Analysis Of Receiver’s Electromagnetic Sensitivity And Circuit

With the rapid development of modern wireless communications, the demand of performance for RF receiving system is becoming higher, a receiver with good performance such as low power consumption, high sensitivity, wide dynamic range, etc., is turning into a common pursuit. Therefore, they are the key problems in the study of the issue now and in the future that how to improve the sensitivity of the receiving system while enhancing its accuracy, and make the system possess a large dynamic range and high stability. Meanwhile, improvement for a number of receiver’s performance indicators and common requirements of the receiving system also prove to be the development goals in different application areas.The basic principles and some structures of the receiver are discussed in this thesis, several kinds currently used are brought up to compare the advantages and disadvantages between them, the influence of the receiver’s indicators on its overall performance is assessed and ways to improve these parameters is recommended. Then according to the indicator and topology requirements, a simulation model of the receiver system is established. By means of calculating the model of the receiver’s frequency band selection, channel selection, system gain budgets, IF output and sensitivity, the feasibility of the receiver is verified. The electromagnetic compatibility of a superheterodyne receiver is analyzed. Finally, the basic principles and design methods of the receiver’s key module circuit (a low noise amplifier circuit module and a mixer module) is introduced in detail. The designed circuit and simulated results and presented to verify the effectiveness of the design.