A new high performance bandgap reference

A new high performance CMOS bandgap reference (BGR) is designed and implemented in 0.18um CMOS technology. The proposed BGR circuit uses weak inversion technology to generate complementary-to-absolute temperature current and add the proportional-to-absolute temperature current into a transistor to generate the reference voltage. The output reference voltage can be adjusted by change the value of the last resistor. In this paper, the BGR circuit generates reference voltage of 1.66v and 825mV respectively at supply voltage of 3.5V with different resistor value at the end of the bandgap reference. Experimental results show that the temperature coefficient is 48.7ppm/°C between -10°Cto 100°C and the power supply rejection ratio (PSRR) can reach the 76dB in the low frequency range. This voltage reference has been successfully applied in a 4 white LED backlight driver chip.