This paper presented a novel piecewise curvature-corrected technology

which can be accomplished in standard CMOS process technology without any extra masks for temperature compensation.Temperature coefficient is improved by ten Compared to the first order compensation.This novel curvature-correcting scheme can be used in almost any process technology yielding reliable temperature compensation.The additional circuitry required for this correction is compact and is easily implemented.In SMIC 0.18 μ M CMOS process

a precision piecewise curvature-corrected differential bandgap reference is designed.The simulation results show that differential reference is 1.9997V

total noise is 225nV

and PSRR is 98dB.Meantime

the precision piecewise curvature-corrected single-end bandgap reference implemented in CSMS 0.5 μ M process is embedded in a monolithic 100MHz PWM BUCK DC-DC converter as reference voltage.Experimental results show that reference voltage is 1.2501V

total noise is 670nV

PSRR is 66.7dB

and temperature coefficient is improved by six.Differential or single-end reference can be under 1V through changing parameters due to the current mode

which is adapted to low-voltage low-power portable devices.