A CMOS piecewise curvature-compensated voltage reference

This paper presents a novel approach to the design of a high-precision CMOS voltage reference. The proposed circuit utilizes MOS transistors instead of bipolar transistors to generate positive and negative temperature coefficient (TC) currents summed up to a resistive load to generate low TC reference voltage. A piecewise curvature-compensation technique is also used to reduce the TC of the reference voltage within a wider temperature range. The output reference voltage can be adjusted in a wide range according to different system requirements by setting different parameters such as resistors and transistor aspect ratios. The proposed circuit is designed for TSMC [email protected] standard CMOS process. Spectre-based simulations demonstrate that the TC of the reference voltage is 4.3ppm/^oC with compensation compared with 107ppm/^oC without compensation in the temperature ranges from -15 to 95^oC using a 1.5V supply voltage.

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