Research And Implementation Of A Low Noise RF Channel Of Miniaturized HF Receiver

Short wave radio can be widely used in military and civil communication, being of great value in research and development.This thesis comes from our company small shortwave radio based on the high-intermediate-frequency digital technology. A channel design is given, to ensure the smooth completion of the task of product development.according to the general technical requirements for the planning and design of the system, complete the design of receiver. To analysis and understand this system, the overall framework and function of the system unit implementation are discussed, designing each functional circuit in this thesis. The specific circuit design, PCB board design and debugging of the unit, debugging of system are realized, the function and system parameters, and measure the system parameters are realized.By testing the system, this paper presents the design scheme in this thesis can meet the technical requirements, reduce the complexity of channel, reducing the volume of channel, compared to the two mixing scheme. it has certain advantages. The design in this thesis was applied in a HF communication equipment.