手机rf and baseband design

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【文件名】:06425@52RD_手机rf and baseband design.pdf
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bjohn

An RF to Baseband Design for a PCS1900 Handset
Liam Devlin, Steve Fitz, Geoff Smithson
The authors are with Plextek Ltd, London Road, Great Chesterford,
Essex, CB10 1NY, Engand (+44 1799 533 200)
Abstract
GSM is currently the most widely adopted
digital cellular telephony standard in the
world. This paper presents details of the
design of the RF to baseband section of a
PCS1900 cellular handset. Detailed block
diagrams, circuit descriptions and measured
performance are presented. The radio has been
designed to operate with a baseband
Evaluation Board (EVB) and the performance
of the radio functioning in conjunction with
the baseband, as a complete handset, is
presented. A casework design for the handset
mechanics has also been developed; it includes
an integral patch antenna and allows complete
z-axis assembly to facilitate volume
manufacture.
Introduction
difference between the systems, is the
frequency of operation. This is summarised in
Table 1.
Standard Uplink (Mobile
to BTS)
Downlink (BTS
to Mobile)
GSM900 890-915MHz 935-960MHz
DCS1800 1710-1785MHz 1805-1880MHz
GSM1900 1850-1910MHz 1930-1990MHz
Table 1: Frequency Allocations of GSM
Variants
The radio interface for all three bands is the
same.  Table 2 summarises the main radio
interface parameters of the GSM standard,
additional information can be found in [1].
Multiple Access Method TDMA and FDMA
Channel Spacing 200kHz[em11]

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