JPS579106A - Failure detecting circuit for operational amplifier - Google Patents
Failure detecting circuit for operational amplifierInfo
- Publication number
- JPS579106A JPS579106A JP7393780A JP7393780A JPS579106A JP S579106 A JPS579106 A JP S579106A JP 7393780 A JP7393780 A JP 7393780A JP 7393780 A JP7393780 A JP 7393780A JP S579106 A JPS579106 A JP S579106A
- Authority
- JP
- Japan
- Prior art keywords
- voltage
- operational amplifier
- failure
- millivolts
- several tens
- 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.)
- Granted
Links
Classifications
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/52—Circuit arrangements for protecting such amplifiers
Landscapes
- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
- Testing Electric Properties And Detecting Electric Faults (AREA)
Abstract
PURPOSE:To simplify the failure detection even for an operational amplifier in any application, by detecting a voltage between input terminals exceeding a prescribed value, as a failure. CONSTITUTION:A failure detection circuit 5 consists of the 1st voltage comparator 6 outputting a pulse signal of logical 1 when a minus input terminal voltage of an operational amplifier 2 exceeds a value added by several tens of millivolts to a plus input terminal voltage, the 2nd voltage comparator 7 outputting a pulse signal in logical 1 when the minus terminal voltage of the operational amplifier 2 is lower than the plus terminal voltage subtracted by several tens of millivolts, and logical sum circuit 8 obtaining the logical sum of both the comparators 6 and 7. Further, the amplifier 2 is in normal operation, the voltage between the input terminals is approximately zero, and on the other hand, if in failure, the zero voltage cannot be kept. If the voltage difference between the input terminals of the amplifier 2 exceeds + or - several tens of millivolts, it is detected as a failure.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7393780A JPS579106A (en) | 1980-05-30 | 1980-05-30 | Failure detecting circuit for operational amplifier |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP7393780A JPS579106A (en) | 1980-05-30 | 1980-05-30 | Failure detecting circuit for operational amplifier |
Publications (2)
Publication Number | Publication Date |
---|---|
JPS579106A true JPS579106A (en) | 1982-01-18 |
JPH026245B2 JPH026245B2 (en) | 1990-02-08 |
Family
ID=13532523
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP7393780A Granted JPS579106A (en) | 1980-05-30 | 1980-05-30 | Failure detecting circuit for operational amplifier |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS579106A (en) |
-
1980
- 1980-05-30 JP JP7393780A patent/JPS579106A/en active Granted
Also Published As
Publication number | Publication date |
---|---|
JPH026245B2 (en) | 1990-02-08 |
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