JPS6432517A - Time constant circuit - Google Patents
Time constant circuitInfo
- Publication number
- JPS6432517A JPS6432517A JP62188504A JP18850487A JPS6432517A JP S6432517 A JPS6432517 A JP S6432517A JP 62188504 A JP62188504 A JP 62188504A JP 18850487 A JP18850487 A JP 18850487A JP S6432517 A JPS6432517 A JP S6432517A
- Authority
- JP
- Japan
- Prior art keywords
- circuit
- capacitor
- constant current
- voltage
- connecting point
- 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 form a time constant circuit with stability independently of voltage fluctuation by using a compensation circuit so as to make potentials at an input terminal and an output terminal of a current mirror circuit inverting a constant current equal to each other and supplying a constant current to a capacitance. CONSTITUTION:A constant current depending on a resistive element 1 is inputted from a connecting point 9 to a current mirror circuit 3 and outputted to a connecting point 10 while being inverted. A voltage at connecting points 9, 10 is given to a compensation circuit 4. The circuit 4 compares the inputted voltages to apply differential control to the voltage at the connecting point 10 via the circuit 3. When the connecting points 9, 10 reach an equi-potential, a constant current charges a capacitor 5 via the circuit 4 from the circuit 3. In giving a high level reset signal from a control circuit 7 to discharge the capacitor 5, an input terminal 11 reaches a high level. The circuit 7 sends a reset signal retarded for a prescribed time and inverted into a low level to the capacitor 5. Then the charging of the capacitor 5 is started by a constant current. The delay time depends only on the resistive element 1 and the capacitor 5 and stable time constant is obtained without being affected by the power voltage or a threshold voltage.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62188504A JPS6432517A (en) | 1987-07-27 | 1987-07-27 | Time constant circuit |
Applications Claiming Priority (1)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
JP62188504A JPS6432517A (en) | 1987-07-27 | 1987-07-27 | Time constant circuit |
Publications (1)
Publication Number | Publication Date |
---|---|
JPS6432517A true JPS6432517A (en) | 1989-02-02 |
Family
ID=16224882
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
JP62188504A Pending JPS6432517A (en) | 1987-07-27 | 1987-07-27 | Time constant circuit |
Country Status (1)
Country | Link |
---|---|
JP (1) | JPS6432517A (en) |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0438136U (en) * | 1990-07-30 | 1992-03-31 | ||
JP2014033425A (en) * | 2012-07-31 | 2014-02-20 | Samsung Electro-Mechanics Co Ltd | Oscillator |
Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54136261A (en) * | 1978-04-14 | 1979-10-23 | Nec Corp | Current inversion circuit |
JPS56162517A (en) * | 1980-05-20 | 1981-12-14 | Nec Corp | Current miller circuit |
JPS62119A (en) * | 1985-06-26 | 1987-01-06 | Nec Corp | One-terminal oscillator |
JPS62149215A (en) * | 1985-12-23 | 1987-07-03 | Nec Corp | Time constant circuit |
-
1987
- 1987-07-27 JP JP62188504A patent/JPS6432517A/en active Pending
Patent Citations (4)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPS54136261A (en) * | 1978-04-14 | 1979-10-23 | Nec Corp | Current inversion circuit |
JPS56162517A (en) * | 1980-05-20 | 1981-12-14 | Nec Corp | Current miller circuit |
JPS62119A (en) * | 1985-06-26 | 1987-01-06 | Nec Corp | One-terminal oscillator |
JPS62149215A (en) * | 1985-12-23 | 1987-07-03 | Nec Corp | Time constant circuit |
Cited By (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
JPH0438136U (en) * | 1990-07-30 | 1992-03-31 | ||
JP2014033425A (en) * | 2012-07-31 | 2014-02-20 | Samsung Electro-Mechanics Co Ltd | Oscillator |
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