JPS5916221B2 - Resonant circuit of piezoelectric vibrator - Google Patents
Resonant circuit of piezoelectric vibratorInfo
- Publication number
- JPS5916221B2 JPS5916221B2 JP54104437A JP10443779A JPS5916221B2 JP S5916221 B2 JPS5916221 B2 JP S5916221B2 JP 54104437 A JP54104437 A JP 54104437A JP 10443779 A JP10443779 A JP 10443779A JP S5916221 B2 JPS5916221 B2 JP S5916221B2
- Authority
- JP
- Japan
- Prior art keywords
- phase
- circuit
- locked closed
- frequency
- piezoelectric vibrator
- 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
Links
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Description
【発明の詳細な説明】
本発明は等価回路定数などを測定するための圧電振動子
の共振回路に関するものである。DETAILED DESCRIPTION OF THE INVENTION The present invention relates to a piezoelectric vibrator resonant circuit for measuring equivalent circuit constants and the like.
従来、例えば水晶振動子の直列共振周波数および共振イ
ンピーダンスなどを測定する方法として、いわゆるトラ
ンスミッション法というものがある。Conventionally, there is a so-called transmission method as a method for measuring, for example, the series resonant frequency and resonant impedance of a crystal resonator.
これは、可変発振器と検波器を用いたもので、発振器の
周波数を徐々に変化していつて水晶振動子を共振させ、
その周波数および抵抗分を測定するものである。これに
よると発振器の周波数を変化させるのに、つまみを回す
等の操作が必要であり、また検波器のふれの最大値を読
み取つて共振点を検出するなど人手に依るところが大き
かつた。またこの他に発振法によるＣＩメータというも
のがあるが、これは水晶振動子の励振レベルが約１ｍｗ
と高く、一方例えばＣ−ＭＯＳ集積回路を用いた水晶発
振器ではその励振レベルが１μＷ以下と低いため、その
励振レベルにおける等価回路定数を測定できないという
難点があつた。そこで本発明は人手を要せず、しかも低
い励振レベルでも圧電振動子を共振できるようにし、従
来の欠点を除去するものである。This uses a variable oscillator and a detector, and the frequency of the oscillator is gradually changed to cause the crystal oscillator to resonate.
The frequency and resistance are measured. According to this, in order to change the frequency of the oscillator, operations such as turning a knob were required, and the detection of the resonance point by reading the maximum value of the vibration of the detector was highly dependent on human hands. There is also a CI meter that uses the oscillation method, but this uses a crystal resonator with an excitation level of approximately 1mW.
On the other hand, for example, in a crystal oscillator using a C-MOS integrated circuit, the excitation level is as low as 1 .mu.W or less, so there is a problem in that the equivalent circuit constant at that excitation level cannot be measured. Therefore, the present invention eliminates the drawbacks of the conventional piezoelectric vibrator by making it possible to resonate a piezoelectric vibrator even at a low excitation level without requiring manual labor.
以下本発明の一実施例を図面に基づいて説明する。An embodiment of the present invention will be described below based on the drawings.
Ｐ１、Ｐ２はそれぞれ第１および第２の位相固定閉回路
であり、位相比較器、低減ろ波回路、増幅回路および電
圧制御発振器からなるいわゆるＰＬＬ（フエイズロツク
ドループ）である。Ｆは周波数変調回路、Ａ１、Ａ２は
増幅回路、ＧはＡＧＣ（自動利得制御）回路である。Ｄ
は検波器、Ｍはメータである。Ｑは水晶振動子、Ｒ１
、Ｒ２は数１０Ωの抵抗である。以上の構成において、
電源を投入すると位相固定閉回路Ｐ１、Ｐ２は自走発振
を行なうが、位相固定閉回路Ｐ２の出力には、変調回路
Ｆによつて周波数変調が行なわれる。P1 and P2 are first and second phase locked closed circuits, respectively, which are so-called PLLs (phase locked loops) consisting of a phase comparator, a reduction filter circuit, an amplifier circuit and a voltage controlled oscillator. F is a frequency modulation circuit, A1 and A2 are amplifier circuits, and G is an AGC (automatic gain control) circuit. D
is a detector, and M is a meter. Q is a crystal oscillator, R1
, R2 is a resistance of several tens of ohms. In the above configuration,
When the power is turned on, the phase-locked closed circuits P1 and P2 perform free-running oscillation, but the modulation circuit F performs frequency modulation on the output of the phase-locked closed circuit P2.
