适用于TD-SCDMA/TD-LTE协议发射机的可变带宽低通滤波器  

A Tunable Bandwidth Low-pass Filter for TD-SCDMA/TD-LTE Transmitter

作　　者：金晨[1] 毛陆虹[1] 谢生[1] 张世林[1] 

机构地区：[1]天津大学电子信息工程学院,天津300072

出　　处：《固体电子学研究与进展》2013年第5期441-446,共6页Research & Progress of SSE

基　　金：国家科技重大专项资助项目(2010ZX03007-002-03)

摘　　要：采用UMC 0.18μm CMOS工艺,实现了一种符合TD-SCDMA/TD-LTE协议要求的发射机的可变带宽滤波器,设计选择七阶切比雪夫低通滤波器,采用有源电阻电容(active-RC)全差分滤波器结构,通过一阶滤波器级联三个二阶Tow-ThomasⅡ型滤波器结构构成,用译码器控制电容阵列调节带宽,带宽设置为1.6MHz、3MHz、5MHz、10MHz和15MHz五种可切换值。滤波器芯片面积为1 059μm×867μm。测试结果表明,在1.8V电源电压下电路功耗为13mA,各个带宽符合设计要求,滤波器二倍频衰减度可以达到50dB以上,线性度指标三阶输入交调点(Input 3rd order intercept point,IIP3)为-4.385dBm。This paper proposes a seven order Chebyshev low-pass filter, which is fabricated in UMC 0. 18 μm CMOS process and used for TD-SCDMA/TD-LTE transmitter. The filter is de- signed as active-RC structure consisting of a first order filter cascaded with three second order Tow-Thomas filters, and uses a decoder to control the tunable bandwidth in 1. 6 MHz, 3 MHz, 5 MHz, 10 MHz and 15 MHz. The chip area is 1 059 μmX867 μm. The test result indi- cates that the current is 13 mA under 1.8 V power supply, and the bandwidths satisfy the design requirements of the protocols. The second frequency attenuation can reachover 50 dB, and the in- put 3rd order intercept point（IIP3） is --4. 385 dBm.

关 键 词：时分同步码分多址 时分长期演进 可变带宽 低通滤波器 

分 类 号：TN713.4[电子电信—电路与系统]