A low temperature drift and low noise curvature-compensated CMOS bandgap reference is proposed. A dual-differential input pair amplifier was employed to add compensation with a high-order term of T ln T to the traditional 1st-order compensated bandgap. To reduce the offset of amplifier and output noise of bandgap reference, input differential pairs are large-sized PMOS. With a low dropout regulator stage, the voltage reference was increased to 3V. The voltage reference's temperature curvature is further corrected by 8-bit resistor trimming network. To avoid degrading the precision, noise performance is properly taken into account. The chip was fabricated by using TSMC's 0.35μm CMOS process. The temperature coefficient was measured only to be 2.1 ppm/°C over −40∼125 °C after trimming. The output noise is 42 μVrms from 0.1Hz to 10Hz.