JPH0370202A - Piezoelectric oscillator - Google Patents
Piezoelectric oscillatorInfo
- Publication number
- JPH0370202A JPH0370202A JP20586589A JP20586589A JPH0370202A JP H0370202 A JPH0370202 A JP H0370202A JP 20586589 A JP20586589 A JP 20586589A JP 20586589 A JP20586589 A JP 20586589A JP H0370202 A JPH0370202 A JP H0370202A
- Authority
- JP
- Japan
- Prior art keywords
- current
- control circuit
- coil
- piezoelectric oscillator
- varactor diode
- 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
- 230000003321 amplification Effects 0.000 claims description 5
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 5
- 230000006866 deterioration Effects 0.000 abstract description 3
- 230000007423 decrease Effects 0.000 abstract description 2
- 230000003247 decreasing effect Effects 0.000 abstract 1
- 230000010355 oscillation Effects 0.000 description 14
- 239000003990 capacitor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000000694 effects Effects 0.000 description 3
- 230000007613 environmental effect Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 230000035945 sensitivity Effects 0.000 description 1
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
Description
【発明の詳細な説明】
［産業上の利用分野コ
本発明は、増幅素子と圧電素子を含む圧電発振器に関し
、特に、可変容量ダイオードを使用しないで発振周波数
を変化することができる圧電発振器に間する。Detailed Description of the Invention [Field of Industrial Application] The present invention relates to a piezoelectric oscillator including an amplification element and a piezoelectric element, and in particular to a piezoelectric oscillator whose oscillation frequency can be changed without using a variable capacitance diode. do.
［従来の技術］ 従来のこの種の圧電発振器を、第５図に示す。[Conventional technology] A conventional piezoelectric oscillator of this type is shown in FIG.
従来の圧電発振器は、圧電素子１、コンデンサ２及び３
、増幅素子４、抵抗５．６及び７、伸長コイル８並びに
可変容量ダイオード１１を図のように接続し、可変容量
ダイオード１１に接続された電圧制御回路１０の電圧制
御で容量を変え、周波数を変化させていた。A conventional piezoelectric oscillator includes a piezoelectric element 1, capacitors 2 and 3
, the amplification element 4, the resistors 5, 6 and 7, the extension coil 8, and the variable capacitance diode 11 are connected as shown in the figure, and the capacitance is changed by voltage control of the voltage control circuit 10 connected to the variable capacitance diode 11, and the frequency is changed. It was changing.
［発明が解決しようとする課題］
上述した従来の圧電発振器は、可変容量ダイオード１１
に印加される電圧に対して静電容量、伸長コイル８のイ
ンダクタンス値及び圧電素子１の共振周波数にばらつき
があり、このため発振周波数のばらつきが大きかった。[Problem to be solved by the invention] The conventional piezoelectric oscillator described above has a variable capacitance diode 11
There were variations in the capacitance, the inductance value of the elongated coil 8, and the resonance frequency of the piezoelectric element 1 with respect to the voltage applied to the oscillation frequency.
従って、発振周波数を一定範囲に納めるには、可変容量
ダイオード１１の素子感度を高くしなければならなかっ
た。しかるに、可変容量ダイオード１１は環境温度によ
ってその特性が変化するため、発振周波数も温度の変化
に従って悪化するという欠点があった。Therefore, in order to keep the oscillation frequency within a certain range, it is necessary to increase the element sensitivity of the variable capacitance diode 11. However, since the characteristics of the variable capacitance diode 11 change depending on the environmental temperature, the oscillation frequency also deteriorates as the temperature changes.
尚、伸長コイル８や可変容量ダイオード１１を選別する
等により発振周波数を一定範囲に納めるという方法もあ
るが、選別に多大な工数を有するという新たな欠点があ
った。Although there is a method of keeping the oscillation frequency within a certain range by selecting the elongated coil 8 or the variable capacitance diode 11, there is a new drawback that the selection requires a large amount of man-hours.
