Resistive Calibrated Zero Temperature Coefficient Band Gap Reference (BGR)

Abstract

This work presents a comprehensive analysis and design of Band-Gap Reference Circuits. The voltage mode BGR inherently not capable of generating reference voltages less than 1.2 V. Thus, to generate sub 1 V reference voltages, Current Mode BGR is employed. Here, a reference voltage of 0.994 V is being generated. A new start-up circuit has also been designed to pullout the BGR from unwanted-stuck operating points and start the BGR to work at stable operating points. Trimming or Programmability has also been added to achieve precise reference voltage across different corners. Also, modifications are done to improve the transient response of the BGR too. Overall, the best temperature co-efficient achieved is about 8.37 ppm/°C for the temperature range of −40°C to 125°C with UMC 180 nm technology. Output reference voltage variation is also decreased to 1.3 mV.