This paper suggests the parameters of the requirement conditions of minimum performance for a RF transceiver system design from the specifications of IEEE Std 802.11b and IEEE Std 802.11a. It has yielded the requirement conditions of minimum performance in the design process due to these parameters. A RF transceiver system is simulated by using Agilent ADS(Advanced Design System) after selecting the components of optimal conditions to fabricate the RF transceiver system. The results of both the analysis and the simulation will be used for a real wireless LAN design.