JPH01101007A - Crystal oscillation circuit - Google Patents
Crystal oscillation circuitInfo
- Publication number
- JPH01101007A JPH01101007A JP62258709A JP25870987A JPH01101007A JP H01101007 A JPH01101007 A JP H01101007A JP 62258709 A JP62258709 A JP 62258709A JP 25870987 A JP25870987 A JP 25870987A JP H01101007 A JPH01101007 A JP H01101007A
- Authority
- JP
- Japan
- Prior art keywords
- oscillation
- frequency
- filter
- pass
- circuit
- 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 title claims abstract description 41
- 239000013078 crystal Substances 0.000 title claims abstract description 27
- 230000000694 effects Effects 0.000 description 4
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Abstract
Description
【発明の詳細な説明】
〔産業上の利用分野〕
本発明は、水晶振動子を用いた水晶発振回路に関するも
のである。DETAILED DESCRIPTION OF THE INVENTION [Field of Industrial Application] The present invention relates to a crystal oscillation circuit using a crystal resonator.
従来のこの種の水晶発振回路は、例えＬｆＴＴＬのゲー
ト素子を用いた場合、第４図に示すような構成であった
。A conventional crystal oscillation circuit of this type has a configuration as shown in FIG. 4, even if an LfTTL gate element is used.
この第３図に於いて、抵抗Ｒ１を並列に接続した第１ゲ
ート回路Ｇｌの入力端子は抵抗Ｒ２を介して水晶振動子
１と接続されており、この第１ゲート回路Ｇｌは抵抗Ｒ
曹との並列接続および抵抗Ｒ２との直列接続により、線
形アンプとして作動する。抵抗Ｒ３を並列に接続した第
２ゲート回路Ｇ２の入力端子は抵抗に４を介して第１ゲ
ート回路Ｇｌの出力端子と接続されており、第２ゲート
回路Ｇ２は抵抗３との並列接続および抵抗Ｒ４との直列
接続により、線形アンプとして作動する。In this FIG. 3, the input terminal of the first gate circuit Gl, which has a resistor R1 connected in parallel, is connected to the crystal resonator 1 via a resistor R2, and this first gate circuit Gl has a resistor R1 connected in parallel.
By connecting it in parallel with R2 and in series with resistor R2, it operates as a linear amplifier. The input terminal of the second gate circuit G2 with the resistor R3 connected in parallel is connected to the output terminal of the first gate circuit Gl via the resistor 4, and the second gate circuit G2 is connected in parallel with the resistor 3 and the resistor 4. By series connection with R4, it operates as a linear amplifier.
第２ゲート回路Ｇ２の出力端子は水晶振動子１および端
子２と接続されている。以上よりＴＴＬ型水晶発振回路
が構成され、端子２にその出力信号が得られる。The output terminal of the second gate circuit G2 is connected to the crystal resonator 1 and the terminal 2. As described above, a TTL type crystal oscillation circuit is constructed, and its output signal is obtained at terminal 2.
しかしながら、前述の構成においては、水晶振動子１の
発振モードを選択する機能を持たないために、回路出力
として所望の発振周波数が得られないという問題があっ
た。However, in the above-mentioned configuration, there was a problem that a desired oscillation frequency could not be obtained as a circuit output because it did not have a function to select the oscillation mode of the crystal resonator 1.
そこで、本発明は前記問題点に鑑みてなされたもので、
常時安定な周波数を出力する水晶発振回路を得ることを
目的とする。Therefore, the present invention has been made in view of the above problems.
The purpose is to obtain a crystal oscillation circuit that outputs a stable frequency at all times.
上記目的を達成するために、実施例に対応する第１図を
用いて説明すると、本発明は、水晶振動子（１）を用い
た水晶発振回路に於いて、
前記水晶振動子（１）を含む発振ループの中に、単一の
発振モードの発振周波数を通過させ、他の発振モードで
の発振周波数を通過させないようにしたフィルター（３
）を設けたことを技術的要件としている。In order to achieve the above object, the present invention will be explained using FIG. 1 corresponding to an embodiment. In a crystal oscillation circuit using a crystal resonator (1), the present invention provides The oscillation loop includes a filter (3
) is a technical requirement.
