JPS5467476A - Level detecting switch circuit - Google Patents
Level detecting switch circuitInfo
- Publication number
- JPS5467476A JPS5467476A JP13428477A JP13428477A JPS5467476A JP S5467476 A JPS5467476 A JP S5467476A JP 13428477 A JP13428477 A JP 13428477A JP 13428477 A JP13428477 A JP 13428477A JP S5467476 A JPS5467476 A JP S5467476A
- Authority
- JP
- Japan
- Prior art keywords
- diode
- transistor
- level
- constant voltage
- becomes
- 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
Landscapes
- Measurement Of Current Or Voltage (AREA)
Abstract
PURPOSE: To obtain hysterisis characteristics, which are free from the influences from the constants of elements other than a transistor and first and second constant voltage diodes and from the temperature, by setting the conduction operation starting level of the transistor with the use of the first diode and by setting the inconduction operation starting level with the use of the second diode.
CONSTITUTION: When the level of input signals IN becomes higher than the Zenor level of a constant voltage diode Z1, this diode Z1 becomes conductive so that a base current begins flowing through a transistor Q1 and so that another transistor Q2 starts its operation to have its collector potential decreased. Then, another constant voltage diode Z2 becomes conductive, but the diode Z1 is turned inconductive so that the transistors Q1 and Q2 are rendered completely conductive. At the next step, the level of the signals IN is lowered to the Zenor level of the diode Z2, the diode Z2 becomes inconductive to lower the base current of the transistor Q1 so that the collector voltage of the transistor Q2 is raised and so that the two transistors are cut off by the positive feedback. The switch circuit thus constructed can easily set the hysterisis range, simply change it and improve the temperature characteristics it.
COPYRIGHT: (C)1979,JPO&Japio
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13428477A JPS5467476A (en) | 1977-11-09 | 1977-11-09 | Level detecting switch circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP13428477A JPS5467476A (en) | 1977-11-09 | 1977-11-09 | Level detecting switch circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS5467476A true JPS5467476A (en) | 1979-05-30 |
Family
ID=15124676
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP13428477A Pending JPS5467476A (en) | 1977-11-09 | 1977-11-09 | Level detecting switch circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS5467476A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57151869A (en) * | 1981-02-17 | 1982-09-20 | Burroughs Corp | Threshold value detector circuit |
-
1977
- 1977-11-09 JP JP13428477A patent/JPS5467476A/en active Pending
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS57151869A (en) * | 1981-02-17 | 1982-09-20 | Burroughs Corp | Threshold value detector circuit |
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