半导体学报2012，Vol.33Issue(2)：96-105,10.DOI:10.1088/1674-4926/33/2/025007
Analysis and design of a high-linearity receiver RF front-end with an improved 25％-duty-cycle LO generator for WCDMA/GSM applications
Analysis and design of a high-linearity receiver RF front-end with an improved 25％-duty-cycle LO generator for WCDMA/GSM applications
摘要
Abstract
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 μm 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-cycleKey words
receiver/ multi-mode/ multi-band/ SAW-less/ IP2 calibration/ 25% duty-cycle引用本文复制引用
胡嵩,李伟男,黄煜梅,洪志良..Analysis and design of a high-linearity receiver RF front-end with an improved 25％-duty-cycle LO generator for WCDMA/GSM applications[J].半导体学报,2012,33(2):96-105,10.基金项目
Project supported by the National Science and Technology Major Project of China (No.2009ZX01031-003-002) and the National High Technology Research and Development Program of China (No.2009AA011605). （No.2009ZX01031-003-002）
