JPH0365043B2 - - Google Patents
Info
- Publication number
- JPH0365043B2 JPH0365043B2 JP57152905A JP15290582A JPH0365043B2 JP H0365043 B2 JPH0365043 B2 JP H0365043B2 JP 57152905 A JP57152905 A JP 57152905A JP 15290582 A JP15290582 A JP 15290582A JP H0365043 B2 JPH0365043 B2 JP H0365043B2
- Authority
- JP
- Japan
- Prior art keywords
- capacitors
- oscillation
- oscillation frequency
- capacitor
- capacitance values
- 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 - Lifetime
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
- H03B5/30—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
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Description
【発明の詳細な説明】
［産業上の利用分野］
本発明は、CMOSインバータを使用した水晶
発振回路の発振周波数調整法に関するものであ
る。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a method for adjusting the oscillation frequency of a crystal oscillation circuit using a CMOS inverter.
［従来の技術とその問題点］
従来より水晶発振回路は、第１図のように、水
晶振動子Q1、抵抗R1、CMOSインバータV1、入
力側トリマコンデンサC1、出力側トリマコンデ
ンサC2より構成されている。そして入力側トリ
マコンデンサC1の電気容量を調整することによ
り所望の発振周波数に設定している。[Conventional technology and its problems] Conventionally, a crystal oscillation circuit has a crystal resonator Q 1 , a resistor R 1 , a CMOS inverter V 1 , an input side trimmer capacitor C 1 , and an output side trimmer capacitor C as shown in Figure 1. It is composed of 2 . A desired oscillation frequency is set by adjusting the capacitance of the input side trimmer capacitor C1 .
固定の出力側コンデンサC2の電気容量を5PF、
20PFとし、入力側トリマコンデンサC1を５〜
20PFの範囲で調整したときの発振開始電圧VDDを
第２図に、動作消費電流IDDを第３図に示してい
る。同図から明白なように発振開始電圧VDDは両
コンデンサの容量値の差が大きいときに高く、動
作消費電流IDDは両コンデンサの容量値の差が大
きいときに大きくなつている。これは、入力側ト
リマコンデンサC1と出力側コンデンサC2との容
量値の差が大きくなると、水晶発振回路の発振特
性が低下することを意味している。 The capacitance of the fixed output capacitor C2 is 5PF,
20PF, input side trimmer capacitor C1 is 5~
Figure 2 shows the oscillation start voltage V DD when adjusted within the range of 20PF, and Figure 3 shows the operating current consumption I DD . As is clear from the figure, the oscillation start voltage V DD is high when the difference between the capacitance values of both capacitors is large, and the operating current consumption I DD is high when the difference between the capacitance values of both capacitors is large. This means that as the difference in capacitance between the input side trimmer capacitor C 1 and the output side capacitor C 2 increases, the oscillation characteristics of the crystal oscillation circuit deteriorate.
［発明の目的］
そこで本発明は、発振開始電圧を低くかつ動作
消費電流を小さく保つことができる新規な発振周
波数調整法を提供することを目的とする。[Object of the Invention] Therefore, an object of the present invention is to provide a novel oscillation frequency adjustment method that can keep the oscillation start voltage low and the operating current consumption small.
［目的を達成するための手段］
上記目的を達成するために、本発明では、水晶
振動子、その発振制御用駆動回路、この駆動回路
に対する入力側コンデンサおよび出力側コンデン
サとを有する水晶発振回路において、両コンデン
サを初期容量値が実質的に等しいトリマコンデン
サとし、この両コンデンサの容量値を共に等しい
状態に保ちつつ両コンデンサを同時に変化させて
発振周波数を調整するようにした。[Means for Achieving the Object] In order to achieve the above object, the present invention provides a crystal oscillator circuit having a crystal resonator, a drive circuit for controlling its oscillation, and an input capacitor and an output capacitor for the drive circuit. Both capacitors are trimmer capacitors with substantially equal initial capacitance values, and the oscillation frequency is adjusted by changing both capacitors simultaneously while keeping the capacitance values of both capacitors equal.
［実施例］
以下、本発明の詳細を実施例にそつて説明す
る。[Examples] Hereinafter, details of the present invention will be explained with reference to Examples.
第４図において、Ｑは水晶振動子、Ｒは抵抗、
Ｖは駆動回路（CMOSインバータ）、C3およびC4
はそれぞれ入力側トリマコンデンサおよび出力側
トリマコンデンサである。これらは図示のように
接続されて水晶発振回路を構成している。 In Figure 4, Q is a crystal oscillator, R is a resistance,
V is the drive circuit (CMOS inverter), C 3 and C 4
are the input side trimmer capacitor and the output side trimmer capacitor, respectively. These are connected as shown to constitute a crystal oscillation circuit.
