JPH03109434U - - Google Patents
Info
- Publication number
- JPH03109434U JPH03109434U JP1916290U JP1916290U JPH03109434U JP H03109434 U JPH03109434 U JP H03109434U JP 1916290 U JP1916290 U JP 1916290U JP 1916290 U JP1916290 U JP 1916290U JP H03109434 U JPH03109434 U JP H03109434U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- voltage
- digital
- down counter
- value
- 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
- 238000005259 measurement Methods 0.000 claims description 2
- 230000006641 stabilisation Effects 0.000 claims description 2
- 238000011105 stabilization Methods 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 2
- 239000013078 crystal Substances 0.000 description 1
Landscapes
- Stabilization Of Oscillater, Synchronisation, Frequency Synthesizers (AREA)
Description
第１図は本考案の一実施例を示すブロツク構成
図、第２図は動作を説明するためのタイミングチ
ヤート、第３図は従来例を示すブロツク構成図で
ある。
１……ＣＰＵ、１０……自動周波数安定化回路
、１１……周波数測定用カウンタ、１２……周波
数設定器、１３……比較器、１４……水晶発振器
、１５……タイミングパルス発生回路、１６……
周波数調整回路、１７……アツプダウンカウンタ
、１８……Ｄ／Ａ変換器、１９……Ｖ／Ｆ変換器
。
FIG. 1 is a block diagram showing an embodiment of the present invention, FIG. 2 is a timing chart for explaining the operation, and FIG. 3 is a block diagram showing a conventional example. 1... CPU, 10... Automatic frequency stabilization circuit, 11... Frequency measurement counter, 12... Frequency setter, 13... Comparator, 14... Crystal oscillator, 15... Timing pulse generation circuit, 16 ……
Frequency adjustment circuit, 17...Up-down counter, 18...D/A converter, 19...V/F converter.
Claims (1)
デジタル／アナログ変換器と、このデジタル／ア
ナログ変換器の出力電圧を周波数変換する電圧／
周波数変換器とこの電圧／周波数変換器からの出
力周波数を単位時間毎に測定する周波数測定回路
と、この周波数測定回路の測定結果と予め設定さ
れる周波数設定値との大小を比較する比較器と、
この比較器の大小比較結果に応じてアツプまたは
ダウンカウントするアツプダウンカウンタであつ
て、そのカウント値が上記入力デジタル値として
用いられるアツプダウンカウンタと具備し、上記
出力周波数が上記周波数設定値に一致するように
上記アツプダウンカウンタを制御するようにした
ことを特徴とするデジタル式自動周波数安定化回
路。 A digital/analog converter converts an input digital value into an analog voltage signal, and a voltage/analog converter converts the output voltage of the digital/analog converter into a frequency signal.
A frequency converter, a frequency measuring circuit that measures the output frequency from this voltage/frequency converter every unit time, and a comparator that compares the measurement result of this frequency measuring circuit with a preset frequency setting value. ,
An up-down counter that counts up or down according to the comparison result of the comparator, the count value of which is used as the input digital value, and the output frequency matches the frequency setting value. A digital automatic frequency stabilization circuit characterized in that the up-down counter is controlled in such a manner as to control the up-down counter.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1916290U JPH03109434U (en) | 1990-02-27 | 1990-02-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP1916290U JPH03109434U (en) | 1990-02-27 | 1990-02-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH03109434U true JPH03109434U (en) | 1991-11-11 |
Family
ID=31522300
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP1916290U Pending JPH03109434U (en) | 1990-02-27 | 1990-02-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH03109434U (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005079998A (en) * | 2003-09-01 | 2005-03-24 | Sanyo Electric Co Ltd | Oscillation frequency control circuit |
-
1990
- 1990-02-27 JP JP1916290U patent/JPH03109434U/ja active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2005079998A (en) * | 2003-09-01 | 2005-03-24 | Sanyo Electric Co Ltd | Oscillation frequency control circuit |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| GB2007450A (en) | Oscillator Circuit | |
| JPH03109434U (en) | ||
| US4246571A (en) | High resolution quantizer | |
| GB1111355A (en) | Stabilised variable oscillator | |
| JPS6154392U (en) | ||
| JP3023680B2 (en) | PWM controller | |
| SU824157A1 (en) | Temperature regulating device | |
| SU1509946A1 (en) | Device for nonlinear correction of discrete signals | |
| JPS6424389U (en) | ||
| JPH0216314Y2 (en) | ||
| JPH0454458Y2 (en) | ||
| JPS642161Y2 (en) | ||
| JPH0311187B2 (en) | ||
| JPS6024607B2 (en) | Calibration voltage generator | |
| JPS58166188U (en) | Automatic gain control circuit for multi-tube color television camera | |
| JPH0337325B2 (en) | ||
| JPH0747341B2 (en) | Manual printer | |
| JPS5936030Y2 (en) | sweep receiver | |
| JPH03104871U (en) | ||
| JPS6154391U (en) | ||
| JPH07263956A (en) | Digital temperature compensation oscillator | |
| JPH0447393U (en) | ||
| JPS62124594U (en) | ||
| JPS6340025U (en) | ||
| JPH0469768U (en) |