Design Of The2.4GHZ Wireless Access Point

Because the WiFi band is a kind of free frequency band without any telecommunication operation license around the world, so WiFi wireless devices provide us a wireless air interface with low cost and high data bandwidth which can be applied all over the world.With the rapid development of the mobile internet, users have higher needs for the mobile high-speed data access. WiFi, as a kind of low cost, high bandwidth wireless technology, gets the scale deployment and the widespread application by the domestic and foreign operators. Additionally, it has played an important role on alleviating the2G/3G data flow pressure.The highest rate of WiFi devices which can meet the agreement of802.1In can be300Mbps, but actually there are many difficulties when we want to achieve such rate. So far, the rate of WiFi products circulated on the market is normally about90Mbps. This paper is based on the study of physical structure theory in WiFi, and carry out a detailed analysis for the circuit structure of2.4GHz wireless access points. Additionally connecting with the signal integrity requirements, analyze the layout and wiring of the PCB layer. Ultimately, it obtains the AP that the signal rate of sending and receiving can be up to94Mbps rate and meet the demand of802.1In protocol. Prepare and write the design of the wireless access point and have an evaluation and demonstration of this program. Select the chip under the comprehensive consideration for many factors such as the design cycle, cost, difficulty and so on. Finally, complete the corresponding circuit design.Design a n type network which aims to reduce the ripple of switching power supply output voltage. The experimental results indicated that3.3V power supply ripple was reduced by64%after joining then type network, and1.5V power supply ripple was reduced by40%. Combined with electromagnetic simulation software and the documents provided by chip manufactures, complete the design of power amplifer and low noise amplifier. And meet the requirements of electromagnetic compatibility and signal integrity, it realizes the layout design of the wireless access point transceiver structure, making the signal transmit-receive rate have improvements in some aspects.