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US 2013/0154604 A1Published application
Reference current generation circuit and reference voltage generation circuit
AssigneeSeiko Instruments Inc.
InventorMasakazu SUGIURA
Life of this patent
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Abstract
Provided are a reference current generation circuit and a reference voltage generation circuit, which have improved response speed when power supply is activated or fluctuates. In order to reduce a load capacitance of an operational amplifier, a transistor for providing a current to a transistor pair having a common gate-source voltage is provided, and the operational amplifier controls an ON-state resistance of the transistor.
Claims5
A reference current generation circuit, comprising:
- a first PN junction;
- a first transistor for causing a current to flow through the first PN junction;
- a first resistor and a second PN junction connected in series;
- a second transistor for causing a current to flow through the first resistor and the second PN junction;
- a first voltage source for supplying a common voltage to gates of the first transistor and the second transistor;
- a first operational amplifier including a first input terminal for inputting a voltage generated in the first PN junction and a second input terminal for inputting a voltage generated in the first resistor and the second PN junction;
- and
- a third transistor including a gate controlled by an output voltage of the first operational amplifier, for supplying a current to the first transistor and the second transistor.
5 more elements
Dependencies are inferred from the claim text.