Austin, Texas Silicon Laboratories Inc. has introduced a dual-band RF synthesizer capable of generating high-fidelity RF signals up to 2.5 GHz for third-generation (3G) cell phone handsets and other wireless applications.
The Si4133W is said to meet the synthesizer performance requirements of the wideband code division multiple access (W-CDMA) standard approved for use in 3G cellular systems in Japan next year and in Europe in 2002. W-CDMA can deliver data rates up to 2 Mbits/second, or 10 times faster than current solutions.
Silicon Laboratories CEO Nav Sooch said the Si4133W eliminates the need for VCO modules and as many as 40 external discrete components. It's based on an integer-N phase-locked loop architecture, integrating three PLLs on one CMOS chip, and can reduce board space requirements up to 85 percent over conventional solutions.
Sooch said the part shortens development cycles either by configuring prescaler, loop filter and divider settings automatically or by enabling them to be software-programmed.
The signal output of the Si4133W stabilizes to an accuracy of 0.1 ppm in 200 microseconds to meet the compressed mode requirements of W-CDMA. It performs RF synthesis in two bands (2.3 to 2.5 GHz and 750 MHz to 1.6 GHz), as well as IF synthesis from 62.5 MHz to 1.0 GHz.
The Si4133W RF Synthesizer is priced at $7.50 in quantities of 10,000. Volume production is planned for the first quarter of 2001. An evaluation board, Si4133W-EVB, is currently available for $150.
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EETInfo No. 619