A low power op-ampless bandgap reference with second-order compensation

An op-ampless second-order compensated bandgap reference with low temperature coefficient is proposed in this paper. The bandgap is second-order curvature-compensated by the temperature coefficient of the threshold voltage of a MOSFET. Simulated by Spectre, the output reference voltage is 1.102V with a 2.7ppm temperature coefficient from -40 °C to 160 °C and a -60dB PSRR at low frequency. The current dissipation of the whole circuit is 16μA. The layout area is 0.029mm².