An 80dB Dynamic Range ΣΔ Modulator for Low-IF GSM Receivers  

80dB动态范围,用于低中频结构GSM接收机的ΣΔ调制器(英文)

作　　者：杨培[1] 殷秀梅[1] 杨华中[1] 

机构地区：[1]清华大学电子工程系,北京100084

出　　处：《Journal of Semiconductors》2008年第2期256-261,共6页半导体学报（英文版）

摘　　要：A high-resolution,200kHz signal bandwidth,third-order single-loop single-bit ε△ modulator used in low-IF GSM receivers is presented. The modulator is implemented with fully differential switched capacitor circuits in standard 0. 6μm 2P2M CMOS technology. The modulator uses two balanced reference voltages of ±1V,and is driven by a single 26MHz clock signal. The measurement results show that,with an oversampling ratio of 64, the modulator achieves an 80.6dB dynamic range,a 71.8dB peak SNDR,and a 73.9dB peak SNR in the signal bandwidth of 200kHz. The modulator dissipates 15mW static power from a single 5V supply.介绍了一个200kHz信号带宽、用于低中频结构GSM射频接收机的高精度ΣΔ调制器.该调制器采用3阶单环单比特的结构,电路使用全差分开关电容结构实现,并在0.6μm2P2 M CMOS工艺下流片验证.调制器使用全差分±1 V参考电压,工作在26 MHz采样频率,过采样率为64 .测试结果表明,在200kHz信号带宽内,调制器达到80.6dB动态范围,峰值SNDR达到71.8dB,峰值SNR达到73.9dB.整个调制器电源电压为5 V,静态功耗为15 mW.

关 键 词：sigma-delta modulator analog-to-digital conversion SWITCHED-CAPACITOR operational amplifiers 

分 类 号：TN761[电子电信—电路与系统]