JPH0353041U - - Google Patents
Info
- Publication number
- JPH0353041U JPH0353041U JP11322789U JP11322789U JPH0353041U JP H0353041 U JPH0353041 U JP H0353041U JP 11322789 U JP11322789 U JP 11322789U JP 11322789 U JP11322789 U JP 11322789U JP H0353041 U JPH0353041 U JP H0353041U
- Authority
- JP
- Japan
- Prior art keywords
- generation means
- generates
- count value
- width modulated
- pulse width
- 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
- 238000010586 diagram Methods 0.000 description 2
Description
第１図は本考案の一実施例の構成を示す構成図
、第２図は第１図に示した装置の動作状態におけ
る各部の信号波形を示すタイムチヤート、第３図
はＤ／Ａ変換器の他の構成例の構成を示す構成図
である。
１……カウンタ値生成手段、２……付加パルス
生成手段、３……比較手段、４……ＰＷＭ出力手
段、５……８ビツトカウンタ、６……２ビツトカ
ウンタ、７……８ビツト比較器、８……２ビツト
比較器、９……論理ゲート、１０……論理ゲート
、１１……Ｄフリツプフロツプ、１２……ローパ
スフイルタ、１３……１０ビツトカウンタ、１４
……１０ビツト比較器。
Fig. 1 is a block diagram showing the configuration of an embodiment of the present invention, Fig. 2 is a time chart showing signal waveforms of various parts in the operating state of the device shown in Fig. 1, and Fig. 3 is a D/A converter. It is a block diagram which shows the structure of another example of a structure. 1...Counter value generation means, 2...Additional pulse generation means, 3...Comparison means, 4...PWM output means, 5...8 bit counter, 6...2 bit counter, 7...8 bit comparator , 8... 2-bit comparator, 9... logic gate, 10... logic gate, 11... D flip-flop, 12... low pass filter, 13... 10 bit counter, 14
...10-bit comparator.
Claims (1)
号を生成し、このパルス幅変調された信号をロー
パスフイルタを通過さることによりアナログ信号
に変換するＤ／Ａ変換器において、 分割された複数のＰＷＭ周期に応じたカウント
値を生成するカウント値生成手段１と、 入力デイジタルデータとカウント値生成手段１
で生成されたカウント値とを比較する比較手段２
と、 付加パルスを生成する付加パルス生成手段３と
、 比較手段２の比較出力と付加パルス生成手段３
で生成されたパルスとを合成してパルス幅変調出
力を生成するＰＷＭ出力手段４と、 分割されたＰＷＭ周期に応じたカツトオフ周波
数に設定され、ＰＷＭ出力手段４のパルス幅変調
出力をフイルタリングするローパスフイルタ１２
とを有することを特徴とするＤ／Ａ変換器。[Claims for Utility Model Registration] In a D/A converter that generates a pulse width modulated signal in response to a digital signal and converts this pulse width modulated signal into an analog signal by passing it through a low-pass filter, Count value generation means 1 that generates count values according to a plurality of divided PWM cycles; and input digital data and count value generation means 1.
Comparison means 2 for comparing the count value generated by
, Additional pulse generation means 3 that generates additional pulses, Comparison output of comparison means 2 and additional pulse generation means 3
a PWM output means 4 which synthesizes the pulses generated by the PWM output means 4 to generate a pulse width modulated output; Low pass filter 12
A D/A converter comprising:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11322789U JPH0353041U (en) | 1989-09-27 | 1989-09-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP11322789U JPH0353041U (en) | 1989-09-27 | 1989-09-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0353041U true JPH0353041U (en) | 1991-05-22 |
Family
ID=31661646
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP11322789U Pending JPH0353041U (en) | 1989-09-27 | 1989-09-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0353041U (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136028A (en) * | 1980-03-27 | 1981-10-23 | Toshiba Corp | D-a converter |
| JPS63310221A (en) * | 1987-06-12 | 1988-12-19 | Hitachi Ltd | D/a converting circuit |
| JPS6436118A (en) * | 1987-07-31 | 1989-02-07 | Mazda Motor | Digital pulse width modulator |
-
1989
- 1989-09-27 JP JP11322789U patent/JPH0353041U/ja active Pending
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS56136028A (en) * | 1980-03-27 | 1981-10-23 | Toshiba Corp | D-a converter |
| JPS63310221A (en) * | 1987-06-12 | 1988-12-19 | Hitachi Ltd | D/a converting circuit |
| JPS6436118A (en) * | 1987-07-31 | 1989-02-07 | Mazda Motor | Digital pulse width modulator |
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