摘 要:文章对零中频接收机的直流偏置的产生进行了介绍,然后提出一种静态校准与动态校准相结合的两级直流偏置校准技术,既能消除因设计或工艺偏差造成的固有的直流偏置,也能消除由于实时环境因素造成的直流偏置分量。在保证校准具有较高的精度的同时也具备较高的实时校准能力。
关键词:零中频接收机;直流偏置;静态校准;动态校准
中图分类号:TN851 文献标识码:A 文章编号:2096-4706(2019)10-0038-04
A Technique of DC Offset Calibration in ZIF Receiver
LIANG Xiaofeng1,YE Hui2
(1.Guangzhou Zhono Electronic Technology Co.,Ltd.,Guangzhou 510630,China;
2.Guangzhou Letswin Microelectronics Co.,Ltd.,Guangzhou 510663,China)
Abstract:In this article the causes of DC offset in ZIF receiver is introduced,then a two-step DC offset calibration technique combining static calibration with dynamic calibration is presented. This technique can not only eliminate inherent DC offset caused by mismatch of design or manufacture technology,but also eliminate DC offset caused by real time environment. It can offer either high accuracy or real time cancellation.
Keywords:zero IF receiver;DC offset;static calibration;dynamic calibration
参考文献:
[1] 李智群,王志功. 零中频射频接收机技术 [J]. 电子产品世界,2004(13):69-72.
[2] 王自强,张春,王志华. 无线接收机结构设计 [J]. 微电子学,2004(4):455-459.
[3] Abidi AA. Direct-conversion radio transceivers for digital communications [J]. Solid-State Circuits,IEEE Journal of,1995,3(12):1399-1410.
[4] Yoshida H,Tsurumi H,SUZUKI Y. DC offset canceller in a direct conversion receiver for QPSK signal reception [C]//Personal,Indoor and Mobile Radio Communications,1998. The Ninth IEEE International Symposium on. S.l.:s.n.,1998:1314-1318.
[5] 范俊,李永明. 解决零中频架构直流漂移的自校正方案 [J]. 微电子学,2005(2):114-117.
[6] Elahi I,Muhammad K. IIP2 calibration by injecting dc offset at the mixer in a wireless receiver [J]. IEEE Transactions on Circuits and Systems II:Express Briefs,2007,54(12):1135-1139.
[7] Horlin F,Bourdoux A. Digital Compensation for Analog Front-Ends:A New Approach to Wireless Transceiver Design [M]. S.l.:s.n.,2008.
作者简介:
梁晓峰(1982-),男,汉族,广东广州人,数字IC 设计工程师,电子技术工程师,硕士研究生,研究方向:射频、数字集成电路;
叶晖(1976-),男,汉族,湖南湘阴人,数字IC设计工程师,电子技术工程师,博士研究生,研究方向:射频、数字集成电路。