両コンデンサC3，C4は、初期容量値が実質的
に等しいコンデンサであり、容量値を共に等しい
状態に保ちつつ両コンデンサを同時に同量ずつ変
化させて発振周波数が調整される。 Both capacitors C 3 and C 4 have substantially equal initial capacitance values, and the oscillation frequency is adjusted by simultaneously changing both capacitors by the same amount while keeping the capacitance values equal.
第７図および第８図はこのようにして発振周波
数を調整した場合の発振開始電圧VDDおよび動作
消費電流IDDを示している。同図より明らかなよ
うに発振開始電圧VDDは低く、動作消費電流IDDは
小さくなつている。このように負荷容量を調整し
て発振周波数を調整しても発振回路は発振特性の
よい発振を継続する。 FIGS. 7 and 8 show the oscillation start voltage V DD and the operating current consumption I DD when the oscillation frequency is adjusted in this manner. As is clear from the figure, the oscillation start voltage V DD is low and the operating current consumption I DD is small. Even if the oscillation frequency is adjusted by adjusting the load capacitance in this manner, the oscillation circuit continues to oscillate with good oscillation characteristics.
上記したような、初期容量値が実質的に等しい
二つのコンデンサを同時に同量ずつ変化させるた
めには、以下ようなトリマコンデンサとするのが
好適である。 In order to simultaneously change two capacitors having substantially the same initial capacitance value by the same amount as described above, it is preferable to use the following trimmer capacitor.
第５図および第６図において、アルミナなどか
らなる絶縁基板１の上面には下部電極２，３が形
成してあり、その上部に誘電体層４が形成され、
さらに誘電体層４の上部には上部電極５が形成さ
れている。６，７はそれぞれ端子電極であり、端
子電極６は下部電極２，３と、端子電極７は下部
電極５と接続されている。そして入力側トリマコ
ンデンサC3は下部電極２と上部電極５とこれら
の電極の間の誘電体層４とから構成され、出力側
トリマコンデンサC4は下部電極３と上部電極５
とこれらの電極の間の誘電体層４とから構成され
る。入力側トリマコンデンサC3および出力側ト
リマコンデンサC4は、下部電極２，３と上部電
極５との対向面積が等しく、容量値が等しく設定
してある。 In FIGS. 5 and 6, lower electrodes 2 and 3 are formed on the upper surface of an insulating substrate 1 made of alumina or the like, and a dielectric layer 4 is formed on top of the lower electrodes 2 and 3.
Further, an upper electrode 5 is formed on the dielectric layer 4 . 6 and 7 are terminal electrodes, respectively, and the terminal electrode 6 is connected to the lower electrodes 2 and 3, and the terminal electrode 7 is connected to the lower electrode 5. The input trimmer capacitor C3 is composed of a lower electrode 2, an upper electrode 5, and a dielectric layer 4 between these electrodes, and the output trimmer capacitor C4 is composed of a lower electrode 3 and an upper electrode 5.
and a dielectric layer 4 between these electrodes. In the input-side trimmer capacitor C 3 and the output-side trimmer capacitor C 4 , the lower electrodes 2 and 3 and the upper electrode 5 have the same opposing area and are set to have the same capacitance value.
そこで、第５図二点鎖線に示すようにレーザ光
線、サンドブラスト法などにより上部電極５を切
断する。この切断は上部電極５の端部よりその延
伸方向と直角に切つていくため、入力側トリマコ
ンデンサC3および出力側トリマコンデンサC4は
共にその容量値が等しく減少することになる。 Therefore, the upper electrode 5 is cut using a laser beam, sandblasting, or the like, as shown by the two-dot chain line in FIG. Since this cutting is performed from the end of the upper electrode 5 at right angles to its extending direction, the capacitance values of both the input side trimmer capacitor C 3 and the output side trimmer capacitor C 4 are equally reduced.
なお入力側トリマコンデンサC3と出力側トリ
マコンデンサC4の容量値は厳密に等しいことを
要とするのではなく、両者に若干の誤差があつて
もよいことは言うまでもないことである。 It goes without saying that the capacitance values of the input-side trimmer capacitor C 3 and the output-side trimmer capacitor C 4 do not have to be strictly equal, and that there may be a slight error between the two.
