JPH01103925U - - Google Patents
Info
- Publication number
- JPH01103925U JPH01103925U JP19898187U JP19898187U JPH01103925U JP H01103925 U JPH01103925 U JP H01103925U JP 19898187 U JP19898187 U JP 19898187U JP 19898187 U JP19898187 U JP 19898187U JP H01103925 U JPH01103925 U JP H01103925U
- Authority
- JP
- Japan
- Prior art keywords
- resistance value
- resistors
- current group
- switch
- series
- 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
Landscapes
- Analogue/Digital Conversion (AREA)
Description
第１図は本考案によるＤ／Ａコンバータの一実
施例を示す回路図、第２図は従来のＤ／Ａコンバ
ータの一例を示す回路図である。
１……基準電圧入力端子、５……アナログ信号
出力端子、Ｒ１，Ｒ２・・・Ｒ７……抵抗値をｒ
ｏ［Ω］とする抵抗器、Ｒ８，Ｒ９・・・Ｒ１６
……抵抗値を２ｒｏ［Ω］とする抵抗器、Ｓ１，
Ｓ２・・・Ｓ８……ＣＭＯＳ ＦＥＴからなるオ
ン抵抗値をｒｓ［Ω］とする切換スイツチ、Ｑ１
，Ｑ２・・・Ｑ７……ＣＭＯＳ ＦＥＴからなる
オン抵抗値を１／２・ｒｓ［Ω］とする接続スイ
ツチ、Ｑ８……ＣＭＯＳ ＦＥＴからなるオン抵
抗値をｒｓ［Ω］とする接続スイツチ。
FIG. 1 is a circuit diagram showing an embodiment of a D/A converter according to the present invention, and FIG. 2 is a circuit diagram showing an example of a conventional D/A converter. 1...Reference voltage input terminal, 5...Analog signal output terminal, R1 , R2 ... R7 ...Resistance value r
Resistors with o [Ω], R 8 , R 9 ...R 16
...Resistor with a resistance value of 2ro [Ω], S 1 ,
S2 ... S8 ...CMOS FET switch whose on-resistance value is rs [Ω], Q1
, Q 2 ...Q 7 ... Connection switch that has an on-resistance value of 1/2 rs [Ω] made of a CMOS FET, Q 8 ... Connection that has an on-resistance value of rs [Ω] that consists of a CMOS FET Switch.
Claims (1)
抗値を２ｒｏ［Ω］とする複数の抵抗器からなり
、２進に重み付けられた電流群を形成するラダー
抵抗網と、 オン抵抗値をｒｓ［Ω］とするアナログスイツ
チからなり、入力されるデイジタル信号によつて
その切換えが制御され、上記ラダー抵抗網によつ
て得られる２進に重み付けられた電流群から必要
な電流群を選択する切換スイツチ群とを有してな
るＤ／Ａコンバータにおいて、 上記抵抗値をｒｏ［Ω］とする複数の抵抗器に
それぞれオン抵抗値を１／２・ｒｓ［Ω］とする
アナログスイツチからなる接続スイツチを直列に
接続すると共に、 上記抵抗値を２ｒｏ［Ω］とする複数の抵抗器
のうち上記切換スイツチの可動接点に接続されて
いない抵抗器にオン抵抗値をｒｓ［Ω］とするア
ナログスイツチからなる接続スイツチを直列に接
続したことを特徴とするＤ／Ａコンバータ。[Claims for Utility Model Registration] A ladder consisting of a plurality of resistors with a resistance value of ro [Ω] and a plurality of resistors with a resistance value of 2ro [Ω], forming a binary-weighted current group. It consists of a resistor network and an analog switch with an on-resistance value of rs [Ω], the switching of which is controlled by an input digital signal, and a binary weighted current group obtained by the ladder resistor network. In a D/A converter having a group of changeover switches for selecting a necessary current group from ] are connected in series, and the on-resistance value is set for the resistor that is not connected to the movable contact of the changeover switch among the plurality of resistors whose resistance value is 2ro [Ω]. A D/A converter characterized in that a connection switch consisting of an analog switch of rs [Ω] is connected in series.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19898187U JPH01103925U (en) | 1987-12-25 | 1987-12-25 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP19898187U JPH01103925U (en) | 1987-12-25 | 1987-12-25 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH01103925U true JPH01103925U (en) | 1989-07-13 |
Family
ID=31489456
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP19898187U Pending JPH01103925U (en) | 1987-12-25 | 1987-12-25 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH01103925U (en) |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57116420A (en) * | 1980-11-27 | 1982-07-20 | Itt | R-2r resistor circuit network |
| JPS5879331A (en) * | 1981-11-05 | 1983-05-13 | Sanyo Electric Co Ltd | Digital-to-analog conversion circuit |
-
1987
- 1987-12-25 JP JP19898187U patent/JPH01103925U/ja active Pending
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57116420A (en) * | 1980-11-27 | 1982-07-20 | Itt | R-2r resistor circuit network |
| JPS5879331A (en) * | 1981-11-05 | 1983-05-13 | Sanyo Electric Co Ltd | Digital-to-analog conversion circuit |
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