INTEGRATED CIRCUITS
SA1921 Satellite and cellular dual-band RF front-end
Product specification Supersedes data of 1998 ...
INTEGRATED CIRCUITS
SA1921 Satellite and cellular dual-band RF front-end
Product specification Supersedes data of 1998 Sep 11 IC17 Data Handbook 1999 Mar 02
Philips Semiconductors
Philips Semiconductors
Product specification
Satellite and cellular dual-band RF front-end
SA1921
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 Bi
CMOS 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 LO input and output buffers On chip logic for network selection and power down Very s...