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CMOS current reference with temperature compensation

Current reference is an essential building block in all analog-mixed signal integrated circuits. Basic current references are sensitive to temperature variations, and may vary up to ±30% for a temperature range -30 °C to 135°C. This paper, suggests a technique of combining two current reference models with complementary temperature characteristics, to improve stability of the reference current to 1.14% for the full range of temperature variation; and a dynamic variation which is below 57ppm/ °C. The circuit is designed for a current reference of 5μA for 180nm CMOS technology and Physical design (Layout) is simulated for a temperature range of -30°C to 135 °C across process corners.