In this paper a 0.6 V, 14 bit/500 Hz subthreshold inverter-based sigma-delta modulator is proposed. In the first integrator of the modulator, a bootstrap switch is used to accomplish accurate signal sampling. Without ...In this paper a 0.6 V, 14 bit/500 Hz subthreshold inverter-based sigma-delta modulator is proposed. In the first integrator of the modulator, a bootstrap switch is used to accomplish accurate signal sampling. Without a transconductor operational amplifier(OTA), the sigma-delta modulator adopts a cascode inverter in the subthreshold region to save power consumption. The modulator is fabricated with a 0.13μm CMOS mixed-signal process. The experiment results show that with the 0.6 V power supply it achieves a maximum SNDR of 69.7 dB and an ENOB of 11.3 bit, respectively, but only consumes 5.07 μw power dissipation.展开更多
采用0.13μm工艺,设计并实现了一款单端CR型分级的10 bit SAR-ADC。在设计中,CR型分级的采用显著降低了芯片面积,高5位的温度计码控制有效消除时钟溃通等误差,自举开关的设计提高了采样精度,前置放大器的高精度静态比较器有效降低失调...采用0.13μm工艺,设计并实现了一款单端CR型分级的10 bit SAR-ADC。在设计中,CR型分级的采用显著降低了芯片面积,高5位的温度计码控制有效消除时钟溃通等误差,自举开关的设计提高了采样精度,前置放大器的高精度静态比较器有效降低失调、提升了转换精度。设计的ADC内核尺寸为580μm×290μm,后仿真结果显示,在采样率1 MS/s下,输入正弦信号200 kHz时,ENOB可达9.5位,EO=1 LSB。展开更多
基金Project supported by the National Natural Science Foundation of China(No.61704143)the Natural Science Foundation of Fujian Province(No.2018J01566)+1 种基金the Young and Middle-Aged Teacher Education Research Project of Fujian Province(No.JAT170428)the High-Level Talent Project of Xiamen University of Technology(No.YKJ17019R)
文摘In this paper a 0.6 V, 14 bit/500 Hz subthreshold inverter-based sigma-delta modulator is proposed. In the first integrator of the modulator, a bootstrap switch is used to accomplish accurate signal sampling. Without a transconductor operational amplifier(OTA), the sigma-delta modulator adopts a cascode inverter in the subthreshold region to save power consumption. The modulator is fabricated with a 0.13μm CMOS mixed-signal process. The experiment results show that with the 0.6 V power supply it achieves a maximum SNDR of 69.7 dB and an ENOB of 11.3 bit, respectively, but only consumes 5.07 μw power dissipation.
