CMOS Bandgap Reference and Current Reference ...

This paper presents a CMOS bandgap reference and current reference based on the resistor compensation. The proposed architecture consists of various high positive temperature coefficient (TC) resistors, a two-stage operational transconductance amplifier (OTA) and a simplified start-up circuit in 0.35-um CMOS process. In the proposed bandgap reference and current reference, numerous compensated resistors, which have a high positive temperature coefficient (TC), are added to the parasitic n-p-n and p-n-p bipolar junction transistor devices, to generate a temperature-independent voltage reference and current reference. With the simplified start-up circuit, the proposed resistor-compensation bandgap reference and current reference can be started at 43 ns at a minimum supply voltage of 1.35 V. The measurements verify the current reference of 735.6 nA, the voltage reference of 888.1 mV, and the power consumption of 91.28 uW at a supply voltage of 3.3 V. The voltage TC is 49 ppm/℃ in the temperature range from 0oC to 100oC and 12.8 ppm/℃ from 30oC to 100oC. The current TC is 119.2 ppm/℃ at temperatures of 0oC to 100oC. Measurement results also demonstrate a stable voltage reference at high temperature (> 30oC), and a constant current reference at low temperature (< 70oC).