SA1921

General 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 f_T 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.

The high-band contains a receiver front-end, and a high frequency transmit mixer intended for closed loop transmitters. One advantage of the high-band architecture is an image-rejection mixer with over 30 dB of image rejection; thus, eliminating external filter cost while saving board space. The system noise figure is 3.9 dB at 1550 MHz with a power gain of 22.2 dB and an IIP3 of ?11.5 dB.

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

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