以上の構成によれば、前記フィルター（３）で発振モー
ドを設定するために、前記フィルター（３）が所望の周
波数の信号を通過し、所望以外の周波数での発振を妨げ
るので、発振は前記フィルター（３）に選択された単一
モードでのものとなり、水晶発振回路の発振周波数を制
御することができる。According to the above configuration, in order to set the oscillation mode with the filter (3), the filter (3) passes a signal of a desired frequency and prevents oscillation at a frequency other than the desired frequency, so that the oscillation does not occur as described above. The filter (3) is selected in a single mode, and the oscillation frequency of the crystal oscillation circuit can be controlled.
本発明の実施例を第１図に基づいて説明する。 An embodiment of the present invention will be described based on FIG.
第１図は本発明の実施例に係る水晶発振回路の構成図で
ある。この第１図中、第４図中と同一符号の電気素子は
同一素子であるので、説明を省略する。FIG. 1 is a configuration diagram of a crystal oscillation circuit according to an embodiment of the present invention. Electrical elements in FIG. 1 and FIG. 4 having the same reference numerals are the same elements, so their explanations will be omitted.
第１図に於いて、抵抗Ｒ４を介して第２ゲート回路Ｇ２
と第１ケート回路Ｇ１との間に、発振モードを設定する
フィルター３が設けられている。In FIG. 1, the second gate circuit G2 is connected via the resistor R4.
A filter 3 for setting an oscillation mode is provided between the first gate circuit G1 and the first gate circuit G1.
そして、水晶振動子１の固有振動周波数ｆ、の５倍の信
号を端子２に出力したいときは、フィルター３の周波数
特性を、所望の周波数５ ｆ、を通過させ、他の周波数
ム、３ ｆ、、７ ｆ、、・・・・・を通過させないよ
うに設けておく。これによって、所望の周波数５ ｆ、
の信号がフィルター３を通過し、所望以外の周波数ム、
３１ｍ、７ ｆ、、・・−・−・の信号はフィルター３
を通過できないため、所望以外の周波数ム、３ム、７ム
、・・・・−・での発振が妨げられる。When it is desired to output a signal that is five times the natural vibration frequency f of the crystal oscillator 1 to the terminal 2, the frequency characteristics of the filter 3 are such that the desired frequency 5 f is passed through, and the other frequencies 3 f , 7 f, . . . are provided so as not to pass through. This allows the desired frequency 5 f,
The signal passes through the filter 3 and undesired frequencies,
The signal at 31m, 7f,... is filter 3.
, so that oscillation at frequencies other than desired, such as MU, 3MU, 7MU, . . . , is prevented.
第２図は、本発明の別実施例に係る水晶発振回路の構成
図で、この水晶発振回路は、上述のフィルター３をさら
に多数（３ａ、３ｂ、−・・・−・）設け、これらのう
ち一つのフィルターをスイッチ等の接続回路４で接続す
ることにより、出力周波数に汎用性をもたせたものであ
る。FIG. 2 is a block diagram of a crystal oscillation circuit according to another embodiment of the present invention, and this crystal oscillation circuit is provided with a larger number of the above-mentioned filters 3 (3a, 3b, . . . ). By connecting one of the filters with a connection circuit 4 such as a switch, the output frequency can be made more versatile.
すなわち、第１フイルター３ａには、固有振動周波数ム
の信号を通過させ、他の周波数３ ｆ、、５ム、・・・
・−・の信号は通過させないような周波数特性を設定し
、また第２フイルター３ｂには、周波数３九の信号を通
過させ、他の周波数ム、５ム、・−・の信号は通過させ
ないような周波数特性を設定し、以下の各フィルターも
それぞれ所望の出力周波数の設定に応じて前述と同様に
発振モードを設定する。従って、これらのフィルターの
うち一つのフィルターを、接続回路４によって接続する
ことにより、出力周波数に汎用性が得られる。That is, the first filter 3a passes the signal of the natural vibration frequency m, and transmits the signal of the other frequencies 3f, 5m, . . .
