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This paper presents the architecture as well as the circuit implementation of a ZigBee transceiver using 2.45 GHz band, which is compliant with the physical layer of IEEE 802.15.4 standard. A prototypical system and chip has been designed using 0.18-μm CMOS process with core area of 0.16 mm 2 . The simulation results shows the packet error rate is less than 1% given E b /N 0 = 9 dB. The total power consumption is merely 271 μW at a 8.0 MHz system clock.Index Terms -WPAN, ZigBee, matched filter, direct sequence spread spectrum, wireless network