A 1.2 V bandgap reference with an additional 29.6 ppm/°C temperature stable output current

摘要

This paper presents a precise 1.175 V voltage reference bandgap circuit with an additional temperature compensated current output for DC-DC switch mode converters. The nominal temperature coefficient (TC) of the bandgap voltage is 13 ppm/°C from -40°C to 140°C. With the proposed circuit architecture output voltage deviations as low as ±18 mV (±3 s) from the nominal bandgap voltage are achieved. The reference output current measures 1 μA with a temperature stability of 29.6 ppm/°C. The circuit is designed in a 0.18 μm HV-CMOS process to operate from a 1.8 V supply voltage with a simulated overall current consumption of approximately 50 μA. The proposed bandgap reference circuit occupies a silicon die area of 0.05mm.