A Wide Input Range, High Power Supply Rejection Bandgap Voltage Reference with Exponential Curvature-Compensate

In this paper, a wide input range, low temperature coefficient (TC), high power supply rejection (PSR) bandgap voltage reference (BGR) for low dropout regulators (LDO) is proposed. This performance is achieved by introducing a pre-regulator circuit, a PSR enhancement stage and an exponential curvature-compensation structure. The bandgap voltage reference is implemented in SMIC 0.18-µm BCD process. Simulation results show that at supply voltages ranging from 4V to 20V, the reference voltage is 1.206V, the temperature coefficient is 5.016ppm/°C, the power supply rejection is −101dB at 1KHz, and the linear regulation ratio is 21.4µV/V.