A Multirate Low Power Sigma Delta Modulator for Multi-Standard Mobile Terminals
A new low power multimode switchedcapacitor sigma delta modulator (SDM) architecture for wireless communication receivers is proposed in the paper. The proposed modulator uses a cascade 211 topology with singlebit quantizer for stability and inherent linear. The doublesampling SDM and multirate SDM are incorporated together to reduce the slewrate of the operational amplifier (OPAMP) and power dissipation. The lowdistortion swingsuppressing technique is used to decrease the inband harmonic distortion. The effects of circuit nonidealities on the modulator performance are discussed. A peak SNR of 85/ 82/ 66/ 63/ 56/ 48 dB is achieved over a 0.2/ 1/ 2/ 3.84/ 22/ 28 MHz channel bandwidth for GSM/ Bluetooth/ GPS / WCDMA/ WLAN/ WiMAX mode. The simulation results demonstrate that the proposed modulator structure fulfills the performance requirements of the above mentioned mobile communication standards and confirm the effectiveness of the proposed scheme.
sigmadeltamodulator multi-rate doublesamplingtechniques multi-standardwirelessreceivers lowpowerelectronics
Cao Shun Li Jinfeng Wang Ying
College of information engineeringShenyang university of chemical technologyShenyang, China College of information engineering Shenyang university of chemical technology Shenyang, China
国际会议
广州
英文
1-4
2011-05-13（万方平台首次上网日期，不代表论文的发表时间）