connected in parallel to suppress abnormal oscillation due to a series resonance frequency of the inductance element, a capacitance component of the crystal resonator, and a combined capacitance of stray capacitance existing in parallel with the crystal resonator. An oscillation circuit featuring:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11931283A JPS6010901A (en) | 1983-06-30 | 1983-06-30 | Oscillating circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11931283A JPS6010901A (en) | 1983-06-30 | 1983-06-30 | Oscillating circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6010901A true JPS6010901A (en) | 1985-01-21 |
Family
ID=14758317
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11931283A Pending JPS6010901A (en) | 1983-06-30 | 1983-06-30 | Oscillating circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6010901A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009239971A (en) * | 2000-07-17 | 2009-10-15 | Epson Toyocom Corp | Piezoelectric oscillator |
| JP2010193208A (en) * | 2009-02-18 | 2010-09-02 | Nippon Dempa Kogyo Co Ltd | Crystal oscillation circuit |
| JP2010536211A (en) * | 2007-08-06 | 2010-11-25 | ステ エッセ・ア・エッセ ディ ジ・モイラーギ アンド チ． | Operating circuit for surface wave resonance circuit and oscillation circuit using the same |
-
1983
- 1983-06-30 JP JP11931283A patent/JPS6010901A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009239971A (en) * | 2000-07-17 | 2009-10-15 | Epson Toyocom Corp | Piezoelectric oscillator |
| JP2010536211A (en) * | 2007-08-06 | 2010-11-25 | ステ エッセ・ア・エッセ ディ ジ・モイラーギ アンド チ． | Operating circuit for surface wave resonance circuit and oscillation circuit using the same |
| JP2010193208A (en) * | 2009-02-18 | 2010-09-02 | Nippon Dempa Kogyo Co Ltd | Crystal oscillation circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| KR960016733B1 (en) | Oscillation circuit | |
| EP0535883B1 (en) | Voltage controlled oscillator employing negative resistance | |
| CA1129019A (en) | Crystal controlled oscillators | |
| KR20000069168A (en) | Oscillator | |
| US4590443A (en) | Transistor oscillator with compensating circuit for variable collector-base capacitance | |
| JPS6010901A (en) | Oscillating circuit | |
| JP3001284B2 (en) | Voltage controlled oscillation system | |
| JP3322791B2 (en) | Colpitts oscillation circuit | |
| US4888566A (en) | Temperature compensated stable duty cycle crystal oscillator apparatus | |
| US4224580A (en) | Quartz crystal oscillator | |
| US4107625A (en) | Transistor crystal oscillator which may be paired for generating a beat frequency | |
| JP2553281B2 (en) | Oscillation circuit with crystal oscillator | |
| KR910001649B1 (en) | Local oscillator | |
| US3852686A (en) | Automatic frequency control circuit | |
| JPH04134913A (en) | Crystal oscillator | |
| JP2969639B2 (en) | Radio selective call receiver | |
| JP2576193B2 (en) | Oscillation circuit | |
| EP1432116B1 (en) | Oscillation circuit for television tuner | |
| US7205856B2 (en) | Piezoelectric oscillator | |
| JP2903934B2 (en) | Oscillator circuit and BS tuner using this oscillator circuit | |
| JPH056363B2 (en) | ||
| KR900010618Y1 (en) | Local oscillator output stabilizing circuit of electronic tuner | |
| JPH0648972Y2 (en) | Local oscillator circuit | |
| JPH02179105A (en) | Oscillation circuit | |
| KR100354965B1 (en) | A PLL module |