A 1 V Bandgap Reference in 7-nm FinFET with a Programmable Temperature Coefficient and an Inaccuracy of +/- 0.2% from-45 degrees C to 125 degrees C

A 1-V precision voltage reference in 7-nm FinFET CMOS is presented. It allows to control a temperature coefficient of the generated voltage. Proposed trim techniques, favored for short test times, help to achieve good accuracy in spite of the challenges posed by the scaled technology and a 'hostile' SoC environment. Two 2nd-order curvature compensation techniques are implemented to achieve high accuracy. Measurement results show a max inaccuracy of +/- 0.2% with temperature coefficient as low as similar to 6ppm/degrees C over temperature range of 170 degrees C (-45 degrees C to 125 degrees C). Furthermore, the temperature coefficient is digitally programmable between -7 mV/100 degrees C to +8 mV/100 degrees C, thus enabling temperature compensation for various sub-blocks within an FPGA. Line regulation is 0.1%/V. The whole design occupies 0.078 mm(2).