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This paper presents a quad-band RF transceiver front end module for the applications of wireless services. The proposed quad band RF transceiver front end module is designed to directly interconnect a single multi-resonance antenna to a diplexer, surface acoustic wave band pass filters and duplexers to miniaturize a front end module and to enhance the impedance matching. RF and IF blocks are connected...
This article designs the network transmission project of highway informationization from the choice, the composition, and the mode of the road transmission network, then proposes the security program of information transmission network based on the different security levels of information transmission network.
This paper describes a compact SAW-less receiver front-end design targeting multiband multimode GSM/EDGE/WCDMA/GPS applications. Using a translational loop for input matching, the inductor-free receiver achieves high OOB lin earity and low NF at low power consumption.
In order to ensure the high positioning precision of GPS land survey device and uploading the investigating data to data central real time, the paper analyses the advantages and disadvantages of several wireless communication technique in common use. And a data transmission system used in GPS land survey device is designed and developed based on GPRS. The results of lots of tests and applications...
This work describes the first multiband WCDMA/HSPA/EGPRS single-chip transceiver with GPS and receiver diversity. This device supports UMTS bands 1,2,3,4,5,6,8,9,10 and GSM/EDGE 800, 900, 1800, 1900 MHz bands. It is implemented in cost-effective 0.18 mum RF CMOS technology and uses a reduced number of TX and RX SAW filters.
A systematic system-level design methodology for multiband-multistandard (MB-MS) wideband/reconfigurable CMOS receivers is presented. The methodology determines the specifications (noise figure (NF) and linearity) for each building block to minimize the overall power consumption. System-level simulations show that the gain variation of the LNA for various bands/standards is an important factor in...
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