Patent ID: 6906651

Claim:
A constant current source with threshold voltage and channel length modulation, comprising: a first MOS transistor including a gate terminal, a first terminal and a second terminal; a second MOS transistor including a gate terminal, a first terminal and a second terminal, wherein the second terminal is coupled to the first terminal of the first MOS transistor; a third MOS transistor including a gate terminal, a first terminal and a second terminal, wherein the gate terminal and the first terminal are coupled to the gate terminal of the second MOS transistor, a fourth MOS transistor including a gate terminal, a first terminal and a second terminal, wherein the gate terminal and the first terminal are coupled to the gate terminal of the first MOS transistor and the second terminal of the third MOS transistor, and the second terminal is coupled to a first reference voltage; and a fifth MOS transistor acting as a resistor and electrically connected to the gate terminal and the first terminal of the third MOS transistor.