A linearized VBE bandgap voltage reference with wide temperature range

This paper has presented a structure for bandgap reference with wide operating range of temperature by adopting high precision subtractor to eliminate the non-linearization of the TC (temperature coefficient) of V_BE. Firstly with the adoption of the technique of curvature compensation, a current with zero TC is obtained. Upon this with the use of subtractor the linearized V_BE is achieved. Furthermore, a mixed topology for the output is adopted to add the linearized V_BE to the PTAT (proportional to abstract temperature) voltage so as to obtain an adjustable output voltage. This bandgap based on the process of 0.6μm BiCMOS demonstrates a TC (temperature coefficient) of 4.21ppm/°C within the temperature of -50~140°C with the supply voltage of 3.3V and the output voltage of 1V.