The frequency characteristics are set so as not to pass the signals of . The frequency characteristics are set, and the oscillation mode of each of the following filters is set in the same manner as described above according to the setting of the desired output frequency. Therefore, by connecting one of these filters through the connection circuit 4, versatility in output frequency can be obtained.
以上の実施例によれば、フィルター３は第１ゲート回路
Ｇ１と抵抗Ｒ４との間に設けたが、これに限らず、水晶
振動子１と抵抗Ｒ２または第２ゲート回路Ｇ２との間に
設けても良く、これにより前述と同様に効果が得られる
のはいうまでもない。According to the above embodiment, the filter 3 is provided between the first gate circuit G1 and the resistor R4, but the filter 3 is provided between the crystal resonator 1 and the resistor R2 or the second gate circuit G2. Needless to say, the same effect as described above can be obtained by doing so.
また、前記実施例ではＴＴＬ型水晶発振回路を例にとっ
て述べたが、他の水晶発振回路においても水晶振動子を
含む発振ループの中に前述のフィルター３を設けること
で、同様の効果が得られる。Further, although the above embodiment has been described using a TTL type crystal oscillation circuit as an example, similar effects can be obtained in other crystal oscillation circuits by providing the above-mentioned filter 3 in the oscillation loop including the crystal resonator. .
以上の本発明によれば、フィルターによって発振モード
を設定するために、発振回路の出力周波数を制御するこ
とができる。According to the present invention described above, the output frequency of the oscillation circuit can be controlled in order to set the oscillation mode using the filter.
Ｒ薗〜Ｒ４・・−・・−・・−抵抗
Ｇ菖、Ｇ２−・−・−・−ゲート回路
１・・・・−・・・−・水晶振動子 ３−−−−・−
フィルター４−・−・・・・・・・・接続回路R son~R4...--Resistance G iris, G2---Gate circuit 1...--Crystal oscillator 3-------
Filter 4--...Connection circuit
Claims (2)
水晶振動子を含む発振ループの中に、単一の発振モード
の発振周波数を通過させ、他の発振モードでの発振周波
数を通過させないようにしたフィルターを設けたことを
特徴とする水晶発振回路。(1) In a crystal oscillation circuit using a crystal resonator, the oscillation frequency of a single oscillation mode is passed through the oscillation loop including the crystal resonator, and the oscillation frequencies of other oscillation modes are passed. A crystal oscillator circuit characterized by being provided with a filter that prevents this from occurring.
モードを設けた多数の前記フィルターと、これらのフィ
ルターのいずれか一つに接続する接続回路とを備えたこ
とを特徴とする水晶発振回路。(2) A crystal according to claim 1, comprising a large number of the filters provided with respective oscillation modes, and a connection circuit connected to any one of these filters. Oscillation circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258709A JPH01101007A (en) | 1987-10-14 | 1987-10-14 | Crystal oscillation circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62258709A JPH01101007A (en) | 1987-10-14 | 1987-10-14 | Crystal oscillation circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01101007A true JPH01101007A (en) | 1989-04-19 |
Family
ID=17324005
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62258709A Pending JPH01101007A (en) | 1987-10-14 | 1987-10-14 | Crystal oscillation circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01101007A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002204128A (en) * | 2000-10-27 | 2002-07-19 | Nippon Precision Circuits Inc | Oscillation circuit and integrated circuit for oscillation |
-
1987
- 1987-10-14 JP JP62258709A patent/JPH01101007A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002204128A (en) * | 2000-10-27 | 2002-07-19 | Nippon Precision Circuits Inc | Oscillation circuit and integrated circuit for oscillation |
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