CONSTANT CURRENT CIRCUIT
PROBLEM TO BE SOLVED: To provide a constant current circuit which achieve low current consumption even when high power supply voltage is supplied while an additional start circuit occupies small area.SOLUTION: A start circuit is configured with: a first current mirror circuit comprising PNP type tra...
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| Format: | Patent |
| Sprache: | eng |
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| Zusammenfassung: | PROBLEM TO BE SOLVED: To provide a constant current circuit which achieve low current consumption even when high power supply voltage is supplied while an additional start circuit occupies small area.SOLUTION: A start circuit is configured with: a first current mirror circuit comprising PNP type transistors Q1 and Q2; and a second current mirror circuit comprising NPN type transistors Q3, Q4, and a resister R1. In the start circuit, a start circuit comprising a PNP type bipolar transistor Q5 and an N type JFET transistor J1 is provided. |
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