A novel piecewise curvature-corrected CMOS bandgap reference

A novel and simple piecewise curvature-corrected bandgap voltage reference (BGR) is proposed. It features in employing temperature-dependent resistor ratio to get a piecewise corrected current, which corrects the nonlinear temperature dependence of the first-order BGR. The piecewise corrected current generator forms a negative feedback to improve the line regulation and power supply rejection (PSR) of the proposed BGR. Simulation result shows the temperature coefficient (TC) of 5ppm/K in the industry temperature range (223–398K) and PSR of −82dB are achieved at 2.6-V supply voltage. The simulated line regulation is 0.6mV/V in the supply range of 2.6V–5.6V. It is designed in SMIC 0.35-μm 5-V n-well digital CMOS process.