Analysis and design of a high-linearity receiver RF front-end with an improved 25%-duty-cycle LO generator for WCDMA/GSM applications  

作　　者：Hu Song Li Weinan Huang Yumei Hong Zhiliang 胡嵩;李伟男;黄煜梅;洪志良(State Key Laboratory of ASIC and System,Fudan University,Shanghai 201203,China)

机构地区：[1]State Key Laboratory of ASIC and System,Fudan University,Shanghai 201203,China

出　　处：《Journal of Semiconductors》2012年第2期96-105,共10页半导体学报（英文版）

基　　金：supported by the National Science and Technology Major Project of China(No.2009ZX01031-003-002);the National High Technology Research and Development Program of China(No.2009AA011605)

摘　　要：A rally integrated receiver RF front-end that meets WCDMA/GSM system requirements is presented.It supports SAW-less operation for WCDMA.To improve the linearity in terms of both IP3 and IP2,the RF front-end is comprised of multiple-gated LNAs with capacitive desensitization,current-mode passive mixers with the proposed IP2 calibration circuit and reconfigurable Tow-Thomas-like biquad TIAs.A new power-saving multi-mode divider with low phase noise is proposed to provide the 4-phase 25%-duty-cycle LO.In addition,a constant-g_m biasing with an on-chip resistor is adopted to make the conversion gain invulnerable to the process and temperature variations of the transimpedance.This RF front-end is integrated in a receiver with an on-chip frequency synthesizer in 0.13μm CMOS.The measurement results show that owing to this high-linearity RF front-end,the receiver achieves -6 dBm IIP3 and better than ＋60 dBm IIP2 for all modes and bands.A rally integrated receiver RF front-end that meets WCDMA/GSM system requirements is presented.It supports SAW-less operation for WCDMA.To improve the linearity in terms of both IP3 and IP2,the RF front-end is comprised of multiple-gated LNAs with capacitive desensitization,current-mode passive mixers with the proposed IP2 calibration circuit and reconfigurable Tow-Thomas-like biquad TIAs.A new power-saving multi-mode divider with low phase noise is proposed to provide the 4-phase 25%-duty-cycle LO.In addition,a constant-g_m biasing with an on-chip resistor is adopted to make the conversion gain invulnerable to the process and temperature variations of the transimpedance.This RF front-end is integrated in a receiver with an on-chip frequency synthesizer in 0.13μm CMOS.The measurement results show that owing to this high-linearity RF front-end,the receiver achieves -6 dBm IIP3 and better than ＋60 dBm IIP2 for all modes and bands.

关 键 词：RECEIVER MULTI-MODE MULTI-BAND SAW-less IP2 calibration 25% duty-cycle 

分 类 号：TN851[电子电信—信息与通信工程] TN929.53