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Confidential 1(15)
DESCRIPTION
Document number Revision
1/1551-ROA 128 1044 A
Prepared by Date
LD/SEM/BGURBRR Peter Lorentzon 2004-04-13
Contents responsible if other than preparer Remarks
Reference
Approved by
SEM/BGURBRRC Mikael Nilsson




Technical Description:

RADIO CIRCUITS ON THE TRANSCEIVER BOARD




CONTENTS

1 GENERAL ............................................................................................. 2
1.1 CROSS REFERENCES....................................................................... 2
1.1.1 Names................................................................................................... 2
1.1.2 Abbreviations ........................................................................................ 3
2 CHANGES BETWEEN REVISIONS .................................................... 3
3 OVERVIEW........................................................................................... 4
3.1 THE TX PATH....................................................................................... 4
3.2 THE RX PATH...................................................................................... 5
4 Frequency plan ..................................................................................... 6
5 The radio blocks: .................................................................................. 7
5.1 The antenna switch............................................................................... 7
5.2 The Receiver......................................................................................... 8
5.2.1 RF filter and balun ................................................................................ 8
5.2.2 Receiver front-end ................................................................................ 8
5.2.3 VCO ...................................................................................................... 9
5.2.4 Sigma delta A/D Converter................................................................. 10
5.2.5 Digital filter .......................................................................................... 10
5.3 The transmitter:................................................................................... 11
5.3.1 Frequency synthesis and modulation................................................. 11
5.3.2 Direct modulation and frequency synthesis ....................................... 12
5.3.3 Phase detector.................................................................................... 12
5.3.4 Prescaler............................................................................................. 12
5.3.5 Charge pump and pulse skip detector ............................................... 13
5.3.6 Loop filter ............................................................................................ 13
5.4 Power amplifier & Power control block:.............................................. 14
5.5 The Voltage Controlled X-tal Oscillator (VCXO): ............................... 15
5.6 Power Management............................................................................ 15
6 REFERENCES ................................................................................... 15




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Confidential 2(15)
DESCRIPTION
Document number Revision
1/1551-ROA 128 1044 A


1 GENERAL
This document describes radio solution, which are part of the transceiver board
mounted in the digital GSM pocket phones.

This document is also valid for transceiver board ROA 128 1044 (K700i).

The other part of the transceiver board that carries the base band part is described
in the corresponding document 2/1551