应用于无线传感网络SOC的低功耗∑△调制器  

Low Power∑△ Modulator for Wireless Sensor Network SOC

作　　者：马寒玉[1] 马成炎[1,2,3] 叶甜春[1] 

机构地区：[1]中国科学院微电子研究所,北京100029 [2]杭州中科微电子有限公司,浙江杭州310053 [3]嘉兴联星微电子有限公司,浙江嘉兴314000

出　　处：《微电子学与计算机》2013年第9期149-153,共5页Microelectronics & Computer

基　　金：嘉兴市科技计划(2012BZ5006)

摘　　要：提出了一种应用于无线传感网络SOC过采样率(OSR)为128的单环三阶单比特量化∑△调制器.通过采用新型前馈结构,降低了系统对运算放大器性能的要求;通过采用新颖的两级Class A/AB运算放大器实现积分器电路,有效降低了电路的功耗;为了进一步降低电路功耗,对调制器中的第二级、第三级运放进行了缩放.该调制器采用华虹0.18μm CMOS工艺,输入信号带宽为8kHz,工作电压1.8V.后仿真结果表明:在输入信号频率为5kHz、采样时钟为2.048MHz时,调制器的信噪比(SNR)达到96dB,整个调制器的功耗仅为180μW,芯片总面积为0.51mm2.A single-loop third-order single-quantizer Sigma-Delta modulator for wireless sensor network SOC was presented, which used a newly feedforward topology with less demand for operational amplifiers. For reducing the power consumption, a newly two--stage CLASS A/AB OPA was adopted and the OPAs of the second and third stage were scaled. The modulator was implemented in Huahong 0. 18μm CMOS process, and the input signal bandwidth was 8 kHz at oversampling rate （OSR） of 128. The results show that the modulator can achieve a SNR of 96 dB with a 5 kHz input and a 2. 048 MHz sampling clock. The whole modulator dissipates only 180 μW under 1.8V supply voltage, the total area of the chip core is 0. 51 mm2.

关 键 词：∑△调制器 开关电容积分器 A AB类运放 量化器 

分 类 号：TN432[电子电信—微电子学与固体电子学]