TITLE

From RF to baseband: Trends at the GSM radio interface

AUTHOR(S)
Levy, Gary
PUB. DATE
December 2004
SOURCE
Portable Design;Dec2004, Vol. 10 Issue 12, p18
SOURCE TYPE
Periodical
DOC. TYPE
Article
ABSTRACT
The article focuses on the developments in the GSM radio interface. Radio partitioning within the GSM handset was dictated predominately by RF design constraints and transceiver integration. As phone buyers pressure handset makers to reduce size and cost while increasing features, the boundaries between the antenna-switch module (ASM), surfaceacoustic-wave (SAW) filters, transceiver, power amplifier (PA) and baseband interface the boundaries are getting blurred. That places a premium on pcb space, bill of materials and performance and presents the handset designer with a wide array of choices at the radio interface. Within the radio subsystem, the transmit signal travels from the transceiver to the PA, where it's routed to the antenna by the antenna switch, which selects between the desired outgoing or incoming RF signal. During the receive operation, the switch directs the incoming signal through the appropriate SAW filter to select the proper frequency band. An input match resides between the SAWs and transceiver. In case of the baseband interface current handsets transfer receive demodulated data and transmit modulated in analog in-phase and quadrature-phase format.
ACCESSION #
15445458

 

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