A WLAN/WMAN Dual Mode Transceiver System for Indoor/Outdoor Application

Abstract

WLAN(IEEE 802.11a)/WMAN(IEEE 802.16a) dual mode transceiver chip has been proposed, designed and fabricated. Transceiver RF IC chip with packaged size of 6mm*6mm was fabricated using 0.25 um SiGe BiCMOS process. Power amplifier and PLL/VCO chip were fabricated using the same process. Ceramic front-end filter were also fabricated for WLAN/WMAN frequencies. To make compact transceiver system, these chips was mounted on 2 cm*2 cm double side PCB.The full system has been tested with external ADC/DAC and baseband modem. The measured results show that fabricated transceiver system meets the requirements for WLAN/WMAN standards. Index Terms-WLAN/WMAN, dual mode, transceiver system, RF IC

Attendance management system

“…To provide user interface Liquid Crystal Display (LCD)-016M002B of VISHAY was connected [8]. For transmitting data from the handheld devices network to local Raspberry Pi web server wirelessly XBee XB24-Z7WIT-004 from DIGI was used [9], [10]. The main benefits of using ZigBee XBee was its third-party device support and low power requirements.…”

2×2 MIMO, multi-mode, wideband transceiver system for worldwide m-WiMAX (IEEE 802.16e) / WLAN (IEEE 802.11n) applications

“…This shift is caused by the growth of wireless communications to include a common vision of the fourth generation of mobile communications, ubiquitous information access, higher data rates and higher mobility. To deal with this change in the communication environment, development of multi-band RF technology is necessary [1][2][3][4][5].…”