半导体学报（英文版）2012，Vol.33Issue(10)：66-71,6.DOI:10.1088/1674-4926/33/10/105002
A high linearity downconverter for SAW-less LTE receivers
A high linearity downconverter for SAW-less LTE receivers
摘要
Abstract
This paper presents a high linearity downconverter implemented in a 0.18μm CMOS process for long term evolution (LTE) receivers without a surface acoustic wave (SAW) filter.The proposed downconverter is composed of a transconductance (Gm) stage,a passive mixer,a current buffer,a transimpedance (TIA) stage,and a DC-offset cancellation (DCOC) loop.The current buffer is utilized to provide very low load impedance for the passive mixer at high frequencies and reduce the output voltage swing induced by out-of-band blockers.This technique improves the input referred third-order intercept point (IIP3) and second-order intercept point (IIP2) of the down-converter by 4.5 dB and 11 dB,respectively.The measured results show that the proposed downconverter achieves a voltage conversion gain of 29.5 dB,double sideband noise figure of 12.7 dB,out-of-band IIP3 of 13 dBm and IIP2 of more than 62 dBm.关键词
linearity/ downconverter/ long term evolution (LTE)/ passive mixer/ radio-frequency (RF) receiversKey words
linearity/ downconverter/ long term evolution (LTE)/ passive mixer/ radio-frequency (RF) receivers引用本文复制引用
Jiang Peichen,Guan Rui,Wang Wufeng,Chen Dongpo,Zhou Jianjun..A high linearity downconverter for SAW-less LTE receivers[J].半导体学报（英文版）,2012,33(10):66-71,6.基金项目
Project supported by the National High Technology Research and Development Program of China (No.2009AA011608) and the National Major Science and Technology Projects Program of China (No.2009ZX03002-004-02). （No.2009AA011608）
