Dual-Band RF Synthesizer

The Si4133G Dual-Band RF synthesizer is a fast settling integer-N synthesizer. Featuring settling times under 150 microseconds, the synthesizer supports the latest General Packet Radio Services (GPRS) requirements for GSM/DCS1800 mobile phones. This advances next generation mobile computing by enabling wireless data transfer rates that are equivalent to a V.90 modem. Additionally, the single-chip unit is highly integrated and provides reductions in the board space, cost and power required to implement a complete RF synthesizer.

The synthesizer provides a complete CMOS RF synthesizer in a single low-profile, small-outline 24-pin package. It integrates three voltage-controlled oscillators (VCOs), loop filters, reference and VCO dividers and phase detectors, reducing board space requirements by 75 percent. It also features a proprietary self-tuning architecture that does not require VCO modules and provides the ability to achieve the fast settling times required for GPRS. The unit performs RF synthesis in two bands, 900 MHz to 1.8 GHz and 750 MHz to 1.5 GHz, as well as IF synthesis from 62.5 MHz to 1.0 GHz.

Silicon Laboratories, 4635 Boston Lane, Austin, TX 78735 Phone: 512-416-8500 Fax: 512-416-9669