SUMMARYThis paper presents a fully-integrated RF transceiver operating from 860 to 930 MHz. The device parameters are compliant to the IEEE 802.15.4 standard. The analogue portion of the chip contains a directconversion receiver, a fractional-N PLL, a direct-conversion transmitter and a TR-switch. Digital baseband signal processing as well as MAC support are also implemented on the same chip. Only minimal external components are needed to form a complete wireless network application two low-cost crystals, the PLL loop filter, an antenna and a low-cost 8 bit microcontroller. Therefore, this chip is one of the most integrated 802.15.4 transceiver ICs presented to date. The receiver input sensitivity is À98 dBm. The chip is fabricated in a 0.25 mm CMOS technology with MIM-capacitors, deep n-well and a thick top metal layer.