摘要
数字下变频技术是软件无线电的关键技术之一。本文介绍了AD公司新近推出的高性能数字下变频(DDC)器件AD6636的主要特性和工作原理,通过对宽带和窄带信号滤波器的仿真结果,提出了在数字中频接收机(DIFR)的设计中,能够利用AD6636片内高精度的数字正交下变频器和抽取滤波器,同时利用FPGA实现宽带滤波,可以弥补AD6636的宽带滤波性能较差的缺陷,从而实现宽带数字滤波。
Digital down converter technique is one of the key technologies in wideband DIFR, The main features and working principle of AD6636,which is a recently produced digital down converter （DDC） of AD Company with better performance,is described in this paper. According to computer simulations about filter of wideband and narrowband signals,this paper proposes one method based on high precision digitial quadrature down converter and decimating filter of AD6636,and FPGA at the same time to achieve the filter of wideband signal in design of a wideband digital intermediate frequency receiver,which could remedy the shortage of AD6636 about the filter of wideband signal. And the filter of wideband digital signal could be carried out.
出处
《现代电子技术》
2005年第23期39-41,共3页
Modern Electronics Technique