［課題を解決するための手段］
本発明の目的は、上述した従来技術の課題を解決し、可
変容量ダイオードを使用しないで発振周波数を変化する
ことができる圧電発振器を提供することである。[Means for Solving the Problems] An object of the present invention is to solve the problems of the prior art described above and to provide a piezoelectric oscillator that can change the oscillation frequency without using a variable capacitance diode.
本発明は、増幅素子と圧電素子を含む圧電発振器におい
て、圧電素子に直列に接続された伸長コイルと、伸長コ
イルに制御電流を供給する電流制御回路とを有すること
を特徴とする。The present invention is a piezoelectric oscillator that includes an amplification element and a piezoelectric element, and is characterized by having an extension coil connected in series to the piezoelectric element, and a current control circuit that supplies a control current to the extension coil.
［実施例］ 本発明の圧電発振器について図面を参照して説明する。[Example] A piezoelectric oscillator according to the present invention will be explained with reference to the drawings.
第１図は、本発明に係る圧電発振器の一実施例の回路図
である。FIG. 1 is a circuit diagram of an embodiment of a piezoelectric oscillator according to the present invention.
本発明の圧電発振器は、圧電素子１（発振子）、コンデ
ンサ２及び３、増幅素子４、抵抗５並びに伸長コイル８
を図のように接続して構成されている０本発明の特徴は
、電圧制御回路及び可変容量ダイオードを使用する代わ
りに電流制御口Ｆ＃Ｉ９を使用し、その出力を抵抗６及
び７を介して制＃電流として伸長コイル８に供給する点
である。The piezoelectric oscillator of the present invention includes a piezoelectric element 1 (oscillator), capacitors 2 and 3, an amplifying element 4, a resistor 5, and an extension coil 8.
The feature of the present invention is that instead of using a voltage control circuit and a variable capacitance diode, a current control port F#I9 is used, and its output is connected through resistors 6 and 7. This is the point where the current is supplied to the extension coil 8 as a control current.
次に、本発明の圧電発振器の動作について説明する。Next, the operation of the piezoelectric oscillator of the present invention will be explained.
伸長コイルのインダクタンス値と発振周波数の関係を第
２図に示す０図示されているように、伸長コイル８のイ
ンダクタンスは、それが増大すると発振周波数はそれに
反比例して減少する特性を有している。The relationship between the inductance value of the elongated coil and the oscillation frequency is shown in Fig. 2. As shown in Figure 2, the inductance of the elongated coil 8 has a characteristic that as it increases, the oscillation frequency decreases in inverse proportion to it. .
一方、伸長コイル８のインダクタンスは、直流重畳電流
値によって変化することが一般に知られている。On the other hand, it is generally known that the inductance of the extension coil 8 changes depending on the DC superimposed current value.
そこで、伸長コイル８に電流制御回路９より制Ｗ電流を
供給すると、第３図のごとき特性が得られる。従って、
第２図及び第３図より明らかなように、電流制御回路９
より供給される制御電流によって、第４図のごとき周波
数特性が得られることになる。Therefore, when a current controlling current is supplied to the extension coil 8 from the current control circuit 9, a characteristic as shown in FIG. 3 is obtained. Therefore,
As is clear from FIGS. 2 and 3, the current control circuit 9
The frequency characteristics shown in FIG. 4 are obtained by the control current supplied by the control current.
つまり、可変容量ダイオードを用いないで発振周波数を
可変できることになる。In other words, the oscillation frequency can be varied without using a variable capacitance diode.
［発明の効果］
以上説明したように、本発明は、可変容量ダイオードを
用いないため発振周波数のばらつきがなくなり、従って
、従来問題となっていた可変容量ダイオードの温度特性
による発振周波数の温度特性の悪化もなくなる。又、コ
イルのインダクタンス値のばらつきを含んで調整できる
ため、発振周波数を一定範囲に納めやすいという効果が
ある。[Effects of the Invention] As explained above, the present invention eliminates variations in oscillation frequency because it does not use a variable capacitance diode, and therefore solves the problem of the temperature characteristic of the oscillation frequency due to the temperature characteristic of the variable capacitance diode, which has been a problem in the past. There will be no more deterioration. Further, since it can be adjusted to include variations in the inductance value of the coil, there is an effect that the oscillation frequency can be easily kept within a certain range.
