2.4GHz WLAN RF Front-End Circuit Design

This thesis mainly discusses a WLAN receiver working at ISM band--2.4GHz,it focuses on the architecture of RF front-end circuit and budget of RX link. In this thesis, modules of receiver RF front-end are simulated: antenna, LNA, mixer working at this band are fulfilled, and their performances are tested. Meanwhile, the whole receiver is simulated though the total system hasn't been fulfilled, this paper also estimates the performance of the receiver system.The first chapter is an introduction. It demonstrates the history and development of WLAN. The second chapter mainly discusses RF parameters related to IEEE802.11b WLAN such as S parameter, Noise Figure, ldB compression point, third intercept point, etc. The third chapter incorporates the intern experience of the author at Motorola Electronics Limited(Beijing) NTWS RF Department CDMA team, and introduces the test method of parameters which are talked about in chapter 2.Chapter 4 introduces general receiver architectures and analyzes the difference of different kinds of receivers. General methods to improve performance of receiver are listed. It focuses on superdyne receivers. The fifth chapter simulates the receiver which is designed in this paper using ADS.RX link budget is also done in this chapter, and simulation results are brought forward. The last chapter fulfilled three modules of the receiver: LNA, antenna and the mixer test results are listed in detail.