A resistorless CMOS current reference with temperature compensation

摘要

A resistorless CMOS current reference is presented. Temperature compensation is achieved by sub-tracting two sub-currents with different positive temperature coefficients. The circuit has been implemented with a Chartered 0.35 μm CMOS process. The output current is 1.5 μA, and the circuit works properly with a supply volt-age down to 2 V. Measurement results show that the temperature coefficient is 98 ppm/℃, and the line regulation is 0.45%/V. The occupied chip area is 0.065 mm~2.