この周波数変調は、水晶振動子Ｑの共振周波数を含む範
囲内で行なわれる。位相固定閉回路Ｐ２の周波数出力は
位相固定閉回路Ｐ１に供給され、その出力周波数は入力
周波数に追従して変化し、増幅器Ａ、を介して水晶振動
子Ｑに供給される。そこで上記変調周波数が水晶振動子
Ｑの共振周波数と一致すると、水晶振動子Ｑが共振し、
その共振周波数が位相固定閉回路Ｐ２に供給される。そ
のため位相固定閉回路Ｐ２は上記共振周波数に固定され
、位相固定閉回路Ｐ、も上記共振周波数に固定され、水
晶振動子Ｑは共振状態に保持される。ところで上記のよ
うに周波数変調を行なつたのは、水晶振動子Ｑが共振点
に到達する時間を短縮するためで、これによるとほとん
ど瞬間的に共振点に到達するものである。This frequency modulation is performed within a range that includes the resonant frequency of the crystal resonator Q. The frequency output of the phase-locked closed circuit P2 is supplied to the phase-locked closed circuit P1, whose output frequency changes in accordance with the input frequency, and is supplied to the crystal resonator Q via the amplifier A. Therefore, when the above modulation frequency matches the resonant frequency of the crystal oscillator Q, the crystal oscillator Q resonates,
The resonant frequency is supplied to the phase-locked closed circuit P2. Therefore, the phase-locked closed circuit P2 is fixed at the above-mentioned resonant frequency, the phase-locked closed circuit P is also fixed at the above-mentioned resonant frequency, and the crystal resonator Q is held in a resonant state. By the way, the reason why the frequency modulation is performed as described above is to shorten the time it takes for the crystal resonator Q to reach the resonance point, and according to this method, the resonance point is reached almost instantaneously.
因みに、周波数変調を行なわないと、共振点に達するま
でに１秒程度の時間がかかる。なお水晶振動子Ｑの抵抗
分ｒは、端子Ａ，ｂの電圧Ｖａ，Ｖｂと抵抗Ｒ２によつ
て、と表わされる。Incidentally, if frequency modulation is not performed, it will take about 1 second to reach the resonance point. Note that the resistance r of the crystal resonator Q is expressed by the voltages Va and Vb of the terminals A and b and the resistor R2.
したがつて、端子ａの電圧ＶａをＡＧＣ回路Ｇによつて
一定の値になるように設定しておき、端子ｂの電圧Ｖｂ
を検出することにより抵抗ｒを測定できるものである。Therefore, the voltage Va at terminal a is set to a constant value by the AGC circuit G, and the voltage Va at terminal b is set to a constant value.
By detecting this, the resistance r can be measured.
ところで位相固定閉回路を一つ除去して一つの位相固定
閉回路だけで測定を行なうことも考えられる。この場合
、水晶振動子Ｑの出力レベルの変動分を補償するために
水晶振動子Ｑの出力側に増幅回路を設ける必要がある。
しかしながら単に増幅回路を用いたのでは、周波数の変
動によつてその入出力の位相差が変動してしまい、この
位相差が全体の振動系に伝達され上記測定結果に誤差を
生じてしまうのである。ぞこで、入出力の位相差が固定
されている位相固定閉回路を増幅回路に代えて用いるこ
とによつて、周波数の変動による振動系の位相ずれをな
くし測定精度を向上させるようにしたものである。なお
、上記の実施例では水晶振動子について述べたが、他の
圧電振動子の測定に用いてもよい。By the way, it is also possible to remove one phase-locked closed circuit and perform measurement using only one phase-locked closed circuit. In this case, it is necessary to provide an amplifier circuit on the output side of the crystal oscillator Q in order to compensate for fluctuations in the output level of the crystal oscillator Q.
