A nonlinearity correction based mixed mode bandgap reference in 65nm CMOS
Zhu Zhangming · Journal of Circuits and Systems · 2010
Through the review and analysis of two recently reported low temperature coefficient bandgap voltage references, a novel temperature compensation technique is proposed in this paper. With the double-end piecewise nonlinearity correction method, logarithm cancellation technique and the mixed mode output, a bandgap reference (BGR) with high temperature stability is realized based on 65nm CMOS process. This voltage reference has been used in a 65nm CMOS touch screen controller (TSC) and produces an output voltage of about 949mV with 2.5V supply voltage. The output voltage varies by only 0.44mV from -40 ℃ to 125 ℃ , and the temperature coefficient is less than 2.87ppm/℃. The design results show that this BGR is very suitable for high precision SoC applications.