JPS6412614A - Voltage comparator circuit having hysteresis - Google Patents
Voltage comparator circuit having hysteresisInfo
- Publication number
- JPS6412614A JPS6412614A JP62167686A JP16768687A JPS6412614A JP S6412614 A JPS6412614 A JP S6412614A JP 62167686 A JP62167686 A JP 62167686A JP 16768687 A JP16768687 A JP 16768687A JP S6412614 A JPS6412614 A JP S6412614A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- threshold voltage
- amplifier
- input
- capacitors
- 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
Abstract
PURPOSE:To stably obtain a desired threshold voltage by canceling an offset by a switch and a capacitor and generating a threshold voltage by capacitance division. CONSTITUTION:In case of the voltage comparison, a control signal phi goes to 'L', switches 5, 6, 8, 10, 14 are nonconductive and switches 3, 9, 13 are conductive. In this case, an input terminal 1 connects to an inverting input of an operational amplifier 4 and capacitors 11, 12 are connected in series between an output terminal of the amplifier 4 and ground. Thus, the voltage applied to the noninverting input of the operational amplifier 4 is not affected by the input offset voltage, and a threshold voltage +V1 is expressed as +V1=+[C1/(C1+C2)]E1, where +E1 is a positive maximum output voltage of the amplifier 4 and C1, C2 are capacitances of the capacitors C1, C2 respectively. On the other hand, the threshold voltage -V2 is expressed as -V2=-[C1/(C1+C2)]E2, where -E2 is a negative maximum output voltage of the amplifier 4. Thus, the threshold voltage is stably obtained.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62167686A JPS6412614A (en) | 1987-07-07 | 1987-07-07 | Voltage comparator circuit having hysteresis |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62167686A JPS6412614A (en) | 1987-07-07 | 1987-07-07 | Voltage comparator circuit having hysteresis |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6412614A true JPS6412614A (en) | 1989-01-17 |
Family
ID=15854348
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62167686A Pending JPS6412614A (en) | 1987-07-07 | 1987-07-07 | Voltage comparator circuit having hysteresis |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6412614A (en) |
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7141088B2 (en) | 2001-08-08 | 2006-11-28 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus |
-
1987
- 1987-07-07 JP JP62167686A patent/JPS6412614A/en active Pending
Cited By (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US7141088B2 (en) | 2001-08-08 | 2006-11-28 | Toyota Jidosha Kabushiki Kaisha | Exhaust gas purifying apparatus |
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