JPH0480136U - - Google Patents
Info
- Publication number
- JPH0480136U JPH0480136U JP12459890U JP12459890U JPH0480136U JP H0480136 U JPH0480136 U JP H0480136U JP 12459890 U JP12459890 U JP 12459890U JP 12459890 U JP12459890 U JP 12459890U JP H0480136 U JPH0480136 U JP H0480136U
- Authority
- JP
- Japan
- Prior art keywords
- comparator
- integrated
- time
- value
- current
- 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
- 230000010354 integration Effects 0.000 claims description 2
- 238000010586 diagram Methods 0.000 description 6
- 238000006243 chemical reaction Methods 0.000 description 2
Landscapes
- Analogue/Digital Conversion (AREA)
Description
第１図は本考案を実施した縦続積分型Ａ／Ｄ変
換器の要部構成図、第２図は従来例と本考案を実
施した場合の積分器の逆積分時間と比較器の反転
タイミングのずれの関係を示す図、第３図は一般
的な縦続積分型Ａ／Ｄ変換回路の構成図、第４図
は第３図に示す変換回路の動作説明図、第５図は
従来例における逆積分波形とノイズによる比較器
の反転タイミングのずれの関係を示す図である。
１……積分器、２１，２２，２３……電流源、
３……第１の比較器、４……インターフエイス、
５……９ビツト上位カウンタ、６……第２の比較
器、７……７ビツト下位カウンタ、８……シフト
・レジスタ、９……制御回路、Ｓ１，Ｓ２，Ｓ３
，Ｓ４……スイツチ、Ｒ，Ｒ１，Ｒ２……抵抗、
２０……増幅器。
Figure 1 is a block diagram of the main parts of a cascade-integrating A/D converter in which the present invention is implemented, and Figure 2 shows the inverse integration time of the integrator and the inversion timing of the comparator in the conventional example and in the case of implementing the present invention. Figure 3 is a diagram showing the relationship between deviations, Figure 3 is a configuration diagram of a general cascade integral type A/D conversion circuit, Figure 4 is an explanatory diagram of the operation of the conversion circuit shown in Figure 3, and Figure 5 is a reverse diagram of the conventional example. FIG. 3 is a diagram showing a relationship between an integral waveform and a shift in inversion timing of a comparator due to noise. 1... Integrator, 21, 22, 23... Current source,
3...first comparator, 4...interface,
5... 9-bit upper counter, 6... second comparator, 7... 7-bit lower counter, 8... shift register, 9... control circuit, S1, S2, S3
, S4...Switch, R, R1 , R2 ...Resistance,
20...Amplifier.
Claims (1)
器により積分し、この積分値に電流Ｉ＋ｉ（電流
比Ｉ／ｉ＝２ｎ−１；ｎは後述する下位カウンタ
のビツト数）を与えて逆積分して第１の比較器の
設置値に達するまでの時間Ｔ３を上記カウンタで
計数し、次に電流ｉを与えて逆積分して第２の比
較器の設定値に達する時間Ｔ４を下位カウンタで
計数し、時間値Ｔ３及び時間値Ｔ４より前記アナ
ログ入力信号に対応するデイジタル信号を得る縦
続積分型Ａ／Ｄ変換器において、前記積分器と第
２の比較器の反転入力端子の間に増幅器を設けた
ことを特徴とする縦続積分型Ａ／Ｄ変換器。 The analog input signal is integrated by an integrator at a constant timing T, and this integrated value is inversely integrated by applying a current I+i (current ratio I/i=2 n -1; n is the number of bits of the lower counter described later). The time T3 until the set value of the first comparator is reached is counted by the above counter, and then the time T4 until the set value of the second comparator is reached by applying the current i and inversely integrated is counted by the lower counter. , an amplifier is provided between the integrator and the inverting input terminal of the second comparator, in a cascade integration type A/D converter that obtains a digital signal corresponding to the analog input signal from time value T3 and time value T4. A cascade integral type A/D converter characterized by:
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12459890U JPH0480136U (en) | 1990-11-27 | 1990-11-27 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP12459890U JPH0480136U (en) | 1990-11-27 | 1990-11-27 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0480136U true JPH0480136U (en) | 1992-07-13 |
Family
ID=31872239
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP12459890U Pending JPH0480136U (en) | 1990-11-27 | 1990-11-27 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0480136U (en) |
-
1990
- 1990-11-27 JP JP12459890U patent/JPH0480136U/ja active Pending
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