JPH048523U - - Google Patents
Info
- Publication number
- JPH048523U JPH048523U JP4865890U JP4865890U JPH048523U JP H048523 U JPH048523 U JP H048523U JP 4865890 U JP4865890 U JP 4865890U JP 4865890 U JP4865890 U JP 4865890U JP H048523 U JPH048523 U JP H048523U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- voltage
- crystal oscillator
- correction voltage
- variable capacitor
- 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
- 239000013078 crystal Substances 0.000 claims description 7
- 239000003990 capacitor Substances 0.000 claims 5
- 230000010355 oscillation Effects 0.000 claims 2
- 238000005259 measurement Methods 0.000 claims 1
- 230000000087 stabilizing effect Effects 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Oscillators With Electromechanical Resonators (AREA)
Description
第１図、第２図はそれぞれ本考案の第１実施例
、第２実施例のブロツク図、第３図は従来の水晶
発振器の配線図である。
１０……水晶発振器、１１……バリキヤツプ、
１２……周波数カウンタ、１３……基準周波数設
定回路、１４……周波数補正値設定回路、１５…
…補正電圧発生回路、１８……バツフアゲート、
２０……制御部。
1 and 2 are block diagrams of the first and second embodiments of the present invention, respectively, and FIG. 3 is a wiring diagram of a conventional crystal oscillator. 10...Crystal oscillator, 11...Varicap,
12... Frequency counter, 13... Reference frequency setting circuit, 14... Frequency correction value setting circuit, 15...
...Correction voltage generation circuit, 18...Buffer gate,
20...Control unit.
Claims (1)
調整を行なう水晶発振器と、前記水晶発振器の発
振周波数を計測する周波数カウンタと、前記周波
数カウンタの測定値を基準周波数設定回路の設定
周波数と比較して、その大小関係から前記可変容
量に差分的に印加すべき補正電圧数値を定める周
波数補正値設定回路と、前記周波数補正値設定回
路の出力をラツチし前記可変容量の補正電圧に変
換する補正電圧発生回路とを含んでなる安定化水
晶発振回路。 ２ 電圧可変容量への印加電圧を変えて周波数の
調整を行なう水晶発振器と、前記水晶発振器の発
振周波数を計測する周波数カウンタと、ＲＯＭ、
ＲＡＭおよびＣＰＵを含み、前記周波数カウンタ
の出力値を入力し、ＲＯＭに選定した基準周波数
を参照して、前記可変容量に差分的に印加すべき
補正電圧数値をＣＰＵで演算し出力する制御部と
、前記制御部の出力をラツチし前記可変容量の補
正電圧に変換する補正電圧発生回路とを含んでな
る安定化水晶発振回路。[Claims for Utility Model Registration] 1. A crystal oscillator whose frequency is adjusted by changing the voltage applied to a voltage variable capacitor, a frequency counter that measures the oscillation frequency of the crystal oscillator, and a measurement value of the frequency counter that is used as a reference frequency. A frequency correction value setting circuit that determines a correction voltage value to be differentially applied to the variable capacitor based on the magnitude relationship in comparison with the setting frequency of the setting circuit; A stabilizing crystal oscillator circuit comprising: a correction voltage generating circuit for converting the correction voltage into a correction voltage; 2. A crystal oscillator that adjusts the frequency by changing the voltage applied to the voltage variable capacitor, a frequency counter that measures the oscillation frequency of the crystal oscillator, and a ROM;
a control section including a RAM and a CPU, which inputs the output value of the frequency counter, refers to a reference frequency selected in the ROM, calculates and outputs a correction voltage value to be differentially applied to the variable capacitor by the CPU; and a correction voltage generation circuit that latches the output of the control section and converts it into a correction voltage of the variable capacitor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4865890U JPH048523U (en) | 1990-05-11 | 1990-05-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP4865890U JPH048523U (en) | 1990-05-11 | 1990-05-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH048523U true JPH048523U (en) | 1992-01-27 |
Family
ID=31565668
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP4865890U Pending JPH048523U (en) | 1990-05-11 | 1990-05-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH048523U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009246744A (en) * | 2008-03-31 | 2009-10-22 | Fujitsu Ltd | Apparatus with clock generation function, method for setting reference frequency or the like, and method for adjusting reference frequency or the like |
-
1990
- 1990-05-11 JP JP4865890U patent/JPH048523U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2009246744A (en) * | 2008-03-31 | 2009-10-22 | Fujitsu Ltd | Apparatus with clock generation function, method for setting reference frequency or the like, and method for adjusting reference frequency or the like |
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