DESCRIPTION
The SA1921 is an integrated dual-band RF front-end that operates at both cellular (AMPS, DAMPS, and GSM) and satellite (1515–1600 MHz) frequencies, and is designed in a 13 GHz fT BiCMOS process—QUBiC1. The low-band is a combined low-noise amplifier (LNA) and mixer. The LNA has a 1.7 dB noise figure at 943 MHz with 18.3 dB of gain and an IIP3 of –5 dBm. The wide-dynamic range mixer has a 11 dB noise figure at 943 MHz with 7.2 dB of gain and an IIP3 of +5 dBm.

FEATURES
• Low current consumption
• Outstanding low- and high-band noise figure
• Excellent gain stability versus temperature and supply
• Image reject high-band mixer with over 30 dB of rejection
• Increased low-band LNA gain compression during analog transmission
• LO input and output buffers
• On chip logic for network selection and power down
• Very small outline package

APPLICATIONS
• 800 to 1000 MHz analog and digital receivers
• 1515 to 1600 MHz digital receivers
• Portable radios
• Digital mobile communications equipment