JPH0310631U - - Google Patents
Info
- Publication number
- JPH0310631U JPH0310631U JP7023489U JP7023489U JPH0310631U JP H0310631 U JPH0310631 U JP H0310631U JP 7023489 U JP7023489 U JP 7023489U JP 7023489 U JP7023489 U JP 7023489U JP H0310631 U JPH0310631 U JP H0310631U
- Authority
- JP
- Japan
- Prior art keywords
- input terminal
- input
- input signal
- level
- circuit
- 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 4
Landscapes
- Manipulation Of Pulses (AREA)
Description
第１図は本考案に係る比較回路の一実施例を示
す図、第２図は第１図各部の信号波形を示す図、
第３図は従来例を示す図、第４図は第３図各部の
信号波形を示す図である。
Ｒ１……入力抵抗、Ｄ１，Ｄ２……保護用ダイ
オード、Ｕ１……コンパレータ、１……遅延素子
、２……ラツチ回路。
FIG. 1 is a diagram showing an embodiment of the comparison circuit according to the present invention, FIG. 2 is a diagram showing signal waveforms of each part in FIG. 1,
FIG. 3 is a diagram showing a conventional example, and FIG. 4 is a diagram showing signal waveforms at various parts in FIG. R1...Input resistance, D1, D2...Protection diode, U1...Comparator, 1...Delay element, 2...Latch circuit.
Claims (1)
ＬＯＷレベルが基準レベルを満たしているか否か
を判定する回路において、 入力抵抗Ｒ１を介して入力信号を一方の入力端
子に導入し、他方の入力端子に判定レベル電圧Ｖ
１を導入するコンパレータＵ１と、 入力信号が加えられるコンパレータの入力端子
と電源電圧＋５Ｖ間、および入力端子と共通電位
の間に設けられた２つの保護用ダイオードと、 コンパレータの出力を入力信号が変化した時点
から設定時間後に取込むラツチ回路と、 を備え、前記入力抵抗Ｒ１とダイオードの接合容
量とでローパスフイルタを形成し、このフイルタ
時定数が前記設定時間より小さくなるように設定
した比較回路。[Claims for Utility Model Registration] In a circuit that determines whether the HIGH level or LOW level of a square wave input signal satisfies a reference level, the input signal is introduced into one input terminal via an input resistor R1. and the judgment level voltage V is applied to the other input terminal.
1, and two protection diodes installed between the input terminal of the comparator to which the input signal is applied and the power supply voltage +5V, and between the input terminal and the common potential. a latch circuit that captures data after a set time from the point in time, and a low-pass filter is formed by the input resistor R1 and the junction capacitance of the diode, and the comparison circuit is configured such that the filter time constant is smaller than the set time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7023489U JPH0310631U (en) | 1989-06-15 | 1989-06-15 |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP7023489U JPH0310631U (en) | 1989-06-15 | 1989-06-15 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPH0310631U true JPH0310631U (en) | 1991-01-31 |
Family
ID=31606222
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP7023489U Pending JPH0310631U (en) | 1989-06-15 | 1989-06-15 |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPH0310631U (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002204147A (en) * | 2000-11-06 | 2002-07-19 | Fuji Electric Co Ltd | Noise cancel circuit |
| WO2014171127A1 (en) * | 2013-04-16 | 2014-10-23 | 株式会社デンソー | Drive control circuit, and ignition device for internal combustion engine |
-
1989
- 1989-06-15 JP JP7023489U patent/JPH0310631U/ja active Pending
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2002204147A (en) * | 2000-11-06 | 2002-07-19 | Fuji Electric Co Ltd | Noise cancel circuit |
| WO2014171127A1 (en) * | 2013-04-16 | 2014-10-23 | 株式会社デンソー | Drive control circuit, and ignition device for internal combustion engine |
| US9920735B2 (en) | 2013-04-16 | 2018-03-20 | Denso Corporation | Drive control circuit, and ignition device for internal combustion engine |
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