A 5.16 ppm/°C high precision bandgap reference with no amplifiers

Abstract A high precision bandgap voltage reference for the electric vehicle battery monitoring and management integrated circuit is proposed in this paper. Wilson current mirrors are used instead of operational amplifiers as clamping potentials in the circuit, which can also reduce noise and power consumption. High-order curvature compensation and linearization compensation are applied to decrease the temperature coefficient at high temperatures. The simulation results indicate that the average temperature coefficient is 5.16 ppm/°C from -40°C to 125°C. The output reference voltage can achieve 13.4 μV (rms) noise from 0.1 Hz to 10 Hz. The proposed circuit consumes 73.6 μA and occupies 0.033 mm 2 at 1.8 V supply voltage.