A Sub-lppm/°C Wide-Temperature-Range Bandgap Voltage Reference with Superior-Order Temperature-Curvature Compensation

A stable voltage reference is an eternal subject in the analog field. A bandgap voltage reference (BGR) is proposed in this paper to minimize voltage variations across the high-temperature range of 120°C to 175°C. The main strategy for voltage stability is high-order temperature-curvature compensation with a segmented temperature region. The precise compensation currents are generated with the current subtraction circuit or NMOS transistor operating in the subthreshold region. The chopping technique is used to reduce the 1/f noise and DC offset of the error amplifier. A trimming resistor is used to compensate for the process variation. The proposed 2.5V BGR is designed in a
$0.18\mu\mathrm{m}$
process and the active area is
$1000\times 200\mu \mathrm{m}^{2}$
. The simulation results show that the best temperature coefficient (TC) is 0.33ppm/
^∘
C with 75dB PSRR of DC.