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A fully integrated 2.4 GHz RF transceiver compliant with the low-power ZigBee (IEEE 802.15.4) standard is presented. The RF transceiver adopts low IF receiver and direct up-conversion transmitter. It consumes 18 mA in receive mode and 17 mA in transmit mode with 1.8-V power supply. The receiver chain IIP3 is -13.S dBm and BBA poly phase filter can reject the ACI/AACI interferers. The achieved transmitter's maximum power is 4.7 dBm and its EVM is 8.4% at 0.5 dBm output. The LO generation is achieved using frequency mixing method and thus it can prevent the VCO pulling. The die area is 2.5 mm times 2.6 mm.