［発明の効果］
以上詳細に説明したように本発明によれば、発
振回路における入力側と出力側の二つのコンデン
サを初期容量値が実質的に等しいトリマコンデン
サとし、この両コンデンサの容量値を共に等しい
状態に保ちつつ上記両コンデンサを同時に変化さ
せて発振周波数を調整するようにしたから、水晶
発振回路の発振開始電圧を高くせず、なおかつ動
作消費電流を大きくしないで発振周波数を所望の
値に調整することができ、したがつて発振特性の
優れた発振を保つことができる。[Effects of the Invention] As explained in detail above, according to the present invention, the two capacitors on the input side and the output side of the oscillation circuit are trimmer capacitors with substantially equal initial capacitance values, and the capacitance values of both capacitors are Since the oscillation frequency is adjusted by changing both capacitors simultaneously while keeping both capacitors in the same state, the oscillation frequency can be adjusted to the desired value without increasing the oscillation start voltage of the crystal oscillation circuit and without increasing the operating current consumption. Therefore, it is possible to maintain excellent oscillation characteristics.
第１図は従来の水晶発振回路図、第２図はその
負荷容量と発振開始電圧との関係図、第３図はそ
の負荷容量と動作消費電流との関係図、第４図は
本発明が適用された水晶発振回路図、第５図は入
力側および出力側のトリマコンデンサの一実施例
の正面図、第６図は第５図−線断面図、第７
図は本発明方法で調整したときの負荷容量と発振
開始電圧との関係図、第８図は本発明方法で調整
したときの負荷容量と動作消費電流との関係図で
ある。
Ｑ……水晶振動子、Ｒ……抵抗、Ｖ……駆動回
路（CMOSインバータ）、C3……入力側コンデン
サ、C4……出力側コンデンサ。
Figure 1 is a diagram of a conventional crystal oscillation circuit, Figure 2 is a diagram of the relationship between its load capacitance and oscillation start voltage, Figure 3 is a diagram of its relationship between load capacity and operating current consumption, and Figure 4 is a diagram of the conventional crystal oscillation circuit. A diagram of the applied crystal oscillation circuit, FIG. 5 is a front view of an embodiment of trimmer capacitors on the input side and output side, FIG. 6 is a sectional view taken along the line of FIG. 5, and FIG.
FIG. 8 is a diagram showing the relationship between load capacitance and oscillation start voltage when adjusted by the method of the present invention, and FIG. 8 is a diagram showing the relationship between load capacitance and operating current consumption when adjusted by the method of the present invention. Q...Crystal resonator, R...Resistor, V...Drive circuit (CMOS inverter), C3 ...Input side capacitor, C4 ...Output side capacitor.
Claims (1)
バータと抵抗とからなる並列回路と、この並列回
路に対する入力側コンデンサと出力側コンデンサ
とで構成されるCMOSインバータ式水晶発振回
路の発振周波数調整法において、 上記両コンデンサを初期容量値が実質的に等し
いトリマコンデンサとし、この両コンデンサの容
量値を共に等しい状態に保ちつつ上記両コンデン
サを同時に変化させて発振周波数を調整する ことを特徴とするCMOSインバータ式水晶発振
回路の発振周波数調整法。[Claims] 1. A CMOS inverter type crystal oscillation circuit consisting of a parallel circuit consisting of a crystal resonator, a CMOS inverter for controlling its oscillation, and a resistor, and an input side capacitor and an output side capacitor for this parallel circuit. In the oscillation frequency adjustment method, both capacitors are trimmer capacitors with substantially equal initial capacitance values, and the oscillation frequency is adjusted by changing both capacitors simultaneously while keeping the capacitance values of both capacitors equal. Features a method for adjusting the oscillation frequency of a CMOS inverter type crystal oscillator circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15290582A JPS5941906A (en) | 1982-09-02 | 1982-09-02 | Adjusting method of oscillation frequency of crystal oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP15290582A JPS5941906A (en) | 1982-09-02 | 1982-09-02 | Adjusting method of oscillation frequency of crystal oscillator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5941906A JPS5941906A (en) | 1984-03-08 |
| JPH0365043B2 true JPH0365043B2 (en) | 1991-10-09 |
Family
ID=15550694
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP15290582A Granted JPS5941906A (en) | 1982-09-02 | 1982-09-02 | Adjusting method of oscillation frequency of crystal oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5941906A (en) |
Families Citing this family (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH04302644A (en) * | 1991-03-27 | 1992-10-26 | Misawa Homes Co Ltd | Roof panel |
| JP5346110B2 (en) * | 2012-07-12 | 2013-11-20 | 旭化成エレクトロニクス株式会社 | Sensor oscillator |
Family Cites Families (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS5348776A (en) * | 1976-10-16 | 1978-05-02 | Citizen Watch Co Ltd | Electronic watch |
| JPS6233303Y2 (en) * | 1980-04-10 | 1987-08-26 |
-
1982
- 1982-09-02 JP JP15290582A patent/JPS5941906A/en active Granted
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5941906A (en) | 1984-03-08 |
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