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RF synthesizer includes VCOs

Posted: 11 May 2005 ?? ?Print Version ?Bookmark and Share

Keywords:stmicroelectronics? st? rf synthesizer? voltage controlled oscillator? vco?

STMicroelectronics unveiled a multi-band RF synthesizer with embedded voltage controlled oscillators (VCOs), the first in a series of highly integrated RF solutions integrating PLL and VCOs.

According to the company, they were able to produce the STW81100, which enables a lower BoM and uses a smaller footprint, by leveraging their strong expertise in RF design and utilizing its world class BICMOS SiGe technology. "ST's tremendous RF capabilities and market leadership from handsets to infrastructure has translated into a family of products addressing the two main concerns from manufacturers today: lower BOM and smaller footprint," commented Guillaume Pertinant, RF Technical Marketing Manager of ST's Wireless Infrastructure Division.

Demonstrating high performance, high integration, low power and multi-band capabilities, the STW81100 is a low-cost single-chip alternative to discrete PLL and VCO solutions which typically require two chips and are usually bulky and expensive. The device also leads to an indirect cost reduction as a one-chip approach increases reliability, reduces board space, reduces the number of external discrete components and simplifies sourcing, making it an overall more cost-effective solution, added ST.

Designed for wireless communication and test equipment systems, the new RF device includes an Integer-N frequency synthesizer and two fully integrated VCOs which feature low phase noise performance and a noise floor of -153dBc/Hz. The combination of wide frequency-range VCOs (thanks to center-frequency calibration over 32 sub-bands) and multiple output options (direct output, divided by 2, or divided by 4) allows the synthesizer to cover the 820MHz to 1,100MHz, the 1,640MHz to 2,200MHz and the 3,280MHz to 4,400MHz bands.

The STW81100 is supplied in a 28-lead exposed QFN lead free package. It is also available as an IP cell. Sample devices and evaluation boards are already available. Volume production will start mid-2005 at a cost of $3 in 10,000 units.

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