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.