Analysis and design of Chopperless 7 ppm/°C Bandgap Voltage Reference

A curvature-compensated bandgap voltage reference circuit that generates 1.317 V from a 1.8V supply is presented in this paper. The PTAT voltage generated in the proposed architecture is the sum of the difference in the gate-source voltage of weakly inverted MOS transistors and the difference in the emitter-base voltages of bipolar. This results in inherently higher PTAT voltage generation. Furthermore, this architecture significantly eases the opamp's requirements on offset and flicker noise and doesn’t require sophisticated techniques, such as chopping. A novel curvature compensation scheme is proposed and validated across PVT simulations and achieves 7 ppm/°C with a single point trim. The proposed bandgap consumes a current of 90 μA from 1.8V supply and occupies an area of 0.0125 mm
²
in TSMC 65nm.