Constant current circuit for suppressing transient variation in constant current
AssigneeAblic Inc.
InventorKaoru Sakaguchi
Life of this patent
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Abstract
A constant current circuit includes a first current mirror circuit connected to a first power supply and having a first input transistor and a first output transistor of a first conductivity type, a second current mirror circuit having a second output transistor of a second conductivity type provided between the first input transistor and a second power supply, and a second input transistor of the second conductivity type provided between the first output transistor and the second power supply, a resistor interposed between the second output transistor and the second power supply, and a capacitor having one end connected to the first power supply and the other end connected to a connecting point of the second output transistor and the resistor.
Claims3
A constant current circuit, comprising:
- a first current mirror circuit connected to a first power supply and having a first input transistor and a first output transistor of a first conductivity type;
- a second current mirror circuit having a second output transistor of a second conductivity type provided between the first input transistor and a second power supply, and a second input transistor of the second conductivity type provided between the first output transistor and the second power supply;
- a resistor interposed between the second output transistor and the second power supply;
- and
- a capacitor having one end connected to the first power supply and the other end connected to a connecting point of the second output transistor and the resistor, wherein the capacitor is configured to cancel voltage fluctuations.
Dependencies are inferred from the claim text.