JPS6419809A - Constant current source circuit - Google Patents
Constant current source circuitInfo
- Publication number
- JPS6419809A JPS6419809A JP62176117A JP17611787A JPS6419809A JP S6419809 A JPS6419809 A JP S6419809A JP 62176117 A JP62176117 A JP 62176117A JP 17611787 A JP17611787 A JP 17611787A JP S6419809 A JPS6419809 A JP S6419809A
- Authority
- JP
- Japan
- Prior art keywords
- current
- mirror circuit
- side transistor
- driven
- transistor
- 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
- Amplifiers (AREA)
- Control Of Electrical Variables (AREA)
Abstract
PURPOSE:To generate an output current having a positive temperature characteristic by applying the potential of the mutual connecting point of the driven current side of a first current mirror circuit, and the reference current side of a second mirror circuit to the gate of an electric field effect transistor, and taking out the driven current of a second mirror circuit as an output current. CONSTITUTION:The mutual connecting point potential of the driven side transistor 11d of the mirror circuit 11 and the reference side transistor 20r of the first current mirror circuit 20 is supplied to the gate of the electric field effect transistor 2 and a constant current from the driven side transistor 20d of the second mirror circuit is led out as the output current Ic. A forward voltage as the diode of the reference side transistor has a negative temperature characteristic. The forward voltage of the driven side transistor of the first current mirror circuit has also the negative temperature characteristic. The reference current Ir 1 increases more than an increased part based on the natural temperature coefficient of the reference side transistor to compensate the negative temperature coefficient of a light emitting diode.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62176117A JPS6419809A (en) | 1987-07-15 | 1987-07-15 | Constant current source circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP62176117A JPS6419809A (en) | 1987-07-15 | 1987-07-15 | Constant current source circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| JPS6419809A true JPS6419809A (en) | 1989-01-23 |
Family
ID=16007976
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| JP62176117A Pending JPS6419809A (en) | 1987-07-15 | 1987-07-15 | Constant current source circuit |
Country Status (1)
| Country | Link |
|---|---|
| JP (1) | JPS6419809A (en) |
Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5089452A (en) * | 1989-02-09 | 1992-02-18 | Mitsubishi Gas Chemical Company, Inc. | Method for preparing catalyst precursor for methanol synthesis |
| EP1881391A1 (en) * | 2005-08-17 | 2008-01-23 | Rohm Co., Ltd. | Constant current circuit, and inverter and oscillation circuit using such constant current circuit |
| JP2010165177A (en) * | 2009-01-15 | 2010-07-29 | Renesas Electronics Corp | Constant current circuit |
-
1987
- 1987-07-15 JP JP62176117A patent/JPS6419809A/en active Pending
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5089452A (en) * | 1989-02-09 | 1992-02-18 | Mitsubishi Gas Chemical Company, Inc. | Method for preparing catalyst precursor for methanol synthesis |
| EP1881391A1 (en) * | 2005-08-17 | 2008-01-23 | Rohm Co., Ltd. | Constant current circuit, and inverter and oscillation circuit using such constant current circuit |
| EP1881391A4 (en) * | 2005-08-17 | 2008-04-02 | Rohm Co Ltd | Constant current circuit, and inverter and oscillation circuit using such constant current circuit |
| JP2010165177A (en) * | 2009-01-15 | 2010-07-29 | Renesas Electronics Corp | Constant current circuit |
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