Title :
A high-linearity receiver RF front-end with a high-performance 25%-duty-cycle LO generator for WCDMA/GSM applications
Author :
Hu, Song ; Li, Weinan ; Huang, Yumei ; Hong, Zhiliang
Author_Institution :
State Key Lab. of ASIC & Syst., Fudan Univ., Shanghai, China
fDate :
Nov. 30 2011-Dec. 2 2011
Abstract :
A fully integrated receiver RF front-end that meets the 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 LO generator with low phase noise is proposed to provide the 4-phase 25%-duty-cycle clocks. This RF front-end is integrated in a receiver with an on-chip frequency synthesizer in 0.13μm CMOS. The measurement results show that, the receiver achieves -6dBm IIP3 and at least +60dBm IIP2 for all modes and bands.
Keywords :
CMOS integrated circuits; cellular radio; code division multiple access; frequency synthesizers; low noise amplifiers; mixers (circuits); phase noise; radio receivers; surface acoustic wave filters; CMOS; GSM; RF front end receiver; SAW; WCDMA; capacitive desensitization; current mode passive mixers; duty cycle LO generator; multi-gated LNA; on-chip frequency synthesizer; phase noise; size 0.13 mum; Calibration; GSM; Mixers; Multiaccess communication; Radio frequency; Receivers; Spread spectrum communication; 25% duty-cycle; GSM; RF front-end; Receiver; WCDMA; divider; high linearity;
Conference_Titel :
Radio-Frequency Integration Technology (RFIT), 2011 IEEE International Symposium on
Conference_Location :
Beijing
Print_ISBN :
978-1-4577-0517-5
DOI :
10.1109/RFIT.2011.6141792
