%0 Journal Article
%T Analysis and design of a high-linearity receiver RF front-end with an improved 25%-duty-cycle LO generator for WCDMA/GSM applications<br>一种带有改进的25%占空比本振产生电路的WCDMA/GSM高线性度接收机射频前端分析与设计
%A Hu Song
%A Li Weinan
%A Huang Yumei
%A Hong Zhiliang
%A <br>胡嵩
%A 李伟男
%A 黄煜梅
%A 洪志良
%J 半导体学报
%D 2012
%I 
%X A fully 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-gm 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 0.13 m 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.
%K receiver
%K multi-mode
%K multi-band
%K SAW-less
%K IP2 calibration
%K 25% duty-cycle<br>WCDMA
%K GSM系统
%K 高线性度
%K 射频前端
%K 接收机
%K 占空比
%K 发生器
%K 设计
%U http://www.alljournals.cn/get_abstract_url.aspx?pcid=5B3AB970F71A803DEACDC0559115BFCF0A068CD97DD29835&cid=1319827C0C74AAE8D654BEA21B7F54D3&jid=025C8057C4D37C4BA0041DC7DE7C758F&aid=4CFB0EE1AD3DD1DFE46836E45B53B66F&yid=99E9153A83D4CB11&vid=27746BCEEE58E9DC&iid=0B39A22176CE99FB&sid=8812F4FAFEA4B438&eid=F3090AE9B60B7ED1&journal_id=1674-4926&journal_name=半导体学报&referenced_num=1&reference_num=25