A Resistorless CMOS Voltage Reference Based on Mutual Compensation of $V_{T}$ and $V_{rm TH}$

摘要

A novel temperature-stable nonbandgap voltage reference without resistors is presented in this brief, which is compatible with standard digital CMOS technology. Two linear-temperature terms, i.e., thermal voltage $V_{T}$ and threshold voltage $V_{rm TH}$, are utilized to realize a low-temperature-dependent voltage reference with a significant reduction of nonlinear temperature terms. A self-biased threshold-voltage extractor circuit without any resistor is used to obtain the $V_{rm TH}$ and bias currents of the whole circuit. Based on ratioed transistors biased in a strong inversion region and the inverse-function technique, a temperature-insensitive gain can be applied to the proportional-to-absolute temperature term in the reference, and a weighted sum of $V_{T}$ and $V_{rm TH}$ is achieved. Experimental results of the proposed voltage reference implemented with a 0.35-$muhbox{m}$ CMOS process demonstrate that the output of voltage reference is 905.5 mV, a temperature coefficient of 14.8 $hbox{ppm}/^{circ}hbox{C}$ with a temperature range of 0 $^{circ}hbox{C}$–100 $^{circ}hbox{C}$ is obtained at a 3.3-V power supply, and a power-supply noise attenuation of 61 dB is achieved without any filtering capacitor while dissipating a maximum supply current of 65 $muhbox{A}$. The active area is $100 muhbox{m} times 100 muhbox{m}$.