A Novel Full Differential Feedforward Fourth-Order Bandpass Sigma-Delta Modulator  

作　　者：Jia-Jun Zhou Hong-Lin Xu Rui Zhang Xiao-Wei Liu 

机构地区：[1]Micro Electromechanical System Center,Harbin Institute of Technology [2]Key Laboratory of Micro-Systems and Micro-Structures Manufacturing,Ministry of Education

出　　处：《Journal of Harbin Institute of Technology(New Series)》2013年第5期123-128,共6页哈尔滨工业大学学报（英文版）

基　　金：Sponsored by the National Basic Research Program of China(Grant No.2012CB934104)

摘　　要：In this paper,in order to reduce power consumption and chip area,as well as to improve the performance of the bandpass sigma-delta modulator,a novel full differential feedforward fourth-order bandpass sigma-delta modulator was proposed. It used a resonator based on Salo architecture,which employed doublesampling and double-delay technique. The results show that the proposed modulator can achieve lower power consumption and a lower capacitive load than the conventional bandpass modulators on the platform of Simulink. The circuit is implemented with TSMC0. 18 μm CMOS process and operates at a sampling frequency of 20 MHz, 80 MHz effective sampling frequency. Furthermore,it consumes 21. 2 mW from a 1. 8 V supply. The simulated peak signal-to-noise ratio( SNR) is 85. 9 dB and the dynamic range( DR) is 91 dB with 200 kHz bandwidth.In this paper, in order to reduce power consumption and chip area, as well as to improve the performance of the bandpass sigma-delta modulator, a novel full differential feedforward fourth-order bandpass sigma-delta modulator was proposed. It used a resonator based on Salo architecture, which employed double- sampling and double-delay technique. The results show that the proposed modulator can achieve lower power consumption and a lower capacitive load than the conventional bandpass modulators on the platform of Simulink. The circuit is implemented with TSMC0. 18 ixm CMOS process and operates at a sampling frequency of 20 MHz, 80 MHz effective sampling frequency. Furthermore, it consumes 21.2 mW from a 1.8 V supply. The simulated peak signal-to-noise ratio （SNR） is 85.9 dB and the dynamic range （DR） is 91 dB with 200 kHz bandwidth.

关 键 词：BANDPASS SIGMA-DELTA MODULATOR DOUBLE-SAMPLING 

分 类 号：TN47[电子电信—微电子学与固体电子学]