さらに、可変容量ダイオードを使用しないため部品数も
減り、電流制御回路をＩＣ化することにより、小型化も
可能になるという効果もある。Furthermore, since no variable capacitance diode is used, the number of components is reduced, and by incorporating the current control circuit into an IC, there is also the effect that miniaturization becomes possible.
第１図は、本発明に係る圧電発振器の一実施例の回路図
である。
第２図は、伸長コイルのインダクタンス値と発振周波数
との関係を示すグラフである。
第３図は、電流制御回路より供給される制御電流と伸長
コイルのインダクタンス値との関係を示すグラフである
。
第４図は、電流制御回路より供給される制御電流と発振
周波数との関係を示すグラフである。
第５図は、従来の圧電発振器の回路図である。
１・・・圧！発振器 ２．３・・・コンデンサ４・・
・増幅素子 ５．６．７・・・抵抗器８・・・伸長
コイル ９・・・電流制御回路１０・・・圧電制御回
路
１１・・・可変容量ダイオードFIG. 1 is a circuit diagram of an embodiment of a piezoelectric oscillator according to the present invention. FIG. 2 is a graph showing the relationship between the inductance value of the extension coil and the oscillation frequency. FIG. 3 is a graph showing the relationship between the control current supplied from the current control circuit and the inductance value of the extension coil. FIG. 4 is a graph showing the relationship between the control current supplied from the current control circuit and the oscillation frequency. FIG. 5 is a circuit diagram of a conventional piezoelectric oscillator. 1...Pressure! Oscillator 2.3... Capacitor 4...
・Amplification element 5.6.7...Resistor 8...Extension coil 9...Current control circuit 10...Piezoelectric control circuit 11...Variable capacitance diode
Claims (1)
子に直列に接続された伸長コイルと、前記伸長コイルに
制御電流を供給する電流制御回路と、 を有することを特徴とする圧電発振器。[Claims] A piezoelectric oscillator including an amplification element and a piezoelectric element, characterized by comprising: an extension coil connected in series to the piezoelectric element, and a current control circuit that supplies a control current to the extension coil. Piezoelectric oscillator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20586589A JPH0370202A (en) | 1989-08-09 | 1989-08-09 | Piezoelectric oscillator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP20586589A JPH0370202A (en) | 1989-08-09 | 1989-08-09 | Piezoelectric oscillator |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0370202A true JPH0370202A (en) | 1991-03-26 |
Family
ID=16514003
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP20586589A Pending JPH0370202A (en) | 1989-08-09 | 1989-08-09 | Piezoelectric oscillator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0370202A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6760575B2 (en) | 1998-05-29 | 2004-07-06 | Silicon Laboratories, Inc. | Method and apparatus for generating a variable capacitance for synthesizing high-frequency signals for wireless communications |
| US6965761B2 (en) | 1998-05-29 | 2005-11-15 | Silicon Laboratories, Inc. | Controlled oscillator circuitry for synthesizing high-frequency signals and associated method |
| US6993307B2 (en) | 1998-05-29 | 2006-01-31 | Silicon Laboratories, Inc. | Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications |
-
1989
- 1989-08-09 JP JP20586589A patent/JPH0370202A/en active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6760575B2 (en) | 1998-05-29 | 2004-07-06 | Silicon Laboratories, Inc. | Method and apparatus for generating a variable capacitance for synthesizing high-frequency signals for wireless communications |
| US6965761B2 (en) | 1998-05-29 | 2005-11-15 | Silicon Laboratories, Inc. | Controlled oscillator circuitry for synthesizing high-frequency signals and associated method |
| US6993307B2 (en) | 1998-05-29 | 2006-01-31 | Silicon Laboratories, Inc. | Method and apparatus for operating a PLL with a phase detector/sample hold circuit for synthesizing high-frequency signals for wireless communications |
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