However, if an amplifier circuit is simply used, the phase difference between its input and output will fluctuate due to frequency fluctuations, and this phase difference will be transmitted to the entire vibration system, causing errors in the above measurement results. . By using a phase-locked closed circuit in which the phase difference between input and output is fixed in place of an amplifier circuit, it is possible to eliminate phase shifts in the vibration system due to frequency fluctuations and improve measurement accuracy. It is. In addition, although the above-mentioned example described a crystal resonator, it may be used for measurement of other piezoelectric resonators.
以上のように本発明によれば、２つの位相固定閉回路を
用い第２の位相固定閉回路の発振器の周波数変調を行な
うようにしたので、圧電振動子の共振を位相ずれなく安
定して保持でき等価回路定数等の測定精度が向上する。
しかも圧電振動子を瞬間的に共振点に到達させることが
でき、測定時間を短縮できるため、多数の圧電振動子の
測定を行なう際に特に有効である。As described above, according to the present invention, since the frequency modulation of the oscillator of the second phase-locked closed circuit is performed using two phase-locked closed circuits, the resonance of the piezoelectric vibrator can be stably maintained without phase shift. This improves the measurement accuracy of equivalent circuit constants, etc.
Furthermore, the piezoelectric vibrator can be brought to the resonance point instantaneously, and the measurement time can be shortened, so it is particularly effective when measuring a large number of piezoelectric vibrators.
図面は本発明の一実施例を示した電気回路図である。
Ｐ１・・・・・・第１の位相固定閉回路、Ｐ２・・・・
・・第２の位相固定閉回路、Ｆ・・・・・・周波数変調
回路、Ｑ・・・・・・水晶振動子。The drawing is an electrical circuit diagram showing an embodiment of the present invention. P1...First phase-locked closed circuit, P2...
...Second phase-locked closed circuit, F...Frequency modulation circuit, Q...Crystal oscillator.
Claims (1)
相比較して上記発振周波数を上記入力周波数に固定する
２つの位相固定閉回路を設け、第１の位相固定閉回路の
出力側と第２の位相固定閉回路の入力側との間に圧電振
動子を接続するとともに第２の位相固定閉回路の出力側
を第１の位相固定閉回路の入力側に接続し、第２の位相
固定閉回路に内蔵された発振器の発振周波数を圧電振動
子の共振周波数を含む範囲内で周波数変調を行なう変調
回路を設けた圧電振動子の共振回路。1. Two phase-locked closed circuits are provided that incorporate an oscillator and compare the phases of the oscillation frequency and the input frequency to fix the oscillation frequency to the input frequency, and the output side of the first phase-locked closed circuit and the second phase-locked closed circuit are provided. A piezoelectric vibrator is connected between the input side of the phase-locked closed circuit, and the output side of the second phase-locked closed circuit is connected to the input side of the first phase-locked closed circuit. A resonant circuit for a piezoelectric vibrator equipped with a modulation circuit that modulates the oscillation frequency of the built-in oscillator within a range that includes the resonant frequency of the piezoelectric vibrator.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54104437A JPS5916221B2 (en) | 1979-08-16 | 1979-08-16 | Resonant circuit of piezoelectric vibrator |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP54104437A JPS5916221B2 (en) | 1979-08-16 | 1979-08-16 | Resonant circuit of piezoelectric vibrator |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| JPS5627665A JPS5627665A (en) | 1981-03-18 |
| JPS5916221B2 true JPS5916221B2 (en) | 1984-04-13 |
Family
ID=14380633
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP54104437A Expired JPS5916221B2 (en) | 1979-08-16 | 1979-08-16 | Resonant circuit of piezoelectric vibrator |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5916221B2 (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0266321U (en) * | 1988-11-10 | 1990-05-18 | ||
| JPH02101806U (en) * | 1989-01-25 | 1990-08-14 |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US3501695A (en) * | 1965-04-08 | 1970-03-17 | Ericsson Telefon Ab L M | Resonance measuring apparatus utilizing the sideband signals of an fm-test signal for feedback control |
-
1979
- 1979-08-16 JP JP54104437A patent/JPS5916221B2/en not_active Expired
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH0266321U (en) * | 1988-11-10 | 1990-05-18 | ||
| JPH02101806U (en) * | 1989-01-25 | 1990-08-14 |
Also Published As
| Publication number | Publication date |
|---|---|
| JPS5627665A (en) | 1981-03-18 |
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