A 1-V 92.28-dB DR Sigma-Delta Modulator for Sensing Applications

A Sigma-Delta modulator implemented in a 180 nm CMOS process is proposed with a supply voltage of 1 V. The modulator is targeted at sensing applications. The design of the modulator is optimized to achieve minimum power consumption and area. A larger signal input range at low voltage can be obtained by using rail-to-rail folded cascode amplifiers. 1/f noise in the low frequency band and modulator input offset are reduced using a chopper-stabilization technique. A dynamic range of 92.28 dB is achieved by the Sigma-Delta modulator over a 100 Hz signal bandwidth. The modulator core area is 0.1482 mm
²
and power consumption is 35 $\mu$W.