JPS6428030U - - Google Patents
Info
- Publication number
- JPS6428030U JPS6428030U JP12267787U JP12267787U JPS6428030U JP S6428030 U JPS6428030 U JP S6428030U JP 12267787 U JP12267787 U JP 12267787U JP 12267787 U JP12267787 U JP 12267787U JP S6428030 U JPS6428030 U JP S6428030U
- Authority
- JP
- Japan
- Prior art keywords
- frequency
- digital
- clock
- analog
- analog converter
- 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
- 239000003990 capacitor Substances 0.000 claims description 4
- 238000006243 chemical reaction Methods 0.000 claims 1
- 238000010586 diagram Methods 0.000 description 2
Landscapes
- Analogue/Digital Conversion (AREA)
- Filters That Use Time-Delay Elements (AREA)
Description
第１図は本考案に係るアナログ電圧発生器の一
実施例を示す要部構成図、第２図は従来のデイジ
タル・アナログ変換器の一例を示す構成図である
。
１…ＤＡＣ、２…スイツチド・キヤパシタ・フ
イルタ、３…バツフア・アンプ、４…分周器、５
…パルス発生器。
FIG. 1 is a block diagram showing the main parts of an embodiment of an analog voltage generator according to the present invention, and FIG. 2 is a block diagram showing an example of a conventional digital-to-analog converter. 1...DAC, 2...Switched capacitor filter, 3...Buffer amplifier, 4...Frequency divider, 5
...Pulse generator.
Claims (1)
バータで変換し、その後ローパスフイルタを通し
て高調波成分を除去するようにしてアナログ信号
を得るアナログ電圧発生器において、 前記ローパスフイルタを、カツトオフ周波数が
外部より与えられるクロツクの周波数に応じて決
定されるスイツチド・キヤパシタ・フイルタで構
成し、 基準クロツクを設定された分周比で分周し、前
記デイジタル・アナログ・コンバータに与えるタ
イミング・パルスを生成すると共に、前記スイツ
チド・キヤパシタ・フイルタに与えるクロツクと
して予め設定された一定の比率に基づき前記タイ
ミング・パルスに関連したクロツクを生成する分
周器と、 前記基準クロツクを発生するクロツク発生器と
を具備し、前記デイジタル・アナログ・コンバー
タの変換レートに応じて前記スイツチド・キヤパ
シタ・フイルタのカツトオフ周波数が自動的に変
化し、デイジタル・アナログ・コンバータの出力
に含まれる高周波成分の除去されたアナログ信号
が得られるように構成したことを特徴とするアナ
ログ電圧発生器。[Claims for Utility Model Registration] In an analog voltage generator that converts a digital signal with a digital-to-analog converter and then passes it through a low-pass filter to remove harmonic components to obtain an analog signal, the low-pass filter is set at a cut-off frequency. consists of a switched capacitor filter whose frequency is determined according to the frequency of an externally applied clock, divides the reference clock at a set frequency division ratio, and generates timing pulses to be applied to the digital-to-analog converter. and a frequency divider that generates a clock related to the timing pulse based on a preset constant ratio as a clock to be applied to the switched capacitor filter, and a clock generator that generates the reference clock. The cut-off frequency of the switched capacitor filter is automatically changed according to the conversion rate of the digital-to-analog converter, and an analog signal from which high frequency components contained in the output of the digital-to-analog converter are removed is obtained. An analog voltage generator characterized in that it is configured to
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12267787U JPS6428030U (en) | 1987-08-11 | 1987-08-11 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12267787U JPS6428030U (en) | 1987-08-11 | 1987-08-11 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6428030U true JPS6428030U (en) | 1989-02-17 |
Family
ID=31370829
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12267787U Pending JPS6428030U (en) | 1987-08-11 | 1987-08-11 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6428030U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58182917A (en) * | 1982-04-21 | 1983-10-26 | Hitachi Ltd | D/a converter |
| JPS62145927A (en) * | 1985-12-20 | 1987-06-30 | Hitachi Ltd | Data converter |
-
1987
- 1987-08-11 JP JP12267787U patent/JPS6428030U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS58182917A (en) * | 1982-04-21 | 1983-10-26 | Hitachi Ltd | D/a converter |
| JPS62145927A (en) * | 1985-12-20 | 1987-06-30 | Hitachi Ltd | Data converter |
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