SA1921

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

The SA1921 is an integrated dual-band RF front-end that operates at both cellular (AMPS, DAMPS, and GSM) and satellite (15151600 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 SA1921 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 SA1921 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.