基于TD-LTE终端的连续时间ΣΔADC的设计

摘要

A continuous-time ΣΔADC based on TD-LTE terminals is implemented with 0.13-μm CMOS process to address the power consumption issue of TD-LTE terminals.The low-pass filter in conventional receiver is removed to save power consumption by using the proposed ADC.The proposed ADC is with 3 rd loop filter,3 bit quantizer,and compensates excess loop delay (ELD)in a compact way.The test results show the ADC achieves 66 dB dynamic range in TD-LTE 20 MHz bandwidth,with 25.1 mA current con-sumption.%为了降低TD-LTE终端功耗，采用0.13-μm CMOS工艺实现了一款基于TD-LTE终端的连续时间ΣΔADC。采用该ADC的TD-LTE接收机省去了传统接收机中的低通滤波器，节省了功耗。该ADC采用了3阶、3位量化的结构，并用较简单的方法实现了多余环路延迟（ELD）的补偿。该ADC的硅片测试结果显示在TD-LTE的20 MHz带宽下实现了66 dB的动态范围，功耗为25.1 mA。