数字中频接收机的设计与实现

数字中频接收机(DIFR)是对中频信号直接采样，其信道化功能由数字正交下变频器和数字滤波器来实现。因此，DIFR适用于接收和处理多载波、多模式信号，可解决很多种信号之间的互通互连问题。本文基于DIFR对动态范围、带宽、自动增益控制和高速信号采集等技术需求，优化设计了一种大动态宽带DIFR，给出了该系统的实现方案、各部分的参数分配及系统设计指标；给出了一种新型的数字自动增益控制(DAGC)实现电路，并提出了其控制算法。

Design and Implementation of a Digital Intermediate Frequency Receiver

Digital Intermedeate Frequency(IF) Receivers(DIFRs) are directly to sample intermediate frequency signal. Their channellized function is achieved by digital quadrant down conversion and digital filtering. DIFRs can receive and process multi-carrier and multi-mode signals, so it can be used to solve the intercommunication problems of these signals. This paper introduces the design of a large dynamic and broad band DIFR, and presents the actual project and key specifications of the IF low noise amplifier,digital automatic gain control (DAGC) ,digital down conversion and digital filter, and provides the control algorithm of DAGC.