中文摘要：

介绍了一种低电压Sigma-Delta ADC新结构,该结构采用了二阶单位增益ΣΔ调制器和一阶传统ΣΔ调制器相结合的方式,既可以从系统级降低对运放直流增益等非理想因素的要求,又可以减少加法器的个数、降低电路的复杂度。在此基础上,采用HJTC0.18μm1.8V/3.3V1P6M混合信号工艺,实现了一种1V工作电压的ΣΔ调制器,经测试动态范围可以达到69.5dB。

英文摘要：

A new low voltage sigma delta ADC architecture is presented.With the advantage of both unity gain sigma delta modulator and traditional sigma delta modulator,it relaxes the requirement of the OTA performance and decreases the complex of the circuit.Base on this a sigma delta modulator is implemented with 1 V supply voltage and HJTC 0.18 μm CMOS technology,and the measurement results show that the modulator achieves 69.5 dB DR.