| 改进的基于GSM标准二阶多位噪声耦合过采样调制器 |
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| 引用本文： | 李宏义,王源,贾嵩,张兴.改进的基于GSM标准二阶多位噪声耦合过采样调制器[J].北京大学学报(自然科学版),2012,48(2):200-208. |
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| 作者姓名： | 李宏义 王源 贾嵩 张兴 |
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| 作者单位： | 北京大学微电子研究院器件与线路重点实验室, 北京 100871; |
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| 摘 要： | 提出一个改进的二阶三位噪声耦合过采样调制器, 它将量化器前所有的加法运算移动到第2个积分器的前面, 并通过引入反馈通道和延时输入信号, 使反馈数模转换器的苛刻时序得到缓解。此调制器在0.35m CMOS工艺下设计并生产, 整个调制器使用了两个有源模块。在100 kHz信号带宽和12.8 MHz时钟频率下, 完成了86.4 dB的SNDR和95.8 dB的DR, 3.3 V电源电压下, 消耗9.84 mW。此调制器能满足GSM系统的需求。
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| 关 键 词： | 过采样调制器 噪声耦合 前馈 多位 开关电容线路 |
| 收稿时间： | 2011-03-25 |
Improved 2nd-Order Multi-bit Noise-Coupled Sigma-Delta Modulator for GSM Standard |
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| LI Hongyi,WANG Yuan,JIA Song,ZHANG Xing.Improved 2nd-Order Multi-bit Noise-Coupled Sigma-Delta Modulator for GSM Standard[J].Acta Scientiarum Naturalium Universitatis Pekinensis,2012,48(2):200-208. |
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| Authors: | LI Hongyi WANG Yuan JIA Song ZHANG Xing |
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| Institution: | Key Laboratory of Microelectronic Devices and Circuits, Institute of Microelectronics, Peking University, Beijing 100871; |
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| Abstract: | The authors propose an improved 2nd-order 3-bit noise-coupled SDM in which all the summation before quantizer is moved to the input of the 2nd integrator,and time-constraint of the feedback DAC is relaxed by introducing feedback path and delayed input signal.The modulator was designed and fabricated in a 0.35 μm CMOS process using two active blocks.Under 100 kHz signal bandwidth and 12.8 MHz sampling frequency,86.4 dB SNDR and 95.8 dB DR can be reached dissipating 9.84 mW power from a 3.3 V supply.The modulator can satisfy the requirements of GSM systems. |
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| Keywords: | sigma-delta modulator noise-coupled feedforward multi-bit switched-capacitor circuit |
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