JPH0236214U - - Google Patents
Info
- Publication number
- JPH0236214U JPH0236214U JP11454388U JP11454388U JPH0236214U JP H0236214 U JPH0236214 U JP H0236214U JP 11454388 U JP11454388 U JP 11454388U JP 11454388 U JP11454388 U JP 11454388U JP H0236214 U JPH0236214 U JP H0236214U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- signal
- outputs
- generating circuit
- controlled
- 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.)
- Granted
Links
- 238000007493 shaping process Methods 0.000 claims 2
- 238000010586 diagram Methods 0.000 description 3
Landscapes
- Manipulation Of Pulses (AREA)
Description
第1図は本考案に係る正弦波発振器の一実施例
を示す図、第2図は第1図回路の動作を示すタイ
ムチヤート、第3図は設定信号SAと分周信号S
Bと出力周波数範囲との関係例を示す図、第4図
はデジタルフイルタの減衰特性例を示す図、第5
図は従来例を示す図である。
1……カウンタ、2……トグルFF、3……デ
ジタルフイルタ、4……プロセツサ、6……分周
器、G1……オアゲート。
Fig. 1 is a diagram showing an embodiment of the sine wave oscillator according to the present invention, Fig. 2 is a time chart showing the operation of the circuit shown in Fig. 1, and Fig. 3 is a setting signal SA and a frequency-divided signal S.
Figure 4 is a diagram showing an example of the relationship between B and the output frequency range. Figure 4 is a diagram showing an example of the attenuation characteristic of a digital filter.
The figure shows a conventional example. 1... Counter, 2... Toggle FF, 3... Digital filter, 4... Processor, 6... Frequency divider, G1... OR gate.
Claims (1)
ロツクを分周したクロツク信号CLKを出力する
分周器と、 クロツク信号CLKを計数し、設定信号SAに
より設定された計数値ごとにパルス信号を繰返し
出力する設定周波数発生回路1,G1と、 この設定周波数発生回路の出力を導入し、デユ
ーテイ50%の方形波信号に変換して出力する波
形整形手段2と、 前記クロツク信号CLKの周波数により制御さ
れるカツトオフ周波数を持ち、導入した波形整形
手段の方形波信号の基本周波数信号のみを取出す
低域通過形デジタルフイルタと、 を備えた正弦波発振器。[Claims for Utility Model Registration] A frequency divider whose frequency division ratio is controlled by a frequency division signal SB and which outputs a clock signal CLK obtained by dividing a basic clock; a set frequency generating circuit 1, G1 that repeatedly outputs a pulse signal for each count value, and a waveform shaping means 2 that inputs the output of the set frequency generating circuit, converts it into a square wave signal with a duty of 50%, and outputs it. A sine wave oscillator comprising: a low-pass digital filter having a cutoff frequency controlled by the frequency of the clock signal CLK and extracting only the fundamental frequency signal of the square wave signal of the introduced waveform shaping means.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988114543U JPH0611622Y2 (en) | 1988-08-31 | 1988-08-31 | Sine wave oscillator |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP1988114543U JPH0611622Y2 (en) | 1988-08-31 | 1988-08-31 | Sine wave oscillator |
Publications (2)
Publication Number | Publication Date |
---|---|
JPH0236214U true JPH0236214U (en) | 1990-03-08 |
JPH0611622Y2 JPH0611622Y2 (en) | 1994-03-23 |
Family
ID=31355389
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP1988114543U Expired - Lifetime JPH0611622Y2 (en) | 1988-08-31 | 1988-08-31 | Sine wave oscillator |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPH0611622Y2 (en) |
Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5760707A (en) * | 1980-09-29 | 1982-04-12 | Nec Corp | Oscillating circuit |
JPS60247308A (en) * | 1984-05-23 | 1985-12-07 | Nec Corp | Generator of variable frequency sine wave signal |
-
1988
- 1988-08-31 JP JP1988114543U patent/JPH0611622Y2/en not_active Expired - Lifetime
Patent Citations (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS5760707A (en) * | 1980-09-29 | 1982-04-12 | Nec Corp | Oscillating circuit |
JPS60247308A (en) * | 1984-05-23 | 1985-12-07 | Nec Corp | Generator of variable frequency sine wave signal |
Also Published As
Publication number | Publication date |
---|---|
JPH0611622Y2 (en) | 1994-03-23 |