A 8.2ppm/℃ Bandgap Voltage Reference with 1.8V Power Supply in 0.18μm CMOS Process

Bandgap reference is a fundamental component in modern analog/mixed signal integrated circuits.In CMOS process,because of the small β value,the base-emitter path of the bipolar junction transistor has a significant streaming effect on the collector current,which leads to a large drift on temperature for the bandgap reference.In this study,a current compensating technique is proposed to enhance the temperature stability of the bandgap reference,and the power supply rejection is improved with a noise feedback circuit.Experimental results in the 0.18μm CMOS process show that the temperature coefficient is 8.2ppm/℃ within the temperature range of-55℃~150℃ on the 1.8V power supply,and the power supply rejection is greatly improved,the DC power supply rejection ratio is-90dB.