Silicon Wave is developing a combination chip of wireless specification, Bluetooth and IEEE802.11b. The new chip is just like a desktop PC, with USB and Ethernet interfaces, a Bluetooth-like USB, and 802.11b-like Ethernet, according to David L Lyon, chairman and CEO of the firm.

The combo chip has two baseband circuits -- an MAC for 802.11b, and baseband for Bluetooth. When the chip based on the 802.11b MAC controller receives Bluetooth signals, it stops Bluetooth operation with the baseband circuit. The combo chip will be mass-produced from the fourth quarter of 2002.

In the RF circuit, one of the two diversity antennas for 802.11b is used as an antenna for the Bluetooth circuit. The RF chip has an inductor spiral for a balun circuit for a dual differential transformer to antenna, simplifying the external RF circuit. The RF chip is processed with 0.25micron BiCMOS silicon-on-insulator (SoI) technology, offering 30GHz f_T and f_MAX.

(April 2002 Issue, Nikkei Electronics Asia)

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