A reconfigurable active-G_m-RC filter formultistandard wireless receivers  

作　　者：樊祥宁 Bao Kuan Tang Li Liu Junbo Gu Chengjie 

机构地区：[1]Institute of RF-&OE-ICs,School of Information Science and Engineering,Southeast University

出　　处：《High Technology Letters》2015年第2期119-126,共8页高技术通讯（英文版）

基　　金：Supported by the National Basic Research Program of China(No.2010CB327404);the Priority Academic Program Development of Jiangsu Higher Education Institutions

摘　　要：A 4th-order low-pass filter （LPF） based on active-Gm-RC structure for multi-standard system application is presented in this paper. The performances of LPF are controlled by a 1-bit control- voltage, and the cut-off frequency, channel selectivity, and linearity of the proposed filter can be reconfigured accordingly. In order to improve the accuracy of the cut-off frequency, a binary-weigh- ted switched-capacitor array is employed as the auto-tuning circuits to calibrate the RC-time con- stant. Fabricated in TSMC 0. 18μm RF CMOS process, the proposed LPF achieves a measured cutoff frequency of 1.95 and 12.3MHz for WCDMA and GPS/Galileo application with a bandwidth de viation less than 4%. The measured l dB compression points are -3.0dBm and -5.1 dBm respectively for different modes. The core circuit of LPF consumes l mW and 1.6mW for WCDMA and GPS/Galileo respectively. And the proposed LPF occupies an area of 0.78ram2.A 4^(th)-order low-pass filter(LPF) based on active-G_m-RC structure for multi-standard system application is presented in this paper.The performances of LPF are controlled by a 1-bit controlvoltage,and the cut-off frequency,channel selectivity,and linearity of the proposed filter can be reconfigured accordingly.In order to improve the accuracy of the cut-off frequency,a binary-weighted switched-capacitor array is employed as the auto-tuning circuits to calibrate the RC-time constant.Fabricated in TSMC 0.18μm RF CMOS process,the proposed LPF achieves a measured cutoff frequency of 1.95 and 12.3MHz for WCDMA and GPS/Galileo application with a bandwidth deviation less than 4%.The measured 1dB compression points are-3.0dBm and-5.1dBm respectively for different modes.The core circuit of LPF consumes 1mW and 1.6mW for WCDMA and GPS/Galileo respectively.And the proposed LPF occupies an area of 0.78mm^2.

关 键 词：low pass filter （LPF） MULTI-STANDARD active-Gm-RC AUTO-TUNING WCDMA GPS GALILEO RECONFIGURABILITY 

分 类 号：TN713[电子电信—电路与系统]