SKY74219-21

• Excellent linearity, blocker performance, noise figure, and dynamic range
• Low external component count
• Low power operation
• Closed Polar Loop transmitter and direct conversion receiver
• Simplified control interface with channel number programming
• Four separate LNAs with differential inputs
• Fully integrated programmable VCO/synthesizer

RF Transceiver with Analog I/Q Interface

The SKY74219-21 is a highly integrated transceiver intended for quad-band GSM, GPRS, and EDGE femtocell base stations and cellular repeaters. The receiver consists of four integrated LNAs, a quadrature demodulator, and baseband filters. Skyworks closed Polar Loop transmit architecture maintains traditional analog I/Q signals but autonomously splits amplitude and phase within the device. The filter-saving advantage of the translation-loop approach of SKY74219-21 is embedded in the architecture. Also included is an AM loop that provides both signal AM and power level control.

The SKY74219-21 is intended to be used with the SKY65330 FEM, which contains a switch, PA, and an integrated coupler. Together, the transceiver and FEM form the GSM/EDGE Femto Base Station RF Subsystem.