A 1.67-ppm/°C 64-ppm/V curvature-compensated bandgap reference based on a transcendental equation

This paper proposes a current-mode bandgap reference which employs a novel “coarse” voltage replication to offset the 2nd-order curvature due to base-emitter voltage of the BJT. The coarse replication is based on a process insensitive transcendental equation which regulates the independent CTAT current. The bandgap reference which will be implemented in 0.35µm CMOS process has a low operating current of 0.85µA. Under a 2.6V to 4V supply, its line sensitivity is 64ppm/V even in the worst condition, and its TC is only 1.67ppm/°C in the temperature range of −55°